Hydrohistorian
Cache La Poudre River
Cache La Poudre River on the ground — the ditches, wells, reservoirs and gages of Water District 3 · clicktap anything for its record
The well-permit cells in view, as a table
Each row is one ~1-mile cell (0.02°) with the permits the file spots inside it, split into water-supply permits and monitoring holes (DWR’s two monitoring categories: drilled to look at the water, not to pump it). These are permits, not wells: a permit is a piece of paper, and the file does not say which were drilled. Spotting is the file’s own, about a mile at best, which is why the cells are no finer.
| Lat | Lon | Water-supply permits | Monitoring holes |
|---|
Browse this district’s ditches, gages, reservoirs, wells and springs as a list.
The Cache La Poudre is critically low for late September -- 18% of normal flow. 3 calls stand against it right now; the most senior right calling dates to 1864. DWR's statements do not settle whether 4 more calls reach it.
Schematic
Historical
Evolution of the network
Trends
Source Our computation, no independent reference · computed here from the screened DWR record Source Our computation, no independent reference · no independent reference; see /methods
This year, in context
In the weeks around 2026-09-27 (the newest reading on file), flows at the 40 ranked gages are running at a median 64% of their own long-term norm for this window — 31 below a typical year, 9 at or above. Driest relative to its record: LARIMER COUNTY #2 @ 12 FT PARSHALL FLUME, ranking 1st lowest of 28 years.
How this comparison is made
Each gage's mean flow over the 3 days either side of 2026-09-27, compared with the same window in every year of its own record — so a gage is only ever measured against itself, and gages with no record in the window are counted out rather than guessed.
Gage flow trend & changepoints
What counts as a trend here
Computed 2026-10-11 19:44 from 66 gage(s) with cached period-of-record data. The series is each gage's annual mean flow in cfsCubic feet per second, a rate of flow. One cfs running for a day is about 2 acre-feet. (years with ≥300 days of record). Mann-Kendall (trend, with the Hamed–Rao correction for serial correlation — persistence can otherwise fake significance) and Pettitt (changepoint) both require at least 8 years spanning at least 10 years of record. A gage below that reports no signal — which is not the same as “no change.” The %-per-decade figure is the same Sen slope divided by the gage's median annual flow, for comparing across streams of very different size; it is omitted for near-ephemeral channels where the median is too small to divide by honestly.
Of the 66 gages with enough record, 5 are trending down and 1 up, and 8 carry a detected shift. The clearest is Cache La Poudre at Canyon Mouth near Fort Collins, its annual mean flow changing -18.66 cfs per decade (-5.0% of its median annual flow) over 140 years (p<0.0001). The other 55 show no clear signal either way. 2 transbasin gages meter imported or exported water — marked ⇆ below and kept out of these counts, because that flow is an operator's decision, not the basin's hydrology (all transbasin diversions).
Drought history, cost, and the four-century context moved to the Drought tab.
| Gage | Trend | Change / decade cfs · % of median annual flow | Significance | Years | Changepoint |
|---|---|---|---|---|---|
|
▸
Cache La Poudre at Canyon Mouth near Fort Collins CLAFTCCO |
↓ decreasing | -18.66 cfs -5.0% | p<0.001 | 140 | ~1938 |
|
▸
Hansen Supply Canal to Cache La Poudre River near Fort Collins HSCCLPCO |
↓ decreasing | -11.12 cfs -11.3% | p<0.001 | 60 | ~1977 |
|
▸
⇆
Grand River Ditch at La Poudre Pass GRNDRDCO |
↓ decreasing | -1.73 cfs -6.7% | p=0.002 | 83 | ~1964 |
|
▸
⚠️
⇆
Michigan Ditch at Cameron Pass MICDCPCO |
↑ increasing | +0.66 cfs +21.5% | p=0.007 | 78 | ~1986 |
|
▸
Canal # 3 near Greeley CANAL3CO |
↓ decreasing | -3.29 cfs -11.4% | p=0.007 | 21 | — |
|
▸
Cache La Poudre River near Rustic CLARUSCO |
↓ decreasing | -190.82 cfs -65.9% | p=0.013 | 11 | ~1962 |
|
▸
Cache La Poudre near Greeley CLAGRECO |
↑ increasing | +8.06 cfs +7.3% | p=0.014 | 109 | ~1969 |
|
▸
Munroe Canal MUNCANCO |
↓ decreasing | -1.90 cfs -3.7% | p=0.039 | 54 | ~1976 |
|
▸
⚠️
Hansen Fdr Can at T.O. to Cottonwood Cr. near Ni HFCCCRCO |
no clear trend | +0.00 cfs | p=0.116 | 45 | ~1964 |
|
▸
Ft. Col. Ca. at Cache La Poudre River near CLACANCO |
no clear trend | +1.66 cfs +11.4% | p=0.118 | 18 | ~1973 |
|
▸
Bobcreek Ditch near Deadman Mountain, near Glendevey BOBGLNCO |
no clear trend | +0.00 cfs | p=0.161 | 76 | ~1997 |
⚠️ 2 gages flagged: their records may have quietly shifted against their neighbours, so treat their trends with caution.
How drift is detected
Every gage's annual flows are compared against each neighbour's as a double-mass curve (Searcy & Hardison, USGS WSP 1541-B); a Pettitt step test looks for a break in the ratio. A gage is flagged only when the breaks AGREE across its references, and a break against an already-suspect gage is never counted against a healthy one. A double-mass break means the ratio between two gages changed, not that either gage is faulty: a new diversion, a reservoir, or an import changes that ratio exactly as a rating shift does. Screening aid for expert review, never a measurement verdict.
55 other gage(s) show no significant trend or changepoint (not shown).
How the measurement network itself changed
This basin was not always measured the way it is today — the API-era record is dense and recent, the early record sparse. 45 gage(s) and 134 structure(s) report in 2026, but structure reporting only reached half its modern level around ~1982. Every historical claim below is checked against this: long-term shifts that co-move with the growth of the network carry an explicit measurement-evolution caution, and abandonment screens whose idleness begins before the modern reporting era are flagged †.
| Decade | Gages with data (median yr) | Structures reporting (median yr) |
|---|---|---|
| 1880s | 1 | 0 |
| 1890s | 1 | 0 |
| 1900s | 1 | 0 |
| 1910s | 2 | 0 |
| 1920s | 2 | 0 |
| 1930s | 4 | 0 |
| 1940s | 6 | 0 |
| 1950s | 12 | 26 |
| 1960s | 16 | 28 |
| 1970s | 16 | 77 |
| 1980s | 16 | 100 |
| 1990s | 14 | 102 |
| 2000s | 22 | 132 |
| 2010s | 28 | 164 |
| 2020s | 44 | 148 |
Mass-balance (network closure) trend
Structure divrec-history backfill coverage as of the last check: 4% of 3684 schematic-relevant structures. 0 year(s) clear the 30% coverage gate so far -- the trend activates automatically once qualifying years span a full decade. No action needed; the nightly backfill keeps extending the record.
Reach gain/loss shifts (1950–2026)
Mass-balance kinks computed for every summer month back to 1950 (4211 reach-snapshots) — which reaches gain or lose water, and how that has shifted across decades. Each shift is cross-checked against the observation record above: as more diversions became metered, "unaccounted" water shrinks mechanically, which can masquerade as a hydrologic shift.
- LARIMER AND WELD IRRIGATION COMPANY @ 30 FT PARSHALL FLUME: reach shifted from +13 cfs to +202 cfs summer mean (more gaining, p=0.003, 32 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization]
- NORTH POUDRE CANAL: reach shifted from +6 cfs to +15 cfs summer mean (more gaining, p=0.043, 11 yr) [crystalline foothills: minimal groundwater storage -- large or shifting unaccounted losses here are more consistent with data/measurement issues or unmodeled plumbing than with aquifer exchange] [measurement-evolution caution: this shift co-moves with the growth of the gage/metering network (rho=-0.47) -- part of it may be unaccounted water becoming accounted, not hydrologic change]
- LARIMER COUNTY #2 @ 12 FT PARSHALL FLUME: reach shifted from -189 cfs to +1 cfs summer mean (more gaining, p=0.000, 28 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization]
- CACHE LA POUDRE RIVER BELOW NEW CACHE: reach shifted from -88 cfs to +189 cfs summer mean (more gaining, p=0.001, 32 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization] [30 alluvial wells within 2 mi of the gage; pooled water table -0.4 ft (1941–1992, no_trend)]
- CACHE LA POUDRE RIVER AT FORT COLLINS, CO: reach shifted from +461 cfs to +84 cfs summer mean (more losing, p=0.009, 52 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization]
- CANAL # 3 NEAR GREELEY: reach shifted from -84 cfs to +44 cfs summer mean (more gaining, p=0.001, 30 yr) [sedimentary plains/foothills: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records] [30 alluvial wells within 2 mi of the gage; pooled water table +0.1 ft (1941–1992, no_trend)]
Groundwater now has its own tab: 1027 monitored well(s), water-table trends, stream corridors, and the advisory depletion screen.
Reservoirs now has its own tab: 117 reservoir(s), end-of-year storage back to 1950, click-to-chart histories.
Cross-gage pattern fingerprint
Over the 52-year window with full coverage (1975–2026), the dominant shared pattern across 3 gage(s) explains 92% of year-to-year variance (almost certainly a basin-wide climate/snowpack driver).
All gages in this window move with the shared pattern -- no localized outlier.
Structures most implicated by reconciliation (as of 2026-09-27)
Which structures' data absorbed the most correction when the current mass-balance snapshot was reconciled -- see the Historical tab for the full picture on any date.
- WESTERN SUGAR 120 RESERVOIR CELL B (diversion): +2.7 cfs (8% of that reach's correction)
- ASH PAD EXTRACTION DIVERSION (diversion): +2.7 cfs (8% of that reach's correction)
- OGILVY DITCH (diversion): +2.7 cfs (8% of that reach's correction)
- OGILVY RETURN STRUCTURE (return): +2.7 cfs (8% of that reach's correction)
- OGILVY D CENTRAL AUG RETURN (return): +2.7 cfs (8% of that reach's correction)
- LOLOFF SEC 4 DITCH (diversion): +2.7 cfs (8% of that reach's correction)
- GREELEY E 8TH STREET RESERVOIR (diversion): +2.7 cfs (8% of that reach's correction)
- LOLOFF RESERVOIR (diversion): +2.7 cfs (8% of that reach's correction)
- DERR PIT RESERVOIR (diversion): +2.7 cfs (8% of that reach's correction)
- LINN GROVE CEMETERY POND 2 (diversion): +2.7 cfs (8% of that reach's correction)
Data provenance & quality
Where these numbers come from and how far they can be trusted. Grade C (3/6 points) — the components below are the finding; the letter alone is not. Sources: DWR HydroBase snapshot HydroBase_CO_20260928 (imported 2026-10-04) for history, plus the CDSS REST API for current conditions.
| Check | State | What was measured |
|---|---|---|
| gage freshness | stale | newest gage reading is 14 day(s) old (target 7) |
| diversion record | expected-lag | newest diversion record is 346 day(s) old (DWR publishes ~1 year in arrears) |
| structure coverage | sparse | 4% of schematic structures have data |
Independent check: PASS — 100.0000% agreement across 15,052 stored values re-checked against DWR's authoritative record (HydroBase_CO_20260707), over 20 structures. 0 disagreement(s) beyond a 0.01 cfs tolerance. Checked 2026-08-19; a rotating sample covers the whole basin across successive runs, and the structures this report cites are checked every time.
Federal cross-check: PASS — 99.58% day-level agreement with USGS's own published records for the same gages, across 19 co-listed station(s) and 196,848 overlapping days (within max(2%, 0.5 cfs) daily). Pre-1950 records at some gages carry known between-agency day-stamp and transcription differences — scored at each year's best ±1-day alignment; residual disagreement is real historical divergence, flagged for review.
66 gage(s) / 662,982 daily values (1881-07-01–2026-09-27); 358 structure(s) with diversion records; 2964 with decreed rights. Methodology has not yet had independent expert review — treat every figure as an advisory screen, not an administrative or legal conclusion.
Groundwater
Source DWR administrative record · verify at DWR groundwater wells ↗ Source DWR administrative record · verify at DWR well permits ↗
11,529 water-level measurements across 1027 monitored well(s) — 913 alluvial, 4 bedrock — plus 4 administered well(s) reporting metered pumping.
What is being counted
Observation wells and pumping wells are different populations and are never conflated: water levels come from monitored observation wells, and metered pumping comes from administered wells reporting through diversion records. Click any well to chart its own record.
Well map
3D aquifer x-ray
Every aquifer unit as its own head surface, animated through time.
How the surfaces are built, and what they are not
Alluvial water table on top, Denver Basin members (Dawson, Denver, Arapahoe, Laramie–Fox Hills) stacked beneath where measured, interpolated from measured water levels. Units are never mixed; a surface exists only inside its own unit's well coverage, with no extrapolation; thin epochs are suppressed and say why. Vertical scale is exaggerated for readability and z is head elevation in feet. These are measured heads, not a calibrated groundwater model.
Water-table trends
Of 49 well(s) with enough record for a trend test: 9 declining, 3 rising.
| Fastest-declining wells | Setting | ft / decade | Span | p |
|---|---|---|---|---|
| ▸ 83-1 | alluvial | -8.03 | 17 yr | 0.0022 |
| ▸ 110-3 | alluvial | -2.03 | 17 yr | 0.0049 |
| ▸ SB00906834ABB | alluvial | -1.94 | 20 yr | 0.004 |
| ▸ SB00806827CBB2 | alluvial | -0.83 | 30 yr | 0.0165 |
| ▸ SB00706614AAB | alluvial | -0.82 | 55 yr | 0.0413 |
| ▸ LSP-062 06N6712BBB | alluvial | -0.66 | 85 yr | 0.0001 |
| ▸ SB00606812AAA | alluvial | -0.52 | 17 yr | 0.0001 |
| ▸ LSP-061 06N6517BBC | alluvial | -0.42 | 93 yr | 0.0419 |
Stream corridors — the surface connection
Where a reach's gain or loss has shifted, the wells within two miles of its anchoring gage and what their water table did over the same era.
How the corridor is assembled
For each reach whose gain/loss has shifted (Trends tab): the wells within 2 miles of its anchoring gage, their pooled water-table history over the same era, and an advisory Glover screen of lagged stream depletion from nearby metered pumping. v1 proximity = distance to the reach's anchoring gage; segment-based reach join is a flagged upgrade.
LARIMER AND WELD IRRIGATION COMPANY @ 30 FT PARSHALL FLUME: 19 alluvial well(s) nearby
LARIMER COUNTY #2 @ 12 FT PARSHALL FLUME: 7 alluvial well(s) nearby
CACHE LA POUDRE RIVER BELOW NEW CACHE: 30 alluvial well(s) nearby; pooled water table -0.4 ft (1941–1992, no_trend, p=0.2946). Glover screen: 0.4 cfs of nearby metered alluvial pumping → est. lagged depletion 0.2–0.4 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).
CACHE LA POUDRE RIVER AT FORT COLLINS, CO: 15 alluvial well(s) nearby
CANAL # 3 NEAR GREELEY: 30 alluvial well(s) nearby; pooled water table +0.1 ft (1941–1992, no_trend, p=0.6315). Glover screen: 0.1 cfs of nearby metered alluvial pumping → est. lagged depletion 0.1–0.1 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).
LITTLE CACHE LA POUDRE DITCH: 10 alluvial well(s) nearby
Wells labeled by administrative world before anything else is said about them: tributary alluvium participates in the priority system; designated-basin and Denver Basin bedrock aquifers are governed differently and are excluded from stream-connection reasoning. Read bedrock declines differently too: deep bedrock aquifers recharge negligibly on human timescales, so a falling bedrock level is storage mining — effectively permanent — not a drought response that a wet year undoes. All screens advisory.
58% are constructed wells; 12% tie to a decreed structure. A permit is permission to drill, not a water right; most here are exempt household wells. More in three things called “well”, or turn on the Well permits chip on the map above to see where they sit.
Permits issued here, by year
10,489 located water-supply permits with an issue date, 1900 to 2026; half of them had been issued by 1994, and the busiest year was 1960 with 398. The district’s 3,761 monitoring holes are counted apart: they are drilled to look, not to pump. A permit is not a well, and the year is the date the paper was issued, not a drilling date. The 18,074 above counts every permit on file here; 3,824 of them have no usable location or no issue date and are not in this chart.
water-supply permits issued that year monitoring holes, when shown 4 issued before 1950 are in the table, not the bars
The counts by year, as a table
| Year | Issued | Monitoring holes | Water-supply | Issued through that year |
|---|---|---|---|---|
| 1900 | 1 | 0 | 1 | 1 |
| 1911 | 1 | 0 | 1 | 2 |
| 1919 | 1 | 0 | 1 | 3 |
| 1945 | 1 | 0 | 1 | 4 |
| 1950 | 1 | 0 | 1 | 5 |
| 1953 | 28 | 0 | 28 | 33 |
| 1954 | 92 | 0 | 92 | 125 |
| 1955 | 122 | 0 | 122 | 247 |
| 1956 | 70 | 0 | 70 | 317 |
| 1957 | 77 | 0 | 77 | 394 |
| 1958 | 81 | 0 | 81 | 475 |
| 1959 | 109 | 0 | 109 | 584 |
| 1960 | 398 | 0 | 398 | 982 |
| 1961 | 45 | 0 | 45 | 1,027 |
| 1962 | 44 | 0 | 44 | 1,071 |
| 1963 | 55 | 0 | 55 | 1,126 |
| 1964 | 58 | 0 | 58 | 1,184 |
| 1965 | 76 | 0 | 76 | 1,260 |
| 1966 | 61 | 0 | 61 | 1,321 |
| 1967 | 50 | 0 | 50 | 1,371 |
| 1968 | 43 | 0 | 43 | 1,414 |
| 1969 | 40 | 0 | 40 | 1,454 |
| 1970 | 38 | 0 | 38 | 1,492 |
| 1971 | 85 | 0 | 85 | 1,577 |
| 1972 | 360 | 0 | 360 | 1,937 |
| 1973 | 167 | 0 | 167 | 2,104 |
| 1974 | 106 | 0 | 106 | 2,210 |
| 1975 | 101 | 0 | 101 | 2,311 |
| 1976 | 86 | 1 | 85 | 2,397 |
| 1977 | 168 | 0 | 168 | 2,565 |
| 1978 | 279 | 0 | 279 | 2,844 |
| 1979 | 175 | 0 | 175 | 3,019 |
| 1980 | 162 | 0 | 162 | 3,181 |
| 1981 | 178 | 1 | 177 | 3,359 |
| 1982 | 151 | 1 | 150 | 3,510 |
| 1983 | 150 | 0 | 150 | 3,660 |
| 1984 | 113 | 1 | 112 | 3,773 |
| 1985 | 136 | 0 | 136 | 3,909 |
| 1986 | 113 | 3 | 110 | 4,022 |
| 1987 | 161 | 10 | 151 | 4,183 |
| 1988 | 163 | 38 | 125 | 4,346 |
| 1989 | 215 | 54 | 161 | 4,561 |
| 1990 | 210 | 84 | 126 | 4,771 |
| 1991 | 207 | 66 | 141 | 4,978 |
| 1992 | 204 | 58 | 146 | 5,182 |
| 1993 | 297 | 99 | 198 | 5,479 |
| 1994 | 369 | 99 | 270 | 5,848 |
| 1995 | 351 | 86 | 265 | 6,199 |
| 1996 | 316 | 89 | 227 | 6,515 |
| 1997 | 334 | 61 | 273 | 6,849 |
| 1998 | 348 | 107 | 241 | 7,197 |
| 1999 | 385 | 130 | 255 | 7,582 |
| 2000 | 367 | 66 | 301 | 7,949 |
| 2001 | 304 | 61 | 243 | 8,253 |
| 2002 | 388 | 91 | 297 | 8,641 |
| 2003 | 377 | 108 | 269 | 9,018 |
| 2004 | 260 | 78 | 182 | 9,278 |
| 2005 | 257 | 65 | 192 | 9,535 |
| 2006 | 256 | 80 | 176 | 9,791 |
| 2007 | 244 | 68 | 176 | 10,035 |
| 2008 | 252 | 97 | 155 | 10,287 |
| 2009 | 140 | 61 | 79 | 10,427 |
| 2010 | 177 | 93 | 84 | 10,604 |
| 2011 | 132 | 51 | 81 | 10,736 |
| 2012 | 117 | 25 | 92 | 10,853 |
| 2013 | 133 | 51 | 82 | 10,986 |
| 2014 | 205 | 127 | 78 | 11,191 |
| 2015 | 268 | 160 | 108 | 11,459 |
| 2016 | 260 | 153 | 107 | 11,719 |
| 2017 | 273 | 152 | 121 | 11,992 |
| 2018 | 296 | 171 | 125 | 12,288 |
| 2019 | 338 | 216 | 122 | 12,626 |
| 2020 | 269 | 147 | 122 | 12,895 |
| 2021 | 276 | 133 | 143 | 13,171 |
| 2022 | 247 | 87 | 160 | 13,418 |
| 2023 | 252 | 125 | 127 | 13,670 |
| 2024 | 171 | 51 | 120 | 13,841 |
| 2025 | 287 | 203 | 84 | 14,128 |
| 2026 | 122 | 53 | 69 | 14,250 |
Every district in the file on one scale · the whole file, one year at a time · Plate 4 of the Driller’s Atlas.
What drillers reached, township by township
44 PLSS townships here where at least 5 water-supply permits naming the same aquifer filed a depth (9,815 permits in all; the 24 most-drilled are drawn, every one is in the table). Each column is one township, six miles square, on one scale to 800 ft below ground: a faint lane spans the 10th to 90th percentile of where the permits naming that aquifer stopped, the solid band their screens, the tick the median. This is the permit file’s view of the ground — the aquifer is the name the driller wrote, the band is where those holes ended — not a geologic map, and a township is as fine as it gets. Monitoring holes are left out. 10 of these townships straddle a district line and are filed here because most of their permits are.
863
656
653
625
596 · 59% here
569
534
462
398 · 70% here
341 · 92% here
301
298 · 65% here
267
267
262 · 86% here
251
203 · 58% here
198 · 53% here
191
176
170
124
117
111
unnamed alluvium Laramie-Fox Hills fractured crystalline other named faint = where the permits naming it stopped (10th–90th pct) · solid = their screens · tick = median · ft below ground as filed
Every township here, as a table
| Township | Share of its permits in this district | Aquifer named | Permits with a depth | Drilled depth p10 / p50 / p90, ft | Screen top p10 / p50 / p90, ft | Screen bottom p10 / p50 / p90, ft |
|---|---|---|---|---|---|---|
| T10N R73W 6th PM | 100% | unnamed | 855 | 50 / 202 / 500 | 30 / 130 / 380 | 80 / 222 / 500 |
| T10N R73W 6th PM | 100% | fractured crystalline | 7 | 349 / 500 / 740 | 220 / 360 / 530 | 332 / 485 / 590 |
| T7N R68W 6th PM | 99% | alluvium | 18 | 15 / 24 / 49 | 14 / 26 / 31 | 21 / 40 / 45 |
| T7N R68W 6th PM | 99% | unnamed | 637 | 16 / 30 / 60 | 8 / 20 / 40 | 20 / 35 / 61 |
| T9N R72W 6th PM | 100% | unnamed | 638 | 184 / 418 / 660 | 58 / 300 / 540 | 200 / 400 / 617 |
| T9N R72W 6th PM | 100% | fractured crystalline | 12 | 370 / 632 / 800 | 200 / 440 / 645 | 308 / 572 / 775 |
| T7N R69W 6th PM | 99% | unnamed | 623 | 19 / 37 / 272 | 10 / 23 / 180 | 23 / 42 / 330 |
| T6N R65W 6th PM | 59% | alluvium | 19 | 54 / 63 / 92 | 31 / 34 / 46 | 51 / 62 / 86 |
| T6N R65W 6th PM | 59% | unnamed | 569 | 35 / 64 / 250 | 18 / 44 / 120 | 35 / 65 / 256 |
| T6N R65W 6th PM | 59% | Laramie-Fox Hills | 7 | 176 / 205 / 477 | 80 / 138 / 236 | 158 / 200 / 338 |
| T6N R67W 6th PM | 99% | unnamed | 550 | 20 / 31 / 43 | 10 / 18 / 26 | 24 / 32 / 40 |
| T6N R67W 6th PM | 99% | alluvium | 19 | 28 / 36 / 40 | 12 / 20 / 30 | 30 / 35 / 40 |
| T10N R74W 6th PM | 100% | unnamed | 519 | 105 / 360 / 600 | 60 / 220 / 440 | 105 / 329 / 540 |
| T10N R74W 6th PM | 100% | fractured crystalline | 14 | 332 / 650 / 800 | 212 / 525 / 684 | 374 / 585 / 744 |
| T8N R69W 6th PM | 99% | unnamed | 460 | 15 / 60 / 321 | 10 / 80 / 367 | 18 / 144 / 500 |
| T7N R66W 6th PM | 70% | alluvium | 9 | 38 / 48 / 122 | 20 / 29 / 107 | 34 / 43 / 151 |
| T7N R66W 6th PM | 70% | unnamed | 387 | 30 / 50 / 250 | 18 / 35 / 260 | 34 / 52 / 410 |
| T8N R70W 6th PM | 92% | unnamed | 338 | 35 / 238 / 620 | 28 / 190 / 501 | 98 / 345 / 620 |
| T8N R68W 6th PM | 100% | unnamed | 297 | 30 / 57 / 203 | 19 / 38 / 229 | 36 / 64 / 390 |
| T9N R67W 6th PM | 65% | unnamed | 285 | 297 / 580 / 740 | 180 / 400 / 640 | 320 / 600 / 740 |
| T9N R67W 6th PM | 65% | Laramie-Fox Hills | 11 | 255 / 700 / 780 | 250 / 580 / 664 | 332 / 690 / 760 |
| T6N R66W 6th PM | 96% | unnamed | 258 | 22 / 42 / 219 | 11 / 25 / 73 | 26 / 44 / 212 |
| T6N R66W 6th PM | 96% | alluvium | 7 | 34 / 45 / 58 | 19 / 25 / 33 | 32 / 42 / 55 |
| T9N R68W 6th PM | 99% | unnamed | 262 | 28 / 62 / 600 | 14 / 42 / 480 | 30 / 70 / 624 |
| T8N R71W 6th PM | 86% | unnamed | 252 | 20 / 240 / 600 | 30 / 178 / 480 | 68 / 318 / 600 |
| T8N R71W 6th PM | 86% | fractured crystalline | 8 | 512 / 700 / 800 | — | — |
| T9N R73W 6th PM | 100% | unnamed | 242 | 22 / 75 / 359 | 20 / 45 / 260 | 36 / 80 / 376 |
| T9N R73W 6th PM | 100% | fractured crystalline | 5 | 42 / 80 / 792 | — | — |
| T6N R69W 6th PM | 58% | unnamed | 201 | 50 / 300 / 700 | 27 / 285 / 600 | 91 / 400 / 700 |
| T5N R66W 6th PM | 53% | unnamed | 196 | 20 / 43 / 240 | 7 / 20 / 88 | 22 / 30 / 198 |
| T9N R69W 6th PM | 100% | unnamed | 190 | 24 / 47 / 441 | 13 / 30 / 400 | 30 / 75 / 500 |
| T7N R67W 6th PM | 98% | unnamed | 173 | 25 / 75 / 500 | 14 / 45 / 350 | 26 / 92 / 680 |
| T8N R67W 6th PM | 96% | unnamed | 156 | 93 / 413 / 732 | 68 / 290 / 600 | 123 / 400 / 710 |
| T8N R67W 6th PM | 96% | Laramie-Fox Hills | 6 | 340 / 440 / 674 | 140 / 200 / 412 | 302 / 390 / 536 |
| T8N R67W 6th PM | 96% | other named | 5 | 432 / 540 / 780 | — | — |
| T10N R68W 6th PM | 98% | unnamed | 119 | 42 / 520 / 800 | 100 / 380 / 662 | 229 / 520 / 772 |
| T9N R70W 6th PM | 100% | unnamed | 116 | 162 / 440 / 700 | 64 / 280 / 540 | 160 / 425 / 682 |
| T10N R72W 6th PM | 99% | unnamed | 105 | 162 / 425 / 612 | 97 / 310 / 492 | 165 / 400 / 584 |
| T10N R72W 6th PM | 99% | fractured crystalline | 6 | 400 / 550 / 650 | 325 / 490 / 590 | 385 / 550 / 650 |
| T9N R71W 6th PM | 99% | unnamed | 104 | 95 / 440 / 660 | 40 / 240 / 524 | 121 / 390 / 600 |
| T10N R70W 6th PM | 99% | unnamed | 98 | 62 / 268 / 600 | 81 / 215 / 508 | 128 / 300 / 598 |
| T10N R69W 6th PM | 100% | unnamed | 94 | 30 / 95 / 584 | 20 / 60 / 500 | 34 / 200 / 600 |
| T6N R68W 6th PM | 88% | unnamed | 92 | 16 / 30 / 300 | 2 / 15 / 25 | 15 / 28 / 39 |
| T12N R70W 6th PM | 98% | unnamed | 83 | 100 / 300 / 500 | 50 / 215 / 380 | 120 / 302 / 500 |
| T11N R72W 6th PM | 99% | unnamed | 79 | 125 / 400 / 600 | 86 / 305 / 484 | 125 / 400 / 600 |
| T7N R73W 6th PM | 96% | unnamed | 78 | 36 / 152 / 530 | 9 / 68 / 249 | 56 / 152 / 355 |
| T10N R71W 6th PM | 99% | unnamed | 76 | 112 / 450 / 610 | 40 / 340 / 540 | 122 / 435 / 610 |
| T11N R70W 6th PM | 99% | unnamed | 62 | 205 / 440 / 618 | 168 / 350 / 544 | 277 / 420 / 622 |
| T11N R69W 6th PM | 100% | unnamed | 60 | 26 / 106 / 800 | 17 / 40 / 482 | 30 / 150 / 773 |
| T9N R74W 6th PM | 100% | unnamed | 56 | 22 / 63 / 190 | 27 / 51 / 144 | 39 / 80 / 256 |
| T11N R68W 6th PM | 61% | unnamed | 52 | 24 / 60 / 390 | 25 / 55 / 176 | 41 / 90 / 229 |
| T11N R71W 6th PM | 100% | unnamed | 47 | 65 / 400 / 628 | 65 / 300 / 622 | 216 / 482 / 682 |
| T11N R73W 6th PM | 100% | unnamed | 40 | 280 / 400 / 664 | 140 / 320 / 549 | 258 / 392 / 618 |
| T12N R72W 6th PM | 98% | unnamed | 36 | 190 / 440 / 600 | 146 / 282 / 495 | 206 / 400 / 600 |
| T12N R71W 6th PM | 100% | unnamed | 35 | 200 / 400 / 560 | 88 / 290 / 484 | 200 / 390 / 560 |
| T8N R75W 6th PM | 88% | unnamed | 24 | 22 / 46 / 75 | 24 / 38 / 56 | 35 / 59 / 70 |
| T9N R75W 6th PM | 100% | unnamed | 20 | 15 / 40 / 60 | 20 / 30 / 50 | 35 / 45 / 63 |
| T8N R72W 6th PM | 100% | unnamed | 9 | 60 / 125 / 299 | 30 / 55 / 112 | 98 / 152 / 287 |
| T8N R74W 6th PM | 100% | unnamed | 7 | 24 / 30 / 65 | 14 / 21 / 26 | 22 / 30 / 34 |
These columns on the map · Plate 6 of the Driller’s Atlas.
The Driller’s Atlas · Plate 2 A cross-section nobody surveyed
Every permitted well within a few miles of the line, drawn from the ground to its drilled depth as the driller filed it. The bright part of each stroke is the perforated casing — where the well actually takes water — coloured by the aquifer named on the permit. Nobody arranged these; the aquifers arrange themselves.
The ground each well hangs from is a 1-km elevation model sampled at the point the permit was spotted, so the profile is real topography smoothed to about a kilometre — peaks are shaved, valleys filled a little — and the depths are the driller’s, measured down from that ground.
Hover or arrow through the strokes to read a well.
The same corridor as a table
| Miles from A | Wells drawn | Median depth (ft) | With a screen | Most-named aquifer | No depth filed | Ground, ft above sea level (median) |
|---|
Bins run from end A to end B of the line. “Most-named aquifer” is the family most often named on permits in the bin, with its count; permits naming no aquifer are the majority of the file and are not a family.
Reservoirs
Source DWR administrative record · verify at DWR structure records ↗
117 reservoir(s) with 64,377 storage measurement(s), 1950–2026. Basin storage as of 2025-10-31 (the record's own end — reservoir records publish ~annually): 107,278 AF across 95 reservoir(s).
Why storage matters to the flow network
Storage change is real water the mass balance must credit — a losing reach beside a filling reservoir isn't losing water, it's banking it.
Reservoir map — how full is each vessel?
What “full” is measured against
Bubble size is proportional to a reservoir's record-high storage. Fill is its last recorded storage as a share of its surveyed capacity (USACE National Inventory of Dams) where a confident NID match exists — the tooltip names the matched dam — and as a share of its own record high otherwise. A wrong capacity would be worse than an honest record high, so only confident joins upgrade.
A dashed teal ring marks reservoirs reporting live DWR telemetry: their fill reflects yesterday's storage, is drawn as a dotted tail on charts, and is treated as provisional until the next verified HydroBase snapshot supersedes it.
A dashed red ring marks a dam under an active storage restriction from DWR's Dam Safety branch — the State Engineer has limited how much it may legally store, so a low fill can be an order, not a drought. Hazard class and inspection condition come from the same record, joined only where the dam carries this reservoir's WDID or a confident NID match — a wrong dam's restriction would be worse than none shown.
Basin storage, end of each water year
End-of-water-year totals; per-year reservoir counts shown because reporting coverage varies -- a total is only comparable to years with similar counts.
Largest reservoirs on record
Click a row to chart its full storage history, or open its dossier for rights, documents and dam-safety facts.
| Reservoir | Last recorded storage (AF) | As of | Full | Dam (DWR Dam Safety) | |
|---|---|---|---|---|---|
| ▸ UNNAMED IRR A COL PONDS (0303734) | 95,723 | 1973-11-01 | — | — | dossier → |
| ▸ COBB LAKE RES (0303730) | 15,910 | 2025-10-31 | — | — | dossier → |
| ▸ WINDSOR RES (0303738) | 7,991 | 2025-10-31 | — | — | dossier → |
| ▸ RIST CANON RES (0303812) | 6,428 | 1986-05-31 | — | — | dossier → |
| ▸ RES NO 8 (0303727) | 6,137 | 2025-10-31 | — | — | dossier → |
| ▸ PARK CREEK RES 1 (0303752) | 5,630 | 1971-11-01 | — | — | dossier → |
| ▸ MILTON SEAMAN RESERVOIR (0303713) | 5,008 | 2025-10-31 | — | — | dossier → |
| ▸ BLACK HOLLOW RES (0303744) | 4,892 | 2025-10-31 | — | — | dossier → |
Snow and runoff
Source Independent agency measurement · fetched 2026-10-12 · verify at NRCS report generator ↗ Source Our computation, scored against a reference · NRCS forecast, graded here against the gage record
Snow-water equivalent, WY2027
| SNOTEL site | Elev (ft) | SWE (in) | Median (in) | % of median | Typical peak |
|---|---|---|---|---|---|
| Black Mountain | 8940 | 0.1 | 0.0 | — | April 17 (12.5 in) |
| Deadman Hill | 10240 | 0.1 | 0.6 | — | May 4 (21.8 in) |
| Hourglass Lake | 9380 | 0.0 | 0.2 | — | April 19 (13.0 in) |
| Long Draw Resv | 9980 | 0.0 | 0.4 | — | April 27 (18.3 in) |
NRCS SNOTEL, daily. Sites are assigned to the district whose boundary contains them — the snow that feeds this district can also sit in a neighboring headwater district.
Two ways a snow year goes wrong (1979–2026)
A bad snow year here comes in two flavors (both called snow droughtA winter that shorts the snowpack. It happens two ways: a dry one, where the snow never comes, and a warm one, where near-normal snow falls but melts off weeks early -- and the river feels them differently.), and the river feels them differently. In 8 of the last 48 winters the snow never came — the pack peaked below 80% of its median. In 1 more, the snow came but left early — a near-normal peak melted out two weeks or more ahead of its usual date, sending the water down before the season needed it.
The snow never came: 1981, 1987, 2001, 2002, 2004, 2006, 2007, 2026. The snow left early: 2012.
Computed by this site from 4 SNOTEL sites’ full daily records (NRCS AWDB, back to 1979). Each year is measured against each site’s own multi-decade median — not the 1991–2020 normal the chart above uses — so the 1980s grade against a fair baseline. Peak and melt-out need 85% of the season’s days on the record; thin years are dropped, not guessed. Derived from snow measurements alone — it cannot tell dry-from-warm causes apart, only what the snowpack did.
Runoff outlook — Cache La Poudre R at Canyon Mouth
NRCS's final issue (2026-06-01) calls it even odds that at least 87 kAF arrives over 06-01 to 09-30 — 51% of a normal season; almost certainly at least 68, probably not more than 110. Our own record at this gage shows 66 kAF actually delivered. New forecasts begin in January. How to read these numbers →
We test a record-based adjustment of the April benchmark at every graded point. Here it did not beat NRCS over 96 replayed seasons (27% typical miss unadjusted vs 30% adjusted), so none is shown — NRCS’s own forecast, unadjusted, is the best April benchmark available for this river. Why we test →
| 90% chance of at least | 70% chance of at least | 50% chance of at least | 30% chance of at least | 10% chance of at least | Normal | Observed |
|---|---|---|---|---|---|---|
| 68 | 79 | 87 | 96 | 110 | 169 | 66 |
How good are these forecasts here? (1950–2025)
Grading every April issue against what the river then delivered, measured at this gage’s own record — 75 seasons: the median miss of the 50% forecast is 29%, with a high bias of 5%, and the observed volume landed inside the stated 10–90% band 72% of the time (a calibrated forecast would say 80%).
Computed by this site: NRCS's archived April issues (their period as issued each year) against the observed volume in DWR’s published record; years with under 90% daily coverage are dropped, not summed. A grade of the forecast, never of the forecasters — these are hard rivers. How this point ranks among every graded Colorado forecast point →
What April snow has meant for this river (1979–2026)
Across 48 measured years, the season’s water has closely followed the April snowpack: a year opening April with 80% of median snow has typically gone on to deliver about 46% of a normal season (a snow-to-runoff elasticityHow strongly one number moves with another. A snow-to-runoff elasticity of 1.5 means a 10% shortfall in April snowpack has typically become a 15% shortfall in the season's water. of 1.4). In warm, early-melt years the river delivered a median of 25% of a normal season, against 65% in typical years — the timing of the melt matters, not just its size.
Computed by this site: the district’s April 1 SWE (% of each SNOTEL site’s own-record median) against the observed April–July volume at this gage (% of its median season) — a fixed window every year, unlike the forecast grades above, which use each issue’s own period. The slope is fit so single wild years can’t steer it (Theil–Sen, log space); years missing 10% of their days are dropped.
Drought
Source Our computation, no independent reference · computed here from the screened DWR record Source Independent agency measurement · fetched 2026-10-06 · verify at U.S. Drought Monitor ↗
Right now
This is the 26th-driest week 39 in 143 years of record at CACHE LA POUDRE AT CANYON MOUTH NEAR FORT COLLINS (as of 2026-09-21; this week’s flow sits at the 18th percentileRank against the record: a river at its 5th percentile is lower than it was in 95 of the past 100 years on this same date. for the date). On this week’s US Drought Monitor, Weld County is 7% in D4 exceptional drought (2026-10-06).
Every year since 1881, week by week
Each thin row is a year at CACHE LA POUDRE AT CANYON MOUTH NEAR FORT COLLINS; each cell is one week’s flow ranked against the same calendar week of every other year — warm means dry for the date, blue wet, so seasonality cancels and droughts appear as warm bands. Gaps are missing record, never a dry river. Click a year to reconstruct it on the Historical tab.
This year against its analogs
Over the 39 weeks recorded so far, 2026’s weekly trace most resembles 2012 (mean gap 12.4 percentile points; next closest 2020 (17.5), 2007 (18.4)). The analog’s remainder is drawn as context — its ending is what happened to it, not a forecast for this year.
The Drought Monitor’s view since 2000
Mean share of area in each class across Larimer, Larimer, Weld counties — the counties this district’s gages sit in, which overlap the district imperfectly. The Drought Monitor weighs soils, vegetation and local reports; it is CONTEXT beside the river’s own record above, not the water-rights picture.
This basin’s droughts, by its own record
| Drought | Span | Weeks | Trough percentile | Flows recovered | Water table back |
|---|---|---|---|---|---|
| the 2020-22 drought | 2020-09-21 → 2021-03-15 | 25 | 22nd (2020-11-30) | 2 weeks | — |
| the 2018 drought | 2018-09-24 → 2019-02-25 | 22 | 23rd (2018-12-03) | 2 weeks | — |
| the 2012-13 drought | 2012-08-27 → 2013-11-11 | 63 | 17th (2012-11-12) | 0 weeks | — |
| unnamed dry spell | 2009-01-19 → 2009-08-24 | 31 | 26th (2009-02-09) | 28 weeks | — |
| unnamed dry spell | 2006-07-17 → 2007-03-19 | 35 | 18th (2006-11-27) | 155 weeks | — |
| unnamed dry spell | 2005-08-22 → 2006-04-03 | 32 | 28th (2005-09-12) | 205 weeks | — |
| the 2002 drought | 2000-09-04 → 2003-07-21 | 150 | 4th (2002-11-04) | 71 weeks | not yet (26 of 27 wells still below) |
| unnamed dry spell | 1994-09-12 → 1995-08-28 | 50 | 13th (1994-11-28) | 0 weeks | — |
| unnamed dry spell | 1992-11-09 → 1993-08-09 | 39 | 20th (1993-03-15) | 3 weeks | 6 yr (5 wells, 2 still below) |
| unnamed dry spell | 1991-02-18 → 1991-10-07 | 33 | 15th (1991-05-13) | 99 weeks | 1 yr (38 wells, 15 still below) |
| unnamed dry spell | 1988-10-10 → 1990-06-11 | 87 | 12th (1989-03-13) | 9 weeks | — |
| unnamed dry spell | 1987-04-06 → 1988-05-30 | 60 | 15th (1987-07-13) | 115 weeks | — |
| the 1981 drought | 1981-05-11 → 1982-08-30 | 68 | 14th (1981-08-03) | 4 weeks | 2 yr (23 wells, 2 still below) |
| unnamed dry spell | 1979-01-15 → 1979-08-20 | 31 | 14th (1979-03-26) | 0 weeks | 1 yr (26 wells, 2 still below) |
Detected mechanically: the 26-week smoothed percentile below the 30th for at least 20 weeks; recovered on regaining the 50th. The water-table clock compares each monitoring well against its own pre-drought median (the 3 years before onset) and dates the year the median well got back — the aquifer remembers longest, and “still below” is a finding, not a gap. The knobs are stated because the episode list depends on them — a different reasonable choice merges or splits episodes at the edges. Names are attached where an episode overlaps a drought Colorado already talks about.
What drought has cost here
Since 1991, federal crop insurance has paid $38,566,387 in drought-caused claims across Larimer, Weld counties — 15.4% of all insured crop losses there. The worst year was 2022 ($8,759,643).
USDA crop-insurance indemnities where the recorded cause of loss is drought, summed over the counties this district's gages sit in. Counties overlap water districts imperfectly, and insured-crop claims are a floor on drought damage, not a total. Source: USDA RMA cause-of-loss files.
When this basin claimed its water
Every bar is a year’s new appropriations (3,667 rights across 145 years of shared record), colored by that year’s wetness from the barcode above. Here the correlation is -0.26 — this basin tended to claim water in dry times, under scarcity pressure. Across the state both behaviors exist: ephemeral southwest basins file after wet demonstrations, transbasin-source basins under drought — and the biggest statewide filing waves sat in the 1950s drought and after 2002, not in the wet 1980s–90s.
Appropriation dates are the CLAIMED initiation of a right, not the courthouse filing date; the record is survivor-biased (abandoned claims are absent, so failed dry-era scrambles are undercounted); and the big 1960s and 2000s spikes sit on legal events — the pre-1969-Act adjudication era and 2000s legislation — not on weather. A correlation here is a description, never a cause.
New to how a dry winter becomes a call on the river? Anatomy of a drought walks the chain in four minutes — snow to rivers to reservoirs to calls to the water table.
Legal
Who serves it, who protects it
Two registers the site fetches on their own schedules, read for this district. Neither is a DWR record; each links its own page and its agency.
Public water systems here
Source Register of another agency · fetched 2026-10-06 · verify at EPA SDWIS ↗
19 systems touch this district (19 community systems reporting 544,106 people served, a figure that counts a wholesaler's customers twice); none carries an open health-based violation on EPA's record.
| System | Serves | Source | Here |
|---|---|---|---|
| FT COLLINS CITY OF | 179,901 | Surface water | 100% of its area |
| GREELEY CITY OF | 132,310 | Surface water | 67% of its area |
| FT COLLINS LOVELAND WD | 63,532 | Purchased surface water | 76% of its area |
| EAST LARIMER COUNTY WD | 27,944 | Purchased surface water | 100% of its area |
| CSU MAIN AND WEST HOUSING CAMPUS | 27,375 | Purchased surface water | 100% of its area |
| LITTLE THOMPSON WD | 25,654 | Purchased surface water | 2% of its area |
| WINDSOR TOWN OF | 23,500 | Purchased surface water | 97% of its area |
| NORTH WELD COUNTY WD | 15,890 | Purchased surface water | 56% of its area |
and 11 more; the full directory filters by district.
Instream-flow rights held by the state
Source Register of another agency · fetched 2026-10-11 · verify at CWCB instream flow program ↗
68 reaches over 409.7 miles and 4 natural lake levels, held by the Colorado Water Conservation Board so that water stays in the stream. Every reach, with its schedule and case →
- Cache la Poudre River, 21.6 mi: 38 (1/1 - 12/31) cfs (appropriated 1985, 85CW0422) · dossier
- Elkhorn Creek, 19.0 mi: 2 (1/1 - 12/31) cfs (appropriated 1978, 78W9262) · dossier
- Trail Creek, 15.0 mi: 2 (1/1 - 12/31) cfs (appropriated 1978, 78W9369) · dossier
- North Fork Cache La Poudre River, 14.3 mi: 14 (1/1 - 12/31) cfs (appropriated 1985, 85CW0428) · dossier
- South Lone Pine Creek, 13.9 mi: 2 (1/1 - 12/31) cfs (appropriated 1985, 85CW0424) · dossier
- North Fork Rabbit Creek, 12.5 mi: 1 (1/1 - 12/31) cfs (appropriated 1985, 85CW0434) · dossier
and 66 more on the district's instream-flow page.
What the water is like -- USGS sensors right now, where it has been sampled, the impaired-waters list, and how the tap water here stands with EPA -- is on the Water quality tab.
Designated groundwater basins are on their own page.
Source Adjudicated record · verify at DWR water-right transactions ↗ Source Adjudicated record · verify at DWR net amounts ↗
Decreed rights on this network run from 1860-06-01 to 2021-12-29. 25 abandonment screens and 21 compliance flags are listed below as leads for review — a screen is not an abandonment and a flag is not a violation.
Rights on file: 4905 across 2964 structure(s); 0 structure(s) carry 0 court-case references. Advisory reading aids on public DWR data — not administrative or legal conclusions.
Abandonment radar (25 screens)
Absolute rights with 10+ years of no recorded diversions. Screens only — storage, alternate points, and plan operations can explain nonuse lawfully. And diversion REPORTING itself only reached its modern level ~1982 — idleness that begins before then may be unreported use, not nonuse (flagged † below).
- MARTIN CALLOWAY DITCH (0301109) DWR↗ (1868-03-01, 15.2 cfs decreed): last active 1977 — 48 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1982) -- early absence of record is weak evidence of nonuse
- CHAFFEE DITCH (0300925) DWR↗ (1872-03-10, 22.4 cfs decreed): last active 1979 — 46 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1982) -- early absence of record is weak evidence of nonuse
- BOXELDER CHANNEL DITCH 1 (0301115) DWR↗ (1880-05-01, 2.5 cfs decreed): last active 1979 — 46 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1982) -- early absence of record is weak evidence of nonuse
- BOXELDER RES 1 (0303717) DWR↗ (1883-07-01, 0.0 cfs decreed): last active 1987 — 38 years idle
- WILLIAM CALLOWAY DITCH 2 (0300996) DWR↗ (1875-01-28, 4.9 cfs decreed): last active 1992 — 33 years idle
- SWANSON RES (0303568) DWR↗ (1935-12-31, 0.0 cfs decreed): last active 1993 — 32 years idle
- MITCHELL WEYMOUTH D 1 (0301040) DWR↗ (1874-05-15, 17.4 cfs decreed): last active 1996 — 29 years idle
- GRAY RES 3 (0303748) DWR↗ (1904-11-14, 0.0 cfs decreed): last active 1997 — 28 years idle
- CHASE DITCH (0300997) DWR↗ (1880-07-07, 21.4 cfs decreed): last active 2000 — 25 years idle
- PANHANDLE RES (0303814) DWR↗ (1968-12-12, 0.0 cfs decreed): last active 2002 — 23 years idle
Compliance screens (21 advisory flags)
Screened 53 of 2964 structures with rights (150 have diversion history on file). A flag is a lead for expert review — augmentation plans, exchanges, and free-river conditions can make over-decree diversions lawful and are deliberately not modeled.
- POUDRE VALLEY CANAL (0300907) DWR↗: Observed p99 daily rate 410.0 cfs (max 642.0) exceeds total decreed absolute 29.5 cfs across 21781 recorded day(s).
- CACHE LA POUDRE DITCH (0300915) DWR↗: Observed p99 daily rate 101.0 cfs (max 155.0) exceeds total decreed absolute 82.5 cfs across 47467 recorded day(s).
- OGILVY DITCH (0300937) DWR↗: Observed p99 daily rate 92.7 cfs (max 129.0) exceeds total decreed absolute 91.1 cfs across 34729 recorded day(s).
- GREELEY FILTERS PIPELINE (0300908) DWR↗: Observed p99 daily rate 40.1 cfs (max 57.5) exceeds total decreed absolute 28.0 cfs across 97082 recorded day(s).
- WETZLR WYMOUTH MITCHEL D (0301041) DWR↗: Observed p99 daily rate 15.9 cfs (max 20.0) exceeds total decreed absolute 13.4 cfs across 4982 recorded day(s).
- TAYLOR GILL DITCH (0301029) DWR↗: Observed p99 daily rate 13.9 cfs (max 49.4) exceeds total decreed absolute 12.2 cfs across 29504 recorded day(s).
- NEW CACHE EATON DRAW DIVERSION (0300773) DWR↗: Observed p99 daily rate 12.8 cfs (max 97.0) exceeds total decreed absolute 7.4 cfs across 4196 recorded day(s).
- EAGLE LAKE (0303351) DWR↗: Observed p99 daily rate 10.4 cfs (max 11.7) exceeds total decreed absolute 4.5 cfs across 82 recorded day(s).
- PEERY DITCH NO 1 (0301051) DWR↗: Observed p99 daily rate 5.2 cfs (max 6.2) exceeds total decreed absolute 3.5 cfs across 1400 recorded day(s).
- SOUTH FORK PIPELINE (0301059) DWR↗: Observed p99 daily rate 5.0 cfs (max 7.4) exceeds total decreed absolute 4.1 cfs across 1190 recorded day(s).
Seniority (top structures by decreed rate)
| Structure | Senior priority date | Rights | Decreed abs (cfs) | Decreed abs (AF) | Conditional? |
|---|---|---|---|---|---|
| LARIMER WELD IRR CANAL (0300919) DWR↗ | 1861-06-01 | 45 | 2797.5 | 0 | — |
| NEW CACHE LA POUDRE CO DITCH (0300929) DWR↗ | 1862-03-01 | 31 | 763.6 | 0 | yes |
| LARIMER COUNTY DITCH (0300911) DWR↗ | 1861-06-01 | 40 | 750.0 | 0 | yes |
| NORTH POUDRE CANAL (0300994) DWR↗ | 1861-06-01 | 57 | 715.0 | 0 | — |
| NORTH POUDRE SUPPLY CNL (0300905) DWR↗ | 1861-06-01 | 57 | 281.2 | 0 | yes |
| LARIMER WELD WEST DRAIN (0301305) DWR↗ | 1864-06-01 | 2 | 220.0 | 900 | — |
| CANAL 3 DITCH (0300934) DWR↗ | 1870-04-01 | 14 | 181.9 | 76 | yes |
| LARIMER COUNTY NO 2 D (0300914) DWR↗ | 1861-06-01 | 42 | 178.5 | 440 | yes |
| LARIMER CO NO 2 SPG CR (0301104) DWR↗ | 1873-04-01 | 1 | 175.0 | 0 | — |
| LARIMER WELD MIDDLE DRAN (0301304) DWR↗ | 1864-06-01 | 2 | 170.0 | 500 | — |
| LARIMER WELD EAST DRAIN (0301306) DWR↗ | 1864-06-01 | 2 | 170.0 | 630 | — |
| NEW MERCER D SPG CR DIVR (0301088) DWR↗ | 1872-07-01 | 2 | 164.0 | 0 | — |
| LAKE CANAL DITCH (0300922) DWR↗ | 1861-06-01 | 24 | 158.3 | 590 | — |
| PLEASANT VALLEY LAKE CNL (0300910) DWR↗ | 1861-06-01 | 28 | 137.9 | 0 | — |
| CACHE LA PODR RES INLET CANAL (0300924) DWR↗ | 1865-04-10 | 8 | 120.0 | 0 | — |
Recent inventory & legal-document changes
- 2026-10-10 — call set: SOUTH FLAT DITCH (39707)
- 2026-10-10 — call set: STERLING IRR CO DITCH 1 (39706)
- 2026-10-10 — call released: 39612
- 2026-10-09 — call released: 39680
- 2026-10-09 — call set: SOUTH PLATTE RIVER AT WATERTON (39697)
- 2026-10-09 — call set: CHATFIELD RESERVOIR (39698)
- 2026-10-09 — call released: 39678
- 2026-10-08 — call set: TRUE WEBSTER DITCH (39693)
Water-court filings this month (division-wide)
24 applications in the 2026-08 resume for this basin's division — new rights, changes, augmentation plans — from the water clerk's statutory monthly notice (C.R.S. 37-92-302), the earliest public signal of a new claim. Filings are division-wide, not district-filtered: check the county column. Full resume PDF at the Judicial Branch →
Anyone affected may file a statement of opposition until 2026-10-31 (18 days left). C.R.S. 37-92-302(3): due by the last day of the second month following the filing month — computed, not legal advice; confirm with the water clerk.
All 24 filings, with excerpts
| Case | What it asks | County | Excerpt |
|---|---|---|---|
2026CW3039
|
— | — | CASE NO. 20 26CW3039; STATE ENGINEER AND WATER DIV 2 ENGINEER vs. ANDREW STOREY – Verified Complaint for Injunctive Relief, Penalties, and Costs. This case is being listed in the resume to account for the case number in consecutive order. ---------------------… |
2026CW3040
|
plan for augmentation, new underground right | — | CASE NO. 2026CW3040 , Water Division 2 and CASE NO. 2026CW3135, Water Division 1; JANICE L DUNCAN, 6440 Highline Place, Colorado Springs, CO, 80908 (Please address all pleadings and inquiries regarding this matter to Applicant’s attorney: Philip E. Lopez, Eric… |
2026CW3088
|
plan for augmentation | — | CASE NUMBER 2026CW3088 NORTH RANCH, LLC, c/o Robert L. Myers, 944 Cheyenne Blvd., Colorado Springs, CO 80905; Please direct all correspondence concerning the application to: Ryan W. Farr, Sedona E. Chavez, Monson, Cummins, Shohet & Farr, LLC, 13511 Northgate E… |
2026CW3089
|
— | — | CASE NUMBER 20 26CW3089 ROBERSON LIVING TRUST, c/o Tamara Roberson -George, Rex Roberson, Kevin Roberson, Co-Trustees, 18235 Black Forest Road, Colorado Springs, CO 80908; Please direct all correspondence concerning this application to: David M. Shohet, and Se… |
2026CW3119
|
change of water right, plan for augmentation, new storage right | — | CASE NUMBER 2026CW3119 SHARON AND MARK WEATHERFORD, 12328 S. State Hwy 83, Franktown, CO 80116. (Forward all pleadings and correspondence to Chris D. Cummins and Sedona E. Chavez, Monson, Cummins, Shohet & Farr, LLC, 13511 Northgate Estates Dr., Ste. 250, Colo… |
2026CW3120
4404471 |
reasonable diligence | THE CITY AND | CASE NUMBER 2026CW3120 THE CITY AND COUNTY OF DENVER, ACTING BY AND THROUGH ITS BOARD OF WATER COMMISSIONERS (“Denver Water” or “Applicant”), 1600 West 12th Avenue, Denver, Colorado 80204. Jessica R. Brody, General Counsel, Daniel J. Arnold, James M. Wittler, … |
2026CW3121
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— | — | CASE NUMBER 2026CW3121 (2018CW3222)… |
2026CW3122
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plan for augmentation, new underground right | — | CASE NUMBER 2026CW3122 DOUBLE S CONSTRUCTION & DESIGN LLC, ATTN: Scott Berry, 42631 Sager Lane, Parker, CO, 80138. APPLICATION FOR UNDERGROUND WATER RIGHTS FROM NONTRIBUTARY AND NOT-NONTRIBUTARY SOURCES AND APPROVAL OF PLAN FOR AUGMENTATION, IN THE NONTRIBUTAR… |
2026CW3123
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reasonable diligence | THE CITY AND | CASE NUMBER 2026CW3123 THE CITY AND COUNTY OF DENVER, ACTING BY AND THROUGH ITS BOARD OF WATER COMMISSIONERS (“Denver Water” or “Applicant”), 1600 West 12th Avenue, Denver, Colorado 80204. Jessica R. Brody, General Counsel, Daniel J. Arnold, James M. Wittler, … |
2026CW3124
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reasonable diligence, make absolute, new underground right | — | CASE NUMBER 2026CW3124 WESTERN EQUIPMENT AND TRUCK, INC. , 2055 1 st Ave., Greeley, CO 80631, 970 -353-6682. P. Andrew Jones, Law Office of P. Andrew Jones, 1213 Founders Circle, Windsor, CO 80550, 970 -297-0570, ajones@pandrewjones.com. APPLICATION TO MAKE CO… |
2026CW3125
0600538 0600565 0600576 |
reasonable diligence | EASONABLE DILIGENCE IN BOULDER | CASE NUMBER 2026CW3125 (90CW108) (99CW125) (12CW72) (20CW3017) APPLICATION FOR FINDING OF REASONABLE DILIGENCE IN BOULDER COUNTY . 1. Name, Mailing Address, Phone Number, and E -mail Address of Applicant . CITY OF LAFAYETTE , c/o Cari Bischoff, Water Resources… |
2026CW3126
0815262 0815263 0815264 |
reasonable diligence, make absolute | — | CASE NUMBER 2026CW3126 MARY GUENZEL CHARITABLE TRUST, P.O. Box 9, Woodland Park, Colorado 80866; Please direct all correspondence concerning this application to: Ryan W. Farr, Monson, Cummins, Shohet & Farr, LLC, 13511 Northgate Estates Drive, Suite 250, Color… |
2026CW3127
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new underground right | UPPER LARAMIE AQUIFER IN WELD | CASE NUMBER 2026CW3127 THE CITY OF GREELEY, ACTING BY AND THROUGH ITS WATER AND SEWER BOARD, AND THE COLORADO STATE BOARD OF LAND COMMISSIONERS. APPLICATION FOR NONTRIBUTARY UNDERGROUND WATER RIGHTS IN THE UPPER LARAMIE AQUIFER IN WELD COUNTY. I. Name, mailing… |
2026CW3128
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reasonable diligence, make absolute | — | CASE NUMBER 2026CW3128 Applicant. CHRIS DINSDALE, P.O. Box 1807, Sterling, CO 80751, 970-522-9052 with all correspondence connected herewith being sent to Applicant’s Counsel, David P. Jones, Lawrence Custer Grasmick Jones & Donovan, LLP., 5245 Ronald Regan Bl… |
2026CW3129
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plan for augmentation, new underground right | PLAN FOR AUGMENTATION IN ELBERT | CASE NUMBER 2026CW3129 VANCE ROBERT ANDRUS & TONI COLLEEN ANDRUS , 6414 Sherman Peak, Castle Rock, Colorado 80108. APPLICATION FOR UNDERGROUND WATER RIGHTS FROM NONTRIBUTARY AND NOT-NONTRIBUTARY SOURCES AND APPROVAL OF PLAN FOR AUGMENTATION IN ELBERT COUNTY . … |
2026CW3130
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— | — | CASE NUMBER 2026CW 3130 THE CITY OF GREELEY, ACTING BY AND THROUGH ITS WATER AND SEWER BOARD c/o Leah Hubbard, Deputy Director of Water Resources, 1001 – 11th Avenue, 2nd Floor, Greeley, Colorado 80631, leah.hubbard@greeleygov.com, (970) 350-9811. Please send … |
2026CW3131
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reasonable diligence | — | CASE NUMBER 2026CW3131 CITY OF LOVELAND , Colorado (“Loveland”), c/o Noah Cecil, Assistant City Attorney, 500 East Third Street, #330, Loveland, Colorado 80537, Telephone: (970) 962 - 2434. APPLICATION FOR FINDING OF REASONABLE DILIGENCE IN LARIMER AND WELD CO… |
2026CW3132
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— | — | CASE NUMBER 2026CW3132 Applicants. THE CENTRAL COLORADO WATER CONSERVANCY DISTRICT AND THE GROUNDWATER MANAGEMENT SUBDISTRICT OF THE CENTRAL COLORADO WATER CONSERVANCY DISTRICT , 3209 West 28 th Street, Greeley, Colorado, 80634, 970-330-4540 with all future co… |
2026CW3133
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reasonable diligence | — | CASE NUMBER 2026CW3133 CHELEY LAND, LLC AND CHELEY COLORADO CAMPS, LLC (f.k.a. Cheley Colorado Camps, Inc.) , 601 Steele Street, P.O. Box 6525, Denver, CO 80206. c/o Karen L. Henderson, Bushong & Holleman PC, 1966 13th Street, Suite 270, Boulder, CO 80302; (30… |
2026CW3139
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change of water right | — | CASE NUMBER 2026CW3139 ALBERT WENDELL NELSON REVOCABLE TRUST c/o Wendell Nelson, Trustee 5537 N. County Road 9 Fort Collins, CO 80524 303 -921-4750 Sally Jean Nelson Revocable Trust c/o Wendell Nelson, Trustee 5537 N. County Road 9 Fort Collins, CO 80524 303 -… |
2026CW3140
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plan for augmentation | PLAN FOR AUGMENTATION IN ELBERT | CASE NUMBER 2026CW3140 DAVID JOE KRAXNER III, 754 Highway 86, Elizabeth, CO, 80107. Philip E. Lopez, Eric K. Trout, Fairfield and Woods, P.C., 1801 California St, Suite 2600, Denver, CO, 80202. APPLICATION FOR A PLAN FOR AUGMENTATION IN ELBERT COUNTY. Subject … |
2026CW3141
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plan for augmentation | — | CASE NUMBER 2026CW3141 KELTY COLORADO FAMILY LLLP, C/o Bruff Shea, P.O. Box 21, Franktown, Colorado 80166. Please direct all pleadings and correspondence to Applicants counsel: Michael A. Kopp, Trout Raley PC, 1120 Lincoln St., Suite 1600, Denver, CO 80203, (3… |
2026CW3142
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new underground right | — | CASE NUMBER 2026CW3142 1. Name, address, and telephone number of Applicant and Landowner: 1.1. Applicant and Landowner: CAP LAND LLC, a Colorado limited liability company 47 (“CAP Land”) c/o Lena Vander Laan P.O. Box 105 Henderson, CO 80640 Please direct all c… |
2026CW9
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reasonable diligence, make absolute | LARIMER | CASE NUMBER 2026CW9 SPRING44 DISTILLING, INC. (“Spring44”), 505 West 66th Street, Loveland, Colorado 80538, Telephone: (970) 445 -7109. APPLICATION FOR FINDINGS OF REASONABLE DILIGENCE AND CLAIM TO MAKE CERTAIN AMOUNTS ABSOLUTE IN LARIMER COUNTY. 2. Lindauer S… |
Active substitute water supply plans in this district
Temporary State Engineer approvals to divert out of priority (37-92-308 / 37-90-137). A structure operating under one behaves differently under a call than its decreed rights alone suggest — the priority tables above don't know about these; this list does. Source: DWR’s active-SWSP register, refreshed nightly.
| Plan | Type | Status | Expires | Structure | Documents |
|---|---|---|---|---|---|
| FIRESTIEN/TIGGES PIT-M96-060 | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2026-06-30 | 0302590 | plan file |
| F-STREET PIT AKA 83RD JV "F" STREET PIT (RESOURCE) PLAN NO. 3450 | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2026-12-31 | — | plan file |
| LOVELAND READY MIX CONCRETE-LAPORTE OPERATIONS/KNOX PIT | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2026-12-31 | 0302532 | plan file |
| VARRA COMPANIES INC. - FEIT WELL - 78554-F | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2026-12-31 | 0304999 | plan file |
| VARRA-COULSON RESOURCE PROJECT | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2026-12-31 | 0303044 | plan file |
| W W FARMS (AKA RIVERVIEW FARMS) | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2026-12-31 | — | plan file |
| WESTERN SUGAR PIT (M10-49) | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2026-12-31 | 0303038 | plan file |
| EAST 8TH STREET PIT (M-2000-082) | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2027-03-31 | 0302562 | plan file |
| GREELEY PIT (35 AVE) M77036 | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2027-03-31 | 0302546 | plan file |
| GREELEY PIT (M1977-151) | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2027-03-31 | 0302545 | plan file |
| POUDRE TECH WHITNEY LEASE | 37-92-308(5) PLANS LESS THAN 5 YEARS | Approved | 2027-03-31 | 0302551 | plan file |
| TIMNATH-CONNELL PIT M99050 | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2027-03-31 | 0302526 | plan file |
| FORT COLLINS - WSSC SHARES | 37-92-308(4) PLAN PENDING COURT APPLICATION | Approved | 2027-04-30 | — | plan file |
| MARTIN MARIETTA'S PARSONS MINE | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2027-05-31 | 0302583 | plan file |
| WINDSOR EAST MINE | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2027-05-31 | — | plan file |
| EAST RIGDEN PIT | 37-90-137(11) GRAVEL PIT PLAN | Approved | 2027-06-30 | 0302570 | plan file |
| 25TH AVENUE PIT | 37-90-137(11) GRAVEL PIT PLAN | Approved | — | 0303330 | plan file |
| EAST LARIMER COUNTY AND FORT COLLINS-LOVELAND WATER DISTRICTS - NEW MERCER SHARES | 37-92-308(4) PLAN PENDING COURT APPLICATION | Approved | — | — | plan file |
| LAMB LAKES | 37-90-137(11) GRAVEL PIT PLAN | Approved | — | 0302556 | plan file |
| BUCKLEN EQUIPMENT CO - BUCKLEN PIT | 37-90-137(11) GRAVEL PIT PLAN | Pending | — | 0302538 | plan file |
| HARTFORD - PRAIRIE SONG | 37-92-308(4) PLAN PENDING COURT APPLICATION | Pending | — | 0302594 | plan file |
| HOME OFFICE PIT | 37-90-137(11) GRAVEL PIT PLAN | Pending | — | 0302517 | plan file |
| LA POUDRE (M83090) | 37-90-137(11) GRAVEL PIT PLAN | Pending | — | 0303010 | plan file |
| NORTH LA POUDRE (M00-144) | 37-90-137(11) GRAVEL PIT PLAN | Pending | — | 0302519 | plan file |
| SUNSET INDUSTRIAL PIT | 37-90-137(11) GRAVEL PIT PLAN | Pending | — | — | plan file |
Showing 25 of 30 plans — the rest are on DWR’s register.
Water quality
The water itself, in this district
Four registers, each on its own schedule: what USGS sensors read right now, where samples have been taken, which stretches the state lists as impaired, and how the tap water of the systems here stands with EPA. None is a DWR record; each links its own page.
Right now
Source Provisional telemetry · fetched 2026-10-13 · verify at USGS current conditions ↗
2 USGS sensors report temperature, conductance, dissolved oxygen or turbidity from inside this district; provisional readings, never merged into the verified record.
| Site | Temp °C | Cond µS/cm | DO mg/L | Turb FNU | As of |
|---|---|---|---|---|---|
| CACHE LA POUDRE R ABV N 11TH AVE AT GREELEY, CO ↗ | 16.9 | 6.0 | 88 | 2026-10-13 05:30 | |
| CACHE LA POUDRE RIVER BELOW HWY 85 AT GREELEY, CO ↗ | 16.6 | 5.9 | 12 | 2026-10-13 05:30 |
Where water has been sampled
Source Register of another agency · fetched 2026-10-08 · verify at Water Quality Portal ↗
The portal lists 1,425 sampling stations in this district's watershed (Cache La Poudre 10190007), of which 90 reported a sample in the last 5 years on the state and tribal side (USGS activity is in the station count, not in that figure). Most active: Colorado Dept. of Public Health & Environment-WQCD (48), Coalition for the Poudre River Watershed (Volunteer) (30), Colorado River Watch (10). Most-sampled groups: Nutrient, Inorganics, Major, Metals, Physical, Inorganics, Major, Non-metals. Every station as a file ↗
Results themselves are not fetched here; USGS samples added after March 2024 may not be in the portal's legacy profiles yet.
Drinking water
Source Register of another agency · fetched 2026-10-07 · verify at EPA SDWIS ↗
19 community systems touch this district. None carries an open health-based violation on EPA's record; 1 is listed by EPA as serious violator. EPA sampled 13 of them for PFAS in 2023–25; 1 had PFOA or PFOS at or above the 2024 limit.
| System | Serves | EPA record | PFAS (UCMR 5) | Lead, latest 90th pct |
|---|---|---|---|---|
| LITTLE THOMPSON WD | 25,654 | clean, last 12 quarters | PFOA at or over the limit | — |
| FT COLLINS CITY OF | 179,901 | 3 of 12 quarters with a violation | none detected | 0.0028 mg/L |
| GREELEY CITY OF | 132,310 | 3 of 12 quarters with a violation | none detected | 0.004 mg/L |
| FT COLLINS LOVELAND WD | 63,532 | clean, last 12 quarters | none detected | 0.002 mg/L |
| EAST LARIMER COUNTY WD | 27,944 | 2 of 12 quarters with a violation | none detected | 0.0039 mg/L |
| CSU MAIN AND WEST HOUSING CAMPUS | 27,375 | 4 of 12 quarters with a violation | none detected | 0.008 mg/L |
| WINDSOR TOWN OF | 23,500 | 1 of 12 quarters with a violation | none detected | 0.0058 mg/L |
| NORTH WELD COUNTY WD | 15,890 | clean, last 12 quarters | none detected | 0.0034 mg/L |
| SEVERANCE TOWN OF | 11,733 | 5 of 12 quarters with a violation | none detected | 0.002 mg/L |
| WELLINGTON TOWN OF | 11,720 | 5 of 12 quarters with a violation | none detected | 0.0037 mg/L |
and 9 more; the full directory filters by district.
EPA's record carries violations and lead/copper percentiles; nitrate and disinfection by-product results are not in it. UCMR 5 samples are monitoring, not compliance, and the 2024 PFOA/PFOS limits equal its reporting limit, so any detection of those two is at or above them.
Impaired waters
Source Register of another agency · verify at EPA ATTAINS ↗
The state's 303(d) impaired-waters list has not been joined to this basin's own watershed boundary yet, so nothing is shown rather than a guess; the basins with a join carry the full list here. Why the join is geometry, not a name match.
Call cascade
If a call were placed at a given seniority, which structures in this basin would be out of priority, and how much of their decreed rate would be curtailed? Computed from this basin's cached decrees.
What this does and doesn't model. Seniority arithmetic only: every right junior to the call is treated as curtailed. It does not model reach applicability — structures downstream of the calling point are not administered by it — and it applies no futile-call judgment. Read it as “who is junior to this date, and by how much,” not as a prediction of what the Division Engineer would actually order.
Pick a calling right
Real decrees from this basin, ordered by administration number — that is, by actual seniority. The years will look out of order, and that is correct: an administration number encodes the adjudication date as well as the appropriation date, so a right appropriated in 1970 can be administered ahead of one from 1950. A senior call curtails almost everything; a junior one curtails almost nothing.
Or enter an administration number directly
DWR administration numbers encode appropriation and adjudication dates; lower is more senior.
This week's diagnostic
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System status
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Active river calls
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Hydrographs vs. historical envelope
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Anomaly flags
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Snowpack — 4 SNOTEL sites report here. Runoff outlook — Cache La Poudre R at Canyon Mouth: even odds of at least 87 kAF over 06-01 to 09-30 — 51% of a normal season, per NRCS, issued 2026-06-01 — the season’s final; new forecasts begin in January. Full snow & runoff picture — charts, forecast history and how the forecasts have verified →
Sites, exceedance bands and sources
| SNOTEL site | Elev (ft) | SWE (in) | Median (in) | % of median | Typical peak |
|---|---|---|---|---|---|
| Black Mountain | 8940 | 0.1 | 0.0 | — | April 17 (12.5 in) |
| Deadman Hill | 10240 | 0.1 | 0.6 | — | May 4 (21.8 in) |
| Hourglass Lake | 9380 | 0.0 | 0.2 | — | April 19 (13.0 in) |
| Long Draw Resv | 9980 | 0.0 | 0.4 | — | April 27 (18.3 in) |
Cache La Poudre R at Canyon Mouth — 06-01 to 09-30 volume, thousand acre-feet (chance the volume is AT LEAST this):
| 90% | 70% | 50% | 30% | 10% | Normal |
|---|---|---|---|---|---|
| 68 | 79 | 87 | 96 | 110 | 169 |
Snow-water equivalent and medians (1991–2020) from NRCS SNOTEL; seasonal volume forecasts from the NRCS National Water and Climate Center. Sites and forecast points are assigned to the district whose boundary contains them — snowpack that feeds this district can also sit in a neighboring headwater district. Toggle the Snow chip on the map above to see the sites.
Topology cross-check: 10 parent disagreements, 20 sizable streams not on this network (vs DWR's route framework — under review)
This flow network was built mechanically; DWR's Source Water Route Framework disagrees with it in the places below. Each row is a question a human reviewer has not yet answered — not an error verdict. Checked 26 streams, 16 agree. Know this water? Tell us →
| Stream | This site routes it to | DWR routes it to |
|---|---|---|
| Sheep Creek | the mainstem | North Fork Cache La Poudre River |
| Fish Creek | the mainstem | Dale Creek |
| Trail Creek | the mainstem | North Fork Cache La Poudre River |
| Rabbit Creek | the mainstem | North Fork Cache La Poudre River |
| Lone Pine Creek | the mainstem | North Fork Cache La Poudre River |
| South Lone Pine Creek | the mainstem | Lone Pine Creek |
| North Lone Pine Creek | the mainstem | Lone Pine Creek |
| Manhattan Creek | the mainstem | Elkhorn Creek |
Sizable streams DWR maps here that this network does not carry:
Coalbank Creek (24 mi) · Fossil Creek (16 mi) · Owl Creek (11 mi) · Bennett Creek (11 mi) · Joe Wright Creek (11 mi) · The Slough (10 mi) · Spring Creek (8 mi) · Lewstone Creek (8 mi)