Hydrohistorian
Slater/Timberlake Creeks on the ground — the ditches, wells, reservoirs and gages of Water District 54 · clicktap anything for its record
Browse this district’s ditches, gages, reservoirs, wells and springs as a list.
The Slater Fork is critically low for late June -- 9% of normal flow, its 9th-driest such week in 95 years of record. 9 calls stand against it right now; the most senior right calling dates to 1882. This year's runoff outlook, issued 2026-06-01, called for 17% of normal.
Full diagnostic snapshot pending — this district's weekly-style report (system status, active calls, hydrographs, anomaly flags) is produced by the nightly rotation and appears here after its first run. The tabs above are live now.
Schematic
Historical
Evolution of the network
Trends
This year, in context
In the weeks around 2026-07-06 (the newest reading on file), flows at the 5 ranked gages are running at a median 19% of their own long-term norm for this window — 5 below a typical year, 0 at or above. Driest relative to its record: LITTLE SNAKE RIVER BELOW GIBSON BLAIR D, WY, ranking 1st lowest of 2 years.
How this comparison is made
Each gage's mean flow over the 3 days either side of 2026-07-06, 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 2026-08-30 21:05 from 9 gage(s) with cached period-of-record data. The series is each gage's annual mean flow in cfs (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 9 gages with enough record, 1 is trending down and 0 up, and 1 carries a detected shift. The clearest is Little Snake River near Dixon, Wy, its annual mean flow changing -19.89 cfs per decade (-4.2% of its median annual flow) over 52 years (p=0.0135). The other 8 show no clear signal either way.
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 |
|---|---|---|---|---|---|
|
▸
Little Snake River near Dixon, Wy LSRNDXWY |
↓ decreasing | -19.89 cfs -4.2% | p=0.014 | 52 | ~1952 |
8 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. 5 gage(s) and 94 structure(s) report in 2026, but structure reporting only reached half its modern level around ~1986. 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) |
|---|---|---|
| 1910s | 4 | 0 |
| 1920s | 2 | 0 |
| 1930s | 1 | 12 |
| 1940s | 2 | 40 |
| 1950s | 3 | 42 |
| 1960s | 3 | 58 |
| 1970s | 3 | 56 |
| 1980s | 3 | 56 |
| 1990s | 2 | 92 |
| 2000s | 1 | 98 |
| 2010s | 2 | 122 |
| 2020s | 2 | 79 |
Mass-balance (network closure) trend
Structure divrec-history backfill coverage as of the last check: 15% of 658 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 (173 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.
No reach shows a statistically significant long-term gain/loss shift.
Groundwater now has its own tab: 2 monitored well(s), water-table trends, stream corridors, and the advisory depletion screen.
Reservoirs now has its own tab: 17 reservoir(s), end-of-year storage back to 1961, click-to-chart histories.
Cross-gage pattern fingerprint
Not enough gages with a long enough common-coverage window yet to fingerprint shared patterns.
Structures most implicated by reconciliation (as of 2026-07-06)
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.
- ST LOUIS SPRING NO 1 (return): -0.7 cfs (1% of that reach's correction)
- ST LOUIS SPRING NO 2 (return): -0.7 cfs (1% of that reach's correction)
- ST LOUIS SPRING NO 3 (return): -0.7 cfs (1% of that reach's correction)
- ST LOUIS DITCH (diversion): -0.7 cfs (1% of that reach's correction)
- ST LOUIS SPRING NO 4 (return): -0.7 cfs (1% of that reach's correction)
- HOME SUPPLY DITCH (diversion): -0.7 cfs (1% of that reach's correction)
- BIG ALDER SPRING #1 (return): -0.7 cfs (1% of that reach's correction)
- BIG ALDER POND #1 (return): -0.7 cfs (1% of that reach's correction)
- DRIVEWAY SPRING (return): -0.7 cfs (1% of that reach's correction)
- NORTH SIDE DITCH (diversion): -0.7 cfs (1% 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_20260707 (imported 2026-08-19) for history, plus the CDSS REST API for current conditions.
| Check | State | What was measured |
|---|---|---|
| gage freshness | stale | newest gage reading is 55 day(s) old (target 7) |
| diversion record | expected-lag | newest diversion record is 356 day(s) old (DWR publishes ~1 year in arrears) |
| structure coverage | sparse | 15% of schematic structures have data |
Independent check: PASS — 100.0000% agreement across 170,191 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: FAIL — 75.61% day-level agreement with USGS's own published records for the same gages, across 9 co-listed station(s) and 86,386 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.
9 gage(s) / 86,015 daily values (1910-10-01–2026-07-06); 187 structure(s) with diversion records; 724 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
7 water-level measurements across 2 monitored well(s) — 2 alluvial, 0 bedrock — plus 1 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 0 well(s) with enough record for a trend test: 0 declining, 0 rising.
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.
Reservoirs
17 reservoir(s) with 902 storage measurement(s), 1961–2026. Basin storage as of 2025-10-31 (the record's own end — reservoir records publish ~annually): 471 AF across 14 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) | |
|---|---|---|---|---|---|
| ▸ LOWER COGDILL RES (5403944) | 197 | 2025-10-31 | — | — | dossier → |
| ▸ BOYER RESERVOIR (5403519) | 63 | 2025-10-31 | — | — | dossier → |
| ▸ UPPER COGDILL RES (5403945) | 54 | 2025-10-31 | — | — | dossier → |
| ▸ MCCARGER RES (5403946) | 43 | 2025-10-31 | — | — | dossier → |
| ▸ SLATER CR LAKE (5403948) | 28 | 2025-10-31 | — | — | dossier → |
| ▸ LAKE FORK RESERVOIR (5403591) | 26 | 2025-10-31 | — | — | dossier → |
| ▸ ELK LAKE RES (5403589) | 25 | 2025-10-31 | — | — | dossier → |
| ▸ MARTIN CULL RESERVOIR (5403780) | 15 | 2025-10-31 | — | — | dossier → |
Snow and runoff
Snow-water equivalent, WY2026
No snow on the ground — normal for the date; the snow year begins in October. The chart shows the full water year just ending.
| SNOTEL site | Elev (ft) | SWE (in) | Median (in) | % of median | Typical peak |
|---|---|---|---|---|---|
| Elkhead Divide | 8780 | 0.0 | — | — | — |
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 (2017–2026)
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 5 of the last 10 winters the snow never came — the pack peaked below 80% of its median. In 0 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. This year was one of the dry ones: the pack peaked at 49% of median.
The snow never came: 2018, 2021, 2022, 2025, 2026.
Computed by this site from 1 SNOTEL site’ full daily records (NRCS AWDB, back to 2017). 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 — Little Snake R nr Slater
NRCS's final issue (2026-06-01) calls it even odds that at least 9 kAF arrives over 06-01 to 07-31 — 17% of a normal season; almost certainly at least 4, probably not more than 28. Our own record at this gage shows 9 kAF actually delivered (partial record: 36 of 61 days). New forecasts begin in January. How to read these numbers →
| 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 |
|---|---|---|---|---|---|---|
| 4 | 7 | 9 | 17 | 28 | 53 | 9 |
How good are these forecasts here? (1976–2025)
Grading every April issue against what the river then delivered, measured at this gage’s own record — 48 seasons: the median miss of the 50% forecast is 20%, with a high bias of 6%, and the observed volume landed inside the stated 10–90% band 68% 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 →
Drought
Right now
This is the 9th-driest week 27 in 95 years of record at SLATER FORK NEAR SLATER, CO (as of 2026-06-29; this week’s flow sits at the 9th percentile for the date). On this week’s US Drought Monitor, Routt County is 33% in D4 exceptional drought (2026-09-01). The law agrees: the most senior active call leaves 100% of this district’s decreed flow rights junior to the calling right this week.
Every year since 1931, week by week
Each thin row is a year at SLATER FORK NEAR SLATER, CO; 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.
The Drought Monitor’s view since 2000
Mean share of area in each class across Moffat, Routt 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.
The law’s own drought gauge
When water runs short, administration answers: calls reach further back in time, and more decreed rights go junior to the calling right. This is that response, weekly since 2002 — the share of this district’s decreed flow rights junior to the most senior active call. Watch it spike in the named droughts below, and linger after the river recovers.
Computed from DWR’s call record (20 calls touching this district) against the district’s rights index. Scoping is deliberately coarse — a call’s own district, or districts named in its comments — and this is administration’s RESPONSE, not a per-structure verdict (each dossier’s curtailment card does that, with stream miles). A deepening call can also reflect growing demand, not only shrinking supply.
This basin’s droughts, by its own record
| Drought | Span | Weeks | Trough percentile | Recovery |
|---|---|---|---|---|
| unnamed dry spell | 2025-07-28 → 2026-05-11 | 41 | 16th (2025-10-06) | not yet |
| the 2020-22 drought | 2022-10-31 → 2023-07-03 | 35 | 13th (2023-04-03) | 0 weeks |
| the 2020-22 drought | 2021-05-10 → 2022-04-04 | 47 | 9th (2021-09-20) | 63 weeks |
| the 2020-22 drought | 2020-11-09 → 2021-05-03 | 25 | 24th (2021-01-04) | 111 weeks |
| the 2018 drought | 2018-08-27 → 2019-03-04 | 27 | 19th (2018-10-29) | 20 weeks |
| the 2012-13 drought | 2013-07-01 → 2014-01-13 | 28 | 15th (2013-09-16) | 8 weeks |
| the 2012-13 drought | 2012-09-03 → 2013-03-25 | 29 | 12th (2012-10-22) | 50 weeks |
| the 2002 drought | 2003-11-24 → 2004-05-17 | 25 | 27th (2003-12-22) | 29 weeks |
| the 2002 drought | 2002-07-01 → 2003-07-14 | 54 | 17th (2002-10-28) | 73 weeks |
| unnamed dry spell | 1994-09-05 → 1995-03-20 | 28 | 17th (1994-11-14) | 9 weeks |
| unnamed dry spell | 1992-09-14 → 1993-02-15 | 22 | 22nd (1992-10-19) | 10 weeks |
| unnamed dry spell | 1992-01-06 → 1992-08-31 | 34 | 22nd (1992-02-10) | 34 weeks |
| the 1981 drought | 1981-03-09 → 1981-09-28 | 29 | 23rd (1981-03-23) | 12 weeks |
| the 1977 drought | 1977-02-21 → 1978-06-05 | 67 | 11th (1977-08-15) | 4 weeks |
Detected mechanically: the 26-week smoothed percentile below the 30th for at least 20 weeks; recovered on regaining the 50th. 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 $487,504 in drought-caused claims across Moffat, Routt counties — 1.4% of all insured crop losses there. The worst year was 2013 ($227,009).
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 (546 rights across 96 years of shared record), colored by that year’s wetness from the barcode above. Here the correlation is +0.13 — essentially no wet-dry pattern; here, law and settlement set the pace, not the weather. 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
Decreed rights on this network run from 1879-04-01 to 2020-09-01. Of the 20 structures with a yield estimate, the median one’s senior right was in priority 10% of a median irrigation season and 0% in a dry one. 10 abandonment screens and 104 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: 800 across 724 structure(s); 71 structure(s) carry 0 court-case references. Advisory reading aids on public DWR data — not administrative or legal conclusions.
Is the river getting harder to divert from?
Over 2003–2025, administration on this district has been tightening: 1 of 3 measures (days under call, calls set, seniority of the controlling call) are moving toward more administration, none the other way.
The three measures, year by year
One row per whole calendar year inside the call record's coverage (23 years); partly-covered years are omitted rather than reported as quiet. Trend is Mann-Kendall with the same significance gate as every other trend on this site. Counted from DWR's published call record, which begins in the early 2000s: earlier years are absent, not quiet. A rise in the number of calls set can also reflect how finely an administrator records one episode, which is why days under call -- insensitive to that -- is the component to read first. Advisory summary of the public record, not an administrative finding.
| Year | Days under call | Calls set | Controlling priority (median) |
|---|---|---|---|
| 2014 | 204 | 38 | 1882-04-01 |
| 2015 | 215 | 27 | 1882-04-01 |
| 2016 | 198 | 56 | 1882-04-01 |
| 2017 | 185 | 73 | 1883-06-30 |
| 2018 | 197 | 95 | 1882-04-01 |
| 2019 | 177 | 30 | 1882-04-01 |
| 2020 | 204 | 109 | 1882-04-01 |
| 2021 | 250 | 158 | 1882-04-01 |
| 2022 | 249 | 87 | 1882-04-01 |
| 2023 | 365 | 50 | 1904-01-02 |
| 2024 | 306 | 75 | 1882-04-01 |
| 2025 | 186 | 97 | 1882-04-01 |
Why diversions stopped — call-based explanations
Sustained diversion stops matched to senior administrative calls.
- MORGAN & BEELER D (5400548) DWR↗ stopped 2025-08-04 (7+ days) — call at METZ & REIGAN DITCH curtailing 100% of its decreed rate [heuristic-strong]
- CANTLIN CREEK DITCH (5400512) DWR↗ stopped 2025-07-11 (25+ days) — call at METZ & REIGAN DITCH curtailing 100% of its decreed rate [heuristic-strong]
- LUCHSINGER DITCH (5400543) DWR↗ stopped 2025-07-09 (61+ days) — call at METZ & REIGAN DITCH curtailing 100% of its decreed rate [heuristic-strong]
- MCCARGER DITCH (5400547) DWR↗ stopped 2025-06-25 (12+ days) — call at WILLOW CK DITCH curtailing 100% of its decreed rate [heuristic-strong]
- MORGAN SLATER DITCH (5400549) DWR↗ stopped 2025-06-23 (14+ days) — call at WILLOW CK DITCH curtailing 100% of its decreed rate [heuristic-strong]
- BEELER DITCH (5400507) DWR↗ stopped 2024-09-14 (260+ days) — call at BEAR RIVER MSF-L curtailing 84% of its decreed rate [heuristic-partial]
- LUCHSINGER DITCH (5400543) DWR↗ stopped 2024-08-24 (272+ days) — call at COLLINS DITCH curtailing 100% of its decreed rate [heuristic-strong]
- MORGAN SLATER DITCH (5400549) DWR↗ stopped 2024-08-22 (14+ days) — call at COLLINS DITCH curtailing 50% of its decreed rate [heuristic-partial]
- CLARK BUTLER WESTFALL DITCH (5400513) DWR↗ stopped 2024-08-14 (291+ days) — call at NICKELL DITCH curtailing 63% of its decreed rate [heuristic-partial]
- CANTLIN CREEK DITCH (5400512) DWR↗ stopped 2024-07-19 (28+ days) — call at WISCONSIN DITCH curtailing 100% of its decreed rate [heuristic-strong]
- PERKINS FOX DITCH (5400554) DWR↗ stopped 2024-07-17 (41+ days) — call at WISCONSIN DITCH curtailing 100% of its decreed rate [heuristic-strong]
- OSCAR BEELER-ROBIDOUX D (5400551) DWR↗ stopped 2024-07-12 (311+ days) — call at METZ & REIGAN DITCH curtailing 100% of its decreed rate [heuristic-strong]
Right yield — how often could these rights actually divert?
Share of irrigation-season days each structure's rights were not called out, derived from the 22-year district-scoped call record (senior right = floor, junior right = ceiling constraint). Call-record-derived; DWR's own analysis governs where available.
| Structure | Senior priority | Senior right: median / dry yr | Junior right: median / dry yr |
|---|---|---|---|
| SLATER CREEK LOWER MSF (5402008) DWR↗ | 2017-01-24 | 7.5% / 0.0% | 7.5% / 0.0% |
| HANCOCK DITCH (5400528) DWR↗ | 1903-04-25 | 15.4% / 2.3% | 7.5% / 0.0% |
| TROWEL DITCH (5400583) DWR↗ | 1886-04-16 | 21.9% / 5.6% | 15.4% / 2.3% |
| PRATT PONDS DITCH (5401141) DWR↗ | 2000-05-03 | 7.5% / 0.0% | 7.5% / 0.0% |
| DUNCAN DITCH NO 1 (5400519) DWR↗ | 1902-07-02 | 15.2% / 2.3% | 10.0% / 0.0% |
| SEDIMENT CONTROL PONDS D (5401144) DWR↗ | 2000-05-03 | 7.5% / 0.0% | 7.5% / 0.0% |
| MID FK LIL SNAKE R MSF-L (5401020) DWR↗ | 1977-09-23 | 7.5% / 0.0% | 7.5% / 0.0% |
| WILLOW CK DITCH (5400591) DWR↗ | 1884-08-15 | 24.1% / 7.5% | 15.4% / 4.7% |
| BEELER DITCH (5400507) DWR↗ | 1886-06-10 | 21.9% / 5.6% | 7.5% / 0.0% |
| MIDDLE FORK CUTTHROAT PONDS DITCH (5401139) DWR↗ | 2000-05-03 | 7.5% / 0.0% | 7.5% / 0.0% |
| MID FK LIL SNAKE R MSF-M (5402055) DWR↗ | 1977-09-23 | 7.5% / 0.0% | 7.5% / 0.0% |
| NORTH FK LIL SNAKE R MSF (5402061) DWR↗ | 1977-09-23 | 7.5% / 0.0% | 7.5% / 0.0% |
Abandonment radar (10 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 ~1986 — idleness that begins before then may be unreported use, not nonuse (flagged † below).
- BAGGS DITCH (5400503) DWR↗ (1901-02-15, 0.7 cfs decreed): last active 1981 — 39 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1986) -- early absence of record is weak evidence of nonuse
- GOLD BLOSSOM DITCH (5400526) DWR↗ (1906-05-10, 3.1 cfs decreed): last active 1995 — 25 years idle
- BURTON DITCH (5400511) DWR↗ (1903-04-25, 1.2 cfs decreed): last active 2007 — 13 years idle
- FLEMING DITCH NO 1 (5400522) DWR↗ (1904-06-10, 0.5 cfs decreed): last active 2007 — 13 years idle
- FLEMING DITCH NO 2 (5400523) DWR↗ (1904-06-01, 0.2 cfs decreed): last active 2007 — 13 years idle
- HARTZELL DITCH (5400529) DWR↗ (1902-06-10, 1.4 cfs decreed): last active 2007 — 13 years idle
- JOLLEY DITCH (5400538) DWR↗ (1959-08-01, 14.0 cfs decreed): last active 2007 — 13 years idle
- ROCHELLE DITCH NO 2 (5400625) DWR↗ (1961-08-02, 2.0 cfs decreed): last active 2009 — 11 years idle
- PEROULIS PUMP NO 2 (5401081) DWR↗ (1990-03-23, 4.0 cfs decreed): last active 2009 — 11 years idle
- ROCHELLE DITCH NO 1 (5402085) DWR↗ (1961-08-02, 3.0 cfs decreed): last active 2009 — 11 years idle
Compliance screens (104 advisory flags)
Screened 138 of 724 structures with rights (153 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.
- STATE LINE WW DITCH (5402068) DWR↗: Observed p99 daily rate 207.0 cfs (max 207.0) exceeds total decreed absolute 7.0 cfs across 4700 recorded day(s).
- WEST SIDE CANAL (5400590) DWR↗: Observed p99 daily rate 200.9 cfs (max 228.4) exceeds total decreed absolute 10.9 cfs across 12509 recorded day(s).
- TROWEL DITCH (5400583) DWR↗: Observed p99 daily rate 75.0 cfs (max 84.3) exceeds total decreed absolute 31.3 cfs across 20413 recorded day(s).
- HANCOCK DITCH (5400528) DWR↗: Observed p99 daily rate 49.9 cfs (max 67.9) exceeds total decreed absolute 49.9 cfs across 35174 recorded day(s).
- NORTH SIDE OXBOW LAKES D (5401143) DWR↗: Observed p99 daily rate 40.0 cfs (max 40.0) exceeds total decreed absolute 10.5 cfs across 7828 recorded day(s).
- HEELEY DITCH (5400531) DWR↗: Observed p99 daily rate 35.0 cfs (max 45.0) exceeds total decreed absolute 9.0 cfs across 13944 recorded day(s).
- PRATT PONDS DITCH (5401141) DWR↗: Observed p99 daily rate 35.0 cfs (max 35.0) exceeds total decreed absolute 30.0 cfs across 10258 recorded day(s).
- JEBENS SEEP WASTE WATER (5400537) DWR↗: Observed p99 daily rate 30.4 cfs (max 30.4) exceeds total decreed absolute 4.1 cfs across 8124 recorded day(s).
- WILLOW CK DITCH (5400591) DWR↗: Observed p99 daily rate 25.0 cfs (max 33.6) exceeds total decreed absolute 16.2 cfs across 19365 recorded day(s).
- PERKINS IRR DITCH (5400555) DWR↗: Observed p99 daily rate 22.6 cfs (max 40.0) exceeds total decreed absolute 12.1 cfs across 10314 recorded day(s).
Seniority (top structures by decreed rate)
| Structure | Senior priority date | Rights | Decreed abs (cfs) | Decreed abs (AF) | Conditional? |
|---|---|---|---|---|---|
| SLATER CREEK LOWER MSF (5402008) DWR↗ | 2017-01-24 | 1 | 74.0 | 0 | — |
| HANCOCK DITCH (5400528) DWR↗ | 1903-04-25 | 8 | 49.9 | 0 | — |
| TROWEL DITCH (5400583) DWR↗ | 1886-04-16 | 5 | 31.3 | 0 | — |
| PRATT PONDS DITCH (5401141) DWR↗ | 2000-05-03 | 1 | 30.0 | 0 | — |
| DUNCAN DITCH NO 1 (5400519) DWR↗ | 1902-07-02 | 2 | 24.5 | 0 | — |
| SEDIMENT CONTROL PONDS D (5401144) DWR↗ | 2000-05-03 | 1 | 24.0 | 0 | — |
| MID FK LIL SNAKE R MSF-L (5401020) DWR↗ | 1977-09-23 | 1 | 20.0 | 0 | — |
| WILLOW CK DITCH (5400591) DWR↗ | 1884-08-15 | 2 | 16.2 | 0 | — |
| BEELER DITCH (5400507) DWR↗ | 1886-06-10 | 5 | 16.0 | 0 | — |
| MIDDLE FORK CUTTHROAT PONDS DITCH (5401139) DWR↗ | 2000-05-03 | 1 | 16.0 | 0 | — |
| MID FK LIL SNAKE R MSF-M (5402055) DWR↗ | 1977-09-23 | 1 | 15.0 | 0 | — |
| NORTH FK LIL SNAKE R MSF (5402061) DWR↗ | 1977-09-23 | 1 | 15.0 | 0 | — |
| JOLLEY DITCH (5400538) DWR↗ | 1959-08-01 | 1 | 14.0 | 0 | — |
| HOME SUPPLY DITCH (5400532) DWR↗ | 1896-04-12 | 2 | 13.1 | 0 | — |
| PERKINS IRR DITCH (5400555) DWR↗ | 1897-06-16 | 6 | 12.1 | 0 | — |
No inventory or legal-document changes detected since the daily watch began.
Water-court filings this month (division-wide)
5 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 (56 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 5 filings, with excerpts
| Case | What it asks | County | Excerpt |
|---|---|---|---|
2026CW10
|
— | ROUTT | 2026CW10 Routt County Application for Absolute Water Rights (Storage). Applicant: Wilton Earle 785 Valley View Drive Craig, CO 81625; 970-824-6258; rettae74@gmail.com.; Logan Earle 785 Valley View Drive Craig, CO 81625; 970-620-5288; earlelogan679@gmail.com St… |
2026CW11
|
— | RIO BLANCO | 2026CW11 Rio Blanco County Application for Simple Change in Surface Point of Diversion. Applicants: John and Diana Hartman, 2804 E Main Street, Rangely, CO 81648, 970-618-0088, dgrantelk@gmail.com Structure: Calvat Ditch. Original Decree: CA099. Case: 11/26/19… |
2026CW3009
|
reasonable diligence | — | 2026CW3009 ROUTT AND RIO BLANCO COUNTIES, Prima Ranches LLC, c/o David Harbaugh, 3575 E Cherry Creek North Drive, Denver, CO 80209, (303) 478-8997. Please address all correspondence to: Geoffrey M. Williamson, Katherine Carter, Berg Hill Greenleaf Ruscitti LLP… |
2026CW3010
|
change of water right, plan for augmentation, new underground right | ROUTT | 2026CW3010 ROUTT COUNTY Water Division: 6. DISTRICT COURT, WATER DIVISION SIX, STATE OF COLORADO, Routt County Combined Court, 1955 Shield Drive, Unit 200, Steamboat Springs, CO 80487. CONCERNING THE APPLICATION FOR WATER RIGHTS OF SIDNEY PEAK RANCH OWNERS’ AS… |
2026CW3011
|
change of water right | RIO BLANCO | 2026CW3011 RIO BLANCO COUNTY – WHITE RIVER. Mahogany Ranch, LLC, c/o Kevin L. Patrick, and John M. Sittler, Patrick, Miller & Noto, P.C., 229 Midland Ave., Basalt, CO 81621. (970) 920-1030. APPLICATION FOR CHANGE OF WATER RIGHT. Summary of Application: Applica… |
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.
Snowpack — no snow on the ground at 1 SNOTEL site — normal for the date; the snow year begins in October. Runoff outlook — Little Snake R nr Slater: even odds of at least 9 kAF over 06-01 to 07-31 — 17% 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 |
|---|---|---|---|---|---|
| Elkhead Divide | 8780 | 0.0 | — | — | — |
Little Snake R nr Slater — 06-01 to 07-31 volume, thousand acre-feet (chance the volume is AT LEAST this):
| 90% | 70% | 50% | 30% | 10% | Normal |
|---|---|---|---|---|---|
| 4 | 7 | 9 | 17 | 28 | 53 |
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: 9 parent disagreements, 5 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 19 streams, 10 agree. Know this water? Tell us →
| Stream | This site routes it to | DWR routes it to |
|---|---|---|
| Beaver Creek | the mainstem | Slater Creek |
| Jack Rabbit Creek | the mainstem | Slater Creek |
| First Creek | the mainstem | Slater Creek |
| Box Spring Creek | the mainstem | Willow Creek |
| Second Creek | Willow Creek | Slater Creek |
| Willow Creek | the mainstem | nan |
| Beaver Creek | the mainstem | Willow Creek |
| King Solomon Creek | the mainstem | Middle Fork Little Snake River |
Sizable streams DWR maps here that this network does not carry:
Dry Gulch (26 mi) · Thornburgh Gulch (9 mi) · Cantling Creek (8 mi) · Putt Creek (6 mi) · Fly Creek (6 mi)