Upper South Platte

Division 1 · Water District 23 · As of 2026-08-30 00:43 MDT

Full analysis

Upper South Platte on the ground — the ditches, wells, reservoirs and gages of Water District 23 · clicktap anything for its record

Snowpack — no snow on the ground at 3 SNOTEL sites — normal for the date; the snow year begins in October and typically peaks around May 2. Runoff outlook — Antero Reservoir Inflow: even odds of at least 5 kAF over 06-01 to 09-30 — 46% of a normal season, per NRCS, issued 2026-06-01 — the season’s final; new forecasts begin in January. Runoff outlook — Spinney Mountain Reservoir Inflow: even odds of at least 16 kAF over 06-01 to 09-30 — 37% of a normal season, per NRCS, issued 2026-06-01 — the season’s final; new forecasts begin in January. Runoff outlook — Elevenmile Canyon Reservoir Inflow: even odds of at least 18 kAF over 06-01 to 09-30 — 41% 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)	% of median	Typical peak
Buckskin Joe	11160	—	May 2 (12.6 in)
Michigan Creek	10700	—	April 26 (13.2 in)
Rough And Tumble	10420	—	April 24 (8.3 in)

Antero Reservoir Inflow — 06-01 to 09-30 volume, thousand acre-feet (chance the volume is AT LEAST this):

90%	70%	50%	30%	10%	Normal
2	4	5	6	7	11

Spinney Mountain Reservoir Inflow — 06-01 to 09-30 volume, thousand acre-feet (chance the volume is AT LEAST this):

90%	70%	50%	30%	10%	Normal
7	12	16	18	22	43

Elevenmile Canyon Reservoir Inflow — 06-01 to 09-30 volume, thousand acre-feet (chance the volume is AT LEAST this):

90%	70%	50%	30%	10%	Normal
8	14	18	21	25	45

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: 12 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 36 streams, 24 agree. Know this water? Tell us →

Stream	This site routes it to	DWR routes it to
Jarre Creek	the mainstem	Plum Creek
Bear Creek	the mainstem	West Plum Creek
West Plum Creek	the mainstem	Plum Creek
East Plum Creek	the mainstem	Plum Creek
West Cherry Creek	the mainstem	Cherry Creek
East Cherry Creek	the mainstem	Cherry Creek
Elk Creek	the mainstem	West Cherry Creek
Fourmile Creek	the mainstem	South Fork South Platte River

Sizable streams DWR maps here that this network does not carry:

Cache la Poudre River (127 mi) · Box Elder Creek (82 mi) · Big Thompson River (79 mi) · Clear Creek (66 mi) · Big Dry Creek (43 mi) · Saint Vrain Creek (32 mi) · Beebe Draw (30 mi) · Second Creek (25 mi)

⚠ This district is administered as part of the deployed South Platte product, whose modeled mainstem currently runs Denver gage → Greeley (the WD2 reach). The schematic and mass balance shown here are that combined product — this district's own upstream reach is not yet independently modeled. Calls, stations, and rights data ARE district-specific.

Reconstruct conditions as of

Evolution of the network

This year, in context

In the weeks around 2026-08-30 (the newest reading on file), flows at the 121 ranked gages are running at a median 78% of their own long-term norm for this window — 79 below a typical year, 42 at or above. Driest relative to its record: WALKER RESERVOIR OUTLET, ranking 1st lowest of 5 years.

How this comparison is made

Each gage's mean flow over the 3 days either side of 2026-08-30, 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 2026-08-31 06:07 from 268 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 268 gages with enough record, 16 are trending down and 15 up, and 21 carry a detected shift. The clearest is South Platte River near Lake George, its annual mean flow changing +7.54 cfs per decade (+8.2% of its median annual flow) over 96 years (p<0.0001). The other 233 show no clear signal either way. 1 transbasin gage meters 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).

What drought has cost here

Since 1991, federal crop insurance has paid $447,607,406 in drought-caused claims across Adams, Arapahoe, Boulder, Clear Creek, Denver, Douglas, Jefferson, Logan, Morgan, Park, Pueblo, Sedgwick, Washington, Weld counties — 38.4% of all insured crop losses there. The worst year was 2022 ($122,140,711).

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.

Gage	Trend	Change / decade cfs · % of median annual flow	Significance	Years	Changepoint
▸ South Platte River near Lake George PLAGEOCO	↑ increasing	+7.54 cfs +8.2%	p<0.001	96	~1983
▸ ⚠️ First Cr below Buckley Rd, at Rocky Mountain Arsenal FIRBUCCO	↑ increasing	+1.12 cfs +61.6%	p<0.001	33	~2012
▸ South Platte River above Elevenmile Reservoir PLAHARCO	↑ increasing	+7.62 cfs +8.0%	p<0.001	86	~1983
▸ ⚠️ Cherry Creek at Denver CHEDENCO	↑ increasing	+3.71 cfs +13.8%	p<0.001	67	~1982
▸ South Platte River at Henderson PLAHENCO	↑ increasing	+23.50 cfs +6.2%	p<0.001	99	~1968
▸ Cherry Creek below Cherry Creek Lake CHEBELCO	↑ increasing	+3.45 cfs +44.3%	p<0.001	72	~1982
▸ Gardener Ditch to Cherokee Power Plant GDRDITCO	↓ decreasing	-0.69 cfs	p<0.001	13	~2018
▸ North Fork South Platte River below Geneva Creek, at Grant NORGENCO	↑ increasing	+14.82 cfs +14.5%	p<0.001	60	~1964
▸ South Platte River at Fort Lupton PLALUPCO	↑ increasing	+26.22 cfs +7.1%	p<0.001	84	~1968
▸ Platteville Ditch Diversion PLADITCO	↓ decreasing	-6.13 cfs -23.8%	p<0.001	17	—
▸ Sand Creek at Mouth near Commerce City SANCOMCO	↓ decreasing	-8.93 cfs -20.1%	p<0.001	32	~2009
▸ South Platte River at South Platte PLASPLCO	↑ increasing	+10.06 cfs +2.5%	p=0.001	126	~1968
▸ Aurora Homestake Pipeline to Spinney Mountain Reservoir (Relief Valve) HOMSPRCO	↑ increasing	+0.38 cfs	p=0.002	11	~2017
▸ Cherokee Power Plant Return to South Platte River CHERTNCO	↓ decreasing	-1.00 cfs -74.8%	p=0.002	13	—
▸ ⇆ Roberts Tunnel at East Portal near Grant ROBTUNCO	↑ increasing	+9.86 cfs +13.1%	p=0.002	62	~1988
▸ Plum Creek near Louviers PLULOUCO	↑ increasing	+9.39 cfs +39.4%	p=0.002	44	~1968
▸ Jay Thomas Ditch JAYTOMCO	↓ decreasing	-1.67 cfs	p=0.003	11	—
▸ Lower Latham Augmentation Bypass LLABYPCO	↓ decreasing	-118.04 cfs -221.0%	p=0.004	13	~2017
▸ South Platte River at Waterton PLAWATCO	↓ decreasing	-6.53 cfs -5.5%	p=0.007	99	~1987
▸ Lower Latham Ditch LLADIVCO	↑ increasing	+10.65 cfs +16.6%	p=0.009	17	—
▸ South Platte River below Cheesman Reservoir PLACHECO	↑ increasing	+6.31 cfs +3.8%	p=0.011	101	~1981
▸ South Platte River below Strontia Springs PLASTRCO	↓ decreasing	-24.19 cfs -14.0%	p=0.017	43	—
▸ Ft. Saint Vrain Power Plant Return to St. Vrain Creek SVPPRTCO	↓ decreasing	-0.77 cfs -52.7%	p=0.020	11	—
▸ Meadow Island No 1 Ditch MEDIS1CO	↓ decreasing	-2.15 cfs -24.0%	p=0.029	15	—
▸ South Platte River at Englewood PLAENGCO	↓ decreasing	-28.40 cfs -16.6%	p=0.030	43	—
▸ Farmers Independent Ditch FRMDITCO	↓ decreasing	-2.43 cfs -6.9%	p=0.034	18	—
▸ Uvalda Intercept Bl 56th Av at Rocky Mountain Ars RMAUVACO	↑ increasing	+0.22 cfs +29.8%	p=0.036	19	—
▸ ⚠️ Cherry Creek near Melvin CHEMELCO	↓ decreasing	-5.89 cfs -73.5%	p=0.041	29	~1949
▸ South Platte River at 64th Ave. Commerce City PLASIXCO	↓ decreasing	-19.22 cfs -15.7%	p=0.042	44	—
▸ ⚠️ Sand Hill Lake Lm Outlet SHLLMOCO	↓ decreasing	-0.25 cfs	p=0.044	17	~2015
▸ Cherry Creek near Parker CHERRYCO	↑ increasing	+1.74 cfs +16.8%	p=0.044	34	—
▸ Burlington-Wellington Canal BURCANCO	↓ decreasing	-12.32 cfs -7.6%	p=0.047	34	—
▸ South Platte Supply Canal below Sand Lake near F SPSCFLCO	no clear trend	-1.05 cfs -13.7%	p=0.069	41	~1981
▸ ⚠️ North Fork South Platte River at South Platte NORSOPCO	no clear trend	+4.49 cfs +2.6%	p=0.363	68	~1964
▸ ⚠️ Boreas Pass Ditch at Boreas Pass BORDITCO	no clear trend	+0.00 cfs	p=0.941	83	~1962

⚠️ 6 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.

233 other gage(s) show no significant trend or changepoint (not shown).

2 of those show a significant trend once extended backwards from a retired neighbour's record: So. Platte River below Brush Cr. near Trumbull (101 yr, increasing); North Fork South Platte River at Grant (87 yr, increasing). Those are reconstructions, not measurements — each gage's page shows both.

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. 198 gage(s) and 689 structure(s) report in 2026, but structure reporting only reached half its modern level around ~1973. 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)
1890s	2	0
1900s	2	0
1910s	7	0
1920s	8	0
1930s	12	0
1940s	17	0
1950s	20	174
1960s	21	82
1970s	22	368
1980s	32	358
1990s	62	338
2000s	72	307
2010s	104	494
2020s	195	689

Mass-balance (network closure) trend

Structure divrec-history backfill coverage as of the last check: 21% of 2166 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 (1950–2025)

Mass-balance kinks computed for every summer month back to 1950 (1323 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.

SOUTH PLATTE RIVER AT FORT LUPTON, CO.: reach shifted from +86 cfs to +539 cfs summer mean (more gaining, p=0.000, 70 yr) [sedimentary plains/foothills: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records] [measurement-evolution caution: this shift co-moves with the growth of the gage/metering network (rho=0.6) -- part of it may be unaccounted water becoming accounted, not hydrologic change] [76 alluvial wells within 2 mi of the gage; pooled water table +1.1 ft (1929–2025, no_trend)]
FIRST CR BEL BUCKLEY RD, AT ROCKY MTN ARSENAL, CO: reach shifted from -30 cfs to -16 cfs summer mean (more gaining, p=0.049, 14 yr) [sedimentary plains/foothills: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records] [measurement-evolution caution: this shift co-moves with the growth of the gage/metering network (rho=0.53) -- part of it may be unaccounted water becoming accounted, not hydrologic change]

Groundwater now has its own tab: 8961 monitored well(s), water-table trends, stream corridors, and the advisory depletion screen.

Reservoirs now has its own tab: 284 reservoir(s), end-of-year storage back to 1950, click-to-chart histories.

Cross-gage pattern fingerprint

Over the 102-year window with full coverage (1925–2026), the dominant shared pattern across 3 gage(s) explains 82% 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 2026-07-25)

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.

DENVER FOOTHILLS PL 26 (diversion): -431.4 cfs (100% of that reach's correction)
CHEROKEE EXCHANGE PIPELINE (diversion): -143.6 cfs (83% of that reach's correction)
CHEESMAN RES (diversion): +116.7 cfs (100% of that reach's correction)
DENVER SPR4E LRF RELEASE (return): -28.7 cfs (17% of that reach's correction)
WALKING BEAR PUMP (diversion): +25.1 cfs (100% of that reach's correction)
STRONTIA SPRINGS DIVERSION DAM (diversion): +21.7 cfs (100% of that reach's correction)
LUPTON BOTTOM D WEST LATERAL AUG RETURN (return): +16.6 cfs (33% of that reach's correction)
AURORA EVERIST RESERVOIR 1 (diversion): +16.6 cfs (33% of that reach's correction)
PLATTEVILLE D CENTRAL AUG RT (return): +16.6 cfs (33% of that reach's correction)
ORR DRAIN (diversion): +13.1 cfs (12% 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	current	newest gage reading is 1 day(s) old
diversion record	stale	newest diversion record is 669 day(s) old (DWR publishes ~1 year in arrears)
structure coverage	sparse	21% of schematic structures have data

Independent check: PASS — 100.0000% agreement across 53,853 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 — 95.69% day-level agreement with USGS's own published records for the same gages, across 76 co-listed station(s) and 693,915 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.

268 gage(s) / 1,596,326 daily values (1895-07-01–2026-08-30); 1752 structure(s) with diversion records; 21881 with decreed rights. Methodology has not yet had independent expert review — treat every figure as an advisory screen, not an administrative or legal conclusion.

176,163 water-level measurements across 8961 monitored well(s) — 3556 alluvial, 2848 bedrock — plus 170 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 390 well(s) with enough record for a trend test: 157 declining, 53 rising.

Fastest-declining wells	Setting	ft / decade	Span	p
▸ CASTLE PINES A-1	bedrock	-307.81	28 yr	0.0
▸ DB-106 CPNMD A-2	bedrock	-266.68	32 yr	0.0
▸ DB-106 CPNMD A-3	bedrock	-258.69	32 yr	0.0
▸ DB-113 DEN TECH CNTR, SOUTH	bedrock	-256.67	31 yr	0.0
▸ JORDAN WELL	bedrock	-255.88	21 yr	0.0375
▸ DB-118 CASTLE ROCK WELL 14	bedrock	-253.52	35 yr	0.0003
▸ SC00606624ADA1	unknown	-251.12	22 yr	0.0006
▸ DB-113 DEN TECH CNTR, NORTH	bedrock	-235.24	31 yr	0.0002

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.

SOUTH PLATTE RIVER AT FORT LUPTON, CO.: 76 alluvial well(s) nearby; pooled water table +1.1 ft (1929–2025, no_trend, p=0.257). Glover screen: 3.2 cfs of nearby metered alluvial pumping → est. lagged depletion 2.8–3.1 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

FIRST CR BEL BUCKLEY RD, AT ROCKY MTN ARSENAL, CO: 62 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.

284 reservoir(s) with 254,263 storage measurement(s), 1950–2025. Basin storage as of 2024-10-31 (the record's own end — reservoir records publish ~annually): 419,331 AF across 85 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)
▸ ELEVEN MILE RES (2303965)	99,933	2024-10-31	—	—	dossier →
▸ CHEESMAN RES (8003550)	70,058	2024-10-31	—	—	dossier →
▸ STANDLEY RES (0203903)	35,226	2024-10-31	—	—	dossier →
▸ CHATFIELD RESERVOIR (0803514)	33,272	2024-10-31	—	—	dossier →
▸ SPINNEY MTN RESERVOIR (2304013)	30,953	2024-10-31	—	—	dossier →
▸ AURORA RES (0203379)	23,062	2024-10-31	—	—	dossier →
▸ ANTERO RES (2303904)	17,671	2024-10-31	—	—	dossier →
▸ 0803601	16,977	1958-06-01	—	—	dossier →

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)	% of median	Typical peak
Buckskin Joe	11160	—	May 2 (12.6 in)
Michigan Creek	10700	—	April 26 (13.2 in)
Rough And Tumble	10420	—	April 24 (8.3 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 (1999–2026)

A bad snow year here comes in two flavors (both called snow drought), and the river feels them differently. In 8 of the last 28 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 33% of median.

The snow never came: 2002, 2012, 2017, 2018, 2022, 2023, 2025, 2026.

Computed by this site from 3 SNOTEL sites’ full daily records (NRCS AWDB, back to 1999). 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 — Antero Reservoir Inflow

NRCS's final issue (2026-06-01) calls it even odds that at least 5 kAF arrives over 06-01 to 09-30 — 46% of a normal season; almost certainly at least 2, probably not more than 7. 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
2	4	5	6	7	11

Runoff outlook — Spinney Mountain Reservoir Inflow

NRCS's final issue (2026-06-01) calls it even odds that at least 16 kAF arrives over 06-01 to 09-30 — 37% of a normal season; almost certainly at least 7, probably not more than 22. Our own record at this gage shows 6 kAF so far this period. 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
7	12	16	18	22	43	6*

How good are these forecasts here? (1994–2025)

Grading every April issue against what the river then delivered, measured at this gage’s own record — 31 seasons: the median miss of the 50% forecast is 22%, with a high bias of 1%, and the observed volume landed inside the stated 10–90% band 74% 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 (1999–2026)

Across 28 measured years, the season’s water has loosely followed the April snowpack: a year opening April with 80% of median snow has typically gone on to deliver about 84% of a normal season (a snow-to-runoff elasticity of 0.8). This year opened April at 8% of median snow and delivered 53% of a normal season.

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.

Runoff outlook — Elevenmile Canyon Reservoir Inflow

NRCS's final issue (2026-06-01) calls it even odds that at least 18 kAF arrives over 06-01 to 09-30 — 41% of a normal season; almost certainly at least 8, probably not more than 25. 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
8	14	18	21	25	45

Decreed rights on this network run from 1859-03-01 to 2024-11-18. Of the 20 structures with a yield estimate, the median one’s senior right was in priority 55% of a median irrigation season and 35% in a dry one. 25 abandonment screens and 295 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: 28304 across 21881 structure(s); 1693 structure(s) carry 3253 court-case references. Advisory reading aids on public DWR data — not administrative or legal conclusions.

Is the river getting harder to divert from?

Over 2012–2025, none of the three measures of administration (days under call, calls set, seniority of the controlling call) shows a significant trend — the river is being administered about as it was.

The three measures, year by year

One row per whole calendar year inside the call record's coverage (14 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	309	220	1873-06-30
2015	330	155	1870-06-01
2016	366	203	1875-06-30
2017	365	296	1881-02-01
2018	365	334	1876-05-10
2019	365	289	1881-02-01
2020	366	249	1869-04-01
2021	349	227	1867-04-15
2022	365	291	1867-04-15
2023	331	255	1869-04-01
2024	366	213	1881-02-01
2025	365	333	1881-02-01

What the water is for — decade by decade

Of the water this district's structures diverted, the share whose decree includes municipal supply moved from 79% in the 1970s to 84% in the 2020s.

The decades, and how the attribution works

Every structure's recorded diversions, attributed to what its water was decreed FOR in that year. Colorado decrees are usually multi-use (“IRR MUN COM IND…”), so these are shares of water whose decree includes a use — non-exclusive, and they do not sum to 100%. A right that adds municipal use in 1988 counts toward it only after. Decades before this basin's modern reporting era are flagged: their records are thinner, not their rivers drier. Shares of recorded diverted volume, not of water rights or of acreage. A structure's water is attributed only to uses decreed by that year, so a later municipal decree cannot reach back and recolour earlier diversions. Families overlap -- a ditch decreed for irrigation and municipal supply counts in both -- so shares can sum past 100%. Volume the record cannot attribute is reported separately, never distributed.

Decade	Recorded AF	Structures	Includes municipal	Unattributed
1900s †	30	1	0%	0%
1910s †	3,142	1	100%	0%
1940s †	12,702	2	100%	0%
1950s †	4,931,345	241	73%	14%
1960s †	5,749,139	209	76%	23%
1970s	8,510,965	675	79%	16%
1980s	10,661,264	608	86%	7%
1990s	11,616,300	404	90%	6%
2000s	12,256,193	422	91%	11%
2010s	14,578,179	868	88%	22%
2020s	12,000,396	813	84%	22%

Why diversions stopped — call-based explanations

Sustained diversion stops matched to senior administrative calls.

TCVS-01 (0200525) DWR↗ stopped 2025-10-02 (5+ days) — call at FARMERS IRRIGATION CANAL [heuristic-strong]
TCVS-01 (0200525) DWR↗ stopped 2025-06-13 (50+ days) — call at NEW CACHE LA POUDRE CO DITCH [heuristic-strong]
MILLIKEN RESERVOIR PUMP NO 1 (0200582) DWR↗ stopped 2024-11-30 (36+ days) — call at NORTH STERLING CANAL [heuristic-strong, district-confirmed]
MILLIKEN RESERVOIR PUMP NO 1 (0200582) DWR↗ stopped 2024-08-31 (16+ days) — call at STERLING IRR CO DITCH 1 [heuristic-strong, district-confirmed]
TCVS-01 (0200525) DWR↗ stopped 2024-08-17 (26+ days) — call at WESTERN MUTUAL DITCH [heuristic-strong, district-confirmed]
TCVS-01 (0200525) DWR↗ stopped 2024-03-09 (6+ days) — call at BIJOU CANAL [heuristic-strong, district-confirmed]
WESTERN SEEP DITCH (0200537) DWR↗ stopped 2023-10-15 (16+ days) — call at JACKSON LAKE INLET DITCH curtailing 100% of its decreed rate [heuristic-strong, district-confirmed]

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
BURLINGTON D RIVER HEADGATE (0200802) DWR↗	1861-06-29	72.5% / 38.3%	0.0% / 0.0%
EVANS NO 2 DITCH (0200817) DWR↗	1871-10-05	35.2% / 20.1%	0.0% / 0.0%
UNION DITCH (0200828) DWR↗	1873-09-26	31.8% / 15.4%	0.0% / 0.0%
FULTON DITCH (0200808) DWR↗	1863-03-15	60.0% / 36.0%	0.0% / 0.0%
HIGHLINE CNL (0801004) DWR↗	1861-08-30	72.5% / 38.3%	0.0% / 0.0%
LAKE GEORGE INTAKE (2300693) DWR↗	1994-12-21	0.0% / 0.0%	0.0% / 0.0%
DENVER CONDUIT NO 20 (0801002) DWR↗	1860-12-28	91.8% / 72.0%	5.8% / 0.0%
DENVER FOOTHILLS PL 26 (0801017) DWR↗	1860-12-28	91.8% / 72.0%	0.0% / 0.0%
LOWER LATHAM DITCH (0200834) DWR↗	1869-05-12	39.0% / 21.5%	0.0% / 0.0%
0801016 DWR↗	1863-03-15	60.0% / 36.0%	11.4% / 0.0%
0200895 DWR↗	1970-05-13	0.0% / 0.0%	0.0% / 0.0%
BURLINGTON DITCH 2ND (0200865) DWR↗	1886-11-15	24.8% / 1.4%	24.8% / 1.4%

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 ~1973 — idleness that begins before then may be unreported use, not nonuse (flagged † below).

0801129 DWR↗ (1870-03-15, 1.0 cfs decreed): last active 1951 — 74 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1973) -- early absence of record is weak evidence of nonuse
2300988 DWR↗ (1878-08-01, 1.0 cfs decreed): last active 1951 — 74 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1973) -- early absence of record is weak evidence of nonuse
2300981 DWR↗ (1882-05-01, 10.0 cfs decreed): last active 1958 — 67 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1973) -- early absence of record is weak evidence of nonuse
2300543 DWR↗ (1876-12-31, 0.2 cfs decreed): last active 1962 — 63 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1973) -- early absence of record is weak evidence of nonuse
0200902 DWR↗ (1976-08-03, 100.0 cfs decreed): last active 1964 — 61 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1973) -- early absence of record is weak evidence of nonuse
0801462 DWR↗ (1861-08-30, 0.5 cfs decreed): last active 1968 — 57 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1973) -- early absence of record is weak evidence of nonuse
0200870 DWR↗ (1883-09-15, 13.0 cfs decreed): last active 1970 — 55 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1973) -- early absence of record is weak evidence of nonuse
2301504 DWR↗ (1983-07-31, 0.0 cfs decreed): last active 1970 — 55 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1973) -- early absence of record is weak evidence of nonuse
2301589 DWR↗ (1932-06-21, 0.1 cfs decreed): last active 1970 — 55 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1973) -- early absence of record is weak evidence of nonuse
2301639 DWR↗ (1961-09-02, 0.1 cfs decreed): last active 1970 — 55 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1973) -- early absence of record is weak evidence of nonuse

Compliance screens (295 advisory flags)

Screened 552 of 21881 structures with rights (762 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.

LORENZ TRUST 4-R12939 (0207026) DWR↗: Observed p99 daily rate 123904.7 cfs (max 123904.7) exceeds total decreed absolute 4.3 cfs across 12 recorded day(s).
LOWER PLUM CREEK DITCH LEFT IN STREAM (0802922) DWR↗: Observed p99 daily rate 338.8 cfs (max 475.5) exceeds total decreed absolute 5.0 cfs across 5146 recorded day(s).
MILTON RES (0203876) DWR↗: Observed p99 daily rate 256.0 cfs (max 602.1) exceeds total decreed absolute 50.0 cfs across 34963 recorded day(s).
ANTERO RES (2303904) DWR↗: Observed p99 daily rate 215.0 cfs (max 462.0) exceeds total decreed absolute 6.0 cfs across 11185 recorded day(s).
0200902 DWR↗: Observed p99 daily rate 141.0 cfs (max 141.0) exceeds total decreed absolute 100.0 cfs across 36 recorded day(s).
MONTGOMERY RES (2303962) DWR↗: Observed p99 daily rate 110.5 cfs (max 261.5) exceeds total decreed absolute 0.5 cfs across 40688 recorded day(s).
WHIPPLE DITCH (0200871) DWR↗: Observed p99 daily rate 94.6 cfs (max 143.0) exceeds total decreed absolute 6.0 cfs across 10045 recorded day(s).
SECTION NO 3 DITCH (0200830) DWR↗: Observed p99 daily rate 58.0 cfs (max 141.0) exceeds total decreed absolute 57.7 cfs across 33792 recorded day(s).
2300694 DWR↗: Observed p99 daily rate 50.0 cfs (max 50.0) exceeds total decreed absolute 35.4 cfs across 2574 recorded day(s).
EAST NERES CANAL (0200919) DWR↗: Observed p99 daily rate 49.6 cfs (max 185.9) exceeds total decreed absolute 25.0 cfs across 13610 recorded day(s).

Seniority (top structures by decreed rate)

Structure	Senior priority date	Rights	Decreed abs (cfs)	Decreed abs (AF)	Conditional?
BURLINGTON D RIVER HEADGATE (0200802) DWR↗	1861-06-29	52	5216.8	10000	yes
EVANS NO 2 DITCH (0200817) DWR↗	1871-10-05	17	1008.1	6565	yes
UNION DITCH (0200828) DWR↗	1873-09-26	11	744.3	620	yes
FULTON DITCH (0200808) DWR↗	1863-03-15	30	719.2	0	yes
HIGHLINE CNL (0801004) DWR↗	1861-08-30	13	628.3	0	—
LAKE GEORGE INTAKE (2300693) DWR↗	1994-12-21	1	600.0	0	—
DENVER CONDUIT NO 20 (0801002) DWR↗	1860-12-28	27	439.8	0	—
DENVER FOOTHILLS PL 26 (0801017) DWR↗	1860-12-28	25	413.0	0	yes
LOWER LATHAM DITCH (0200834) DWR↗	1869-05-12	7	329.6	0	yes
0801016 DWR↗	1863-03-15	3	300.0	0	—
0200895 DWR↗	1970-05-13	1	290.0	0	—
BURLINGTON DITCH 2ND (0200865) DWR↗	1886-11-15	1	250.0	0	—
BURLINGTON DITCH 3RD (0200866) DWR↗	1887-09-15	1	250.0	0	—
WESTERN MUTUAL DITCH (0200825) DWR↗	1866-05-05	8	242.3	0	yes
AURORA INTAKE (0801001) DWR↗	1863-12-30	18	230.0	474	yes

Recent inventory & legal-document changes

2026-08-29 — call set: LOWER LATHAM DITCH (39382)
2026-08-29 — call set: OGILVY DITCH (39386)
2026-08-29 — call set: LOWLINE DITCH (39383)
2026-08-29 — call released: 39379
2026-08-29 — call released: 39359
2026-08-28 — call set: COFFIN DAVIS DITCH (39369)
2026-08-28 — call set: PIONEER UNION DITCH (39366)
2026-08-28 — call set: WESTERN MUTUAL DITCH (39374)

Water-court filings this month (division-wide)

16 applications in the 2026-07 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 2026-09-30 (30 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 16 filings, with excerpts

Case	What it asks	County	Excerpt
`2026CW3054`	new underground right	—	CASE NUMBER 2026CW3054 BRIAN ROBERT WEISSEG LIVING TRUST DATED MAY 15, 2011, AMANDA VINTON WEISSEG LIVING TRUST DATED DECEMBER 10, 2014 , c/o Brian Robert Weisseg and Amanda Vinton Weisseg, c/o John P. Justus, CURTIS, JUSTUS, & ZAHEDI, LLC, 1333 W. 120th Ave.,…
`2026CW3062`	—	—	CASE NUMBER 2026CW3062 PRI #2, LLC (“Applicant”), 2138 Flying Horse Club Drive, Colorado Springs, Colorado 80921. Please forward all correspondence or inquiries regarding this matter to Attorneys for Applicant: Alan G. Hill; Ashley Pollock Zahedi; Nicoli R. Bo…
`2026CW3106`	—	—	CASE NUMBER 2026CW3106 STANLEY E. KELLOGG, PO Box 1935 Grand Lake, CO 80447. Direct all pleadings and correspondence to Chris D. Cummins and Sedona E. Chavez, Monson, Cummins, Shohet & Farr, LLC, 13511 Northgate Estates Dr., Ste. 250, Colorado Springs, CO 8092…
`2026CW3107`	—	—	CASE NUMBER 2026CW3107 Colorado Division of Parks and Wildlife - Order for Change of Venue to WD2.…
`2026CW3108` 0107223 0107980 0107981	reasonable diligence, make absolute	—	CASE NUMBER 2026CW3108 WEITZEL LAND LLC , 28271 Road L, Brush, Colorado 80723, Lawrence Custer Grasmick Jones & Donovan LLP Attorneys for Applicant, Weitzel Land LLC Ryan M. Donovan, #44435 Regan M. O’Donnell, #62937 APPLICATION TO MAKE CONDITIONAL WATER RIGHT…
`2026CW3109`	change of water right	—	CASE NUMBER 2026CW3109 ROBERT AND ALLISON JOHNSON, 1100 Shoreline Dr, Windsor, CO 80550, 970-581-2994. Please send all further pleadings to: Daniel K. Brown, Esq. and Whitney Phillips, Esq. Fischer, Brown, Bartlett, Larsen & Irby, P.C., 1319 E. Prospect Road, …
`2026CW3110`	reasonable diligence	—	CASE NUMBER 20 26CW3110 (Case No. 19CW3038, 09CW279) THE CITY OF AURORA , COLORADO, a municipal corporation of the Counties of Adams, Arapahoe and Douglas acting by and through its Utility Enterprise (“Aurora" or "Applicant"). APPLICATION FOR A FINDING OF REAS…
`2026CW3111`	—	IN WELD	CASE NUMBER 2026CW3111 CONCERNING THE APPLICATION FOR WATER RIGHTS OF THE COLORADO DIVISION OF PARKS AND WILDLIFE AND THE PARKS AND WILDLIFE COMMISSION, IN WELD COUNTY ; Colorado Division of Parks and Wildlife and the Parks and Wildlife Commission (“CPW”), 606…
`2026CW3112` 0904297	reasonable diligence	ASONABLE DILIGENCE IN JEFFERSON	CASE NUMBER 2026CW3112 (2019CW3233, 2013CW3067, 2002CW138) APPLICATION FOR FINDING OF REASONABLE DILIGENCE IN JEFFERSON COUNTY. RED ROCKS COUNTRY CLUB c/o Richard J. Mehren, Cameron J. Abatti, Moses, Wittemyer, Harrison and Woodruff, P.C., 2595 Canyon Boulevar…
`2026CW3113`	change of water right	ATE POINT OF DIVERSION IN WELD	CASE NUMBER 20 26CW3113 APPLICATION FOR CHANGE OF WATER RIGHT TO ADD ALTERNATE POINT OF DIVERSION IN WELD COUNTY. 1. Name and Address of Applicant . GWIP, LLC, 252 Clayton Street, Fourth Floor, Denver, Colorado 80206. Copies of all pleadings and other correspo…
`2026CW3114`	reasonable diligence	THE	CASE NUMBER 2026CW3114 CONCERNING THE APPLICATION FOR WATER RIGHTS OF THE COUNTY OF BOULDER (SUCCESSOR TO CEMEX, INC.) APPLICATION FOR FINDING OF REASONABLE DILIGENCE IN BOULDER COUNTY . Attorneys for applicant: Andrea L. Benson, Esq., Reg. No. 33176, Gilbert …
`2026CW3115`	plan for augmentation, new underground right	—	CASE NUMBER 2026CW3115 DORADO AND RAMIRO ROSALES , 14551 Imboden Rd, Hudson, CO 80642. James J Petrock, John D Buchanan, Hayes Poznanovic Korver LLC, 700 17 th Street, Suite 1800, Denver, CO 80202. APPLICATION FOR UNDERGROUND WATER RIGHTS FROM NONTRIBUTARY AND…
`2026CW3116`	new underground right	—	CASE NUMBER 2026CW3116 ROBERT D HOFFMANN AND AMY LEE HOFFMANN , 4962 N State Highway 67, Sedalia, CO, 80135. Philip E. Lopez, Eric K. Trout, Fairfield and Woods, P.C., 1801 California Street, Suite 2600, Denver, CO, 80202. APPLICATION FOR UNDERGROUND WATER RIG…
`2026CW3117`	reasonable diligence	—	CASE NUMBER 20 26CW3117 LOWER POUDRE AUGMENTATION COMPANY, THE NEW CACHE LA POUDRE IRRIGATING COMPANY, AND THE CACHE LA POUDRE RESERVOIR COMPANY, 33040 Railroad Avenue, P.O. Box 104. Lucerne, CO 80646, (970) 352-0222. Please send all further pleadings to: Bren…
`2026CW3118`	—	DOUGLAS	CASE NUMBER 2026CW3118 ROBERT H BASTIAANS AND JANICE A YUVAN, 10440 Meadow Run, Parker, CO, 80134. Philip E. Lopez, Eric K. Trout, Fairfield and Woods, P.C., 1801 California Street, Suite 2600, Denver, CO, 80202. APPLICATION FOR AMENDMENT OF A PRIOR DECREE IN …
`2026CW8`	new storage right	RIGHT IN CLEAR CREEK	CASE NUMBER 2026CW8 JONELLE AND JOHN PAUL HADDAD, P.O. Box 139, Dumont, CO 80436. 720 -951-1183. APPLICATION FOR ABSOLUTE/CONDITIONAL WATER STORAGE RIGHT IN CLEAR CREEK COUNTY. Date of original decree: 07-30-20 in case 20CW7, WD1. Haddad Pond fka Duke Pond loc…

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
CENTRAL COLORADO WATER CONSERVANCY DISTRICT - GMSD - 23CW3086	37-92-308(4) PLAN PENDING COURT APPLICATION	Approved	2026-06-30	—	plan file
GREELEY HAREN RECHARGE POND CREDIT	37-92-308(5) PLANS LESS THAN 5 YEARS	Approved	2026-06-30	—	plan file
CENTRAL COLORADO WATER CONSERVANCY DISTRICT - GWMSD - 24CW3078	37-92-308(4) PLAN PENDING COURT APPLICATION	Approved	2026-08-31	—	plan file
CENTRAL COLORADO WATER CONSERVANCY DISTRICT - GWMSD - 25CW3070	37-92-308(4) PLAN PENDING COURT APPLICATION	Approved	2026-08-31	—	plan file
FLYING J RANCH	37-92-308(7) PLAN EMERGENCY	Approved	2026-09-09	—	plan file
GILCREST, TOWN OF	37-92-308(7) PLAN EMERGENCY	Approved	2026-10-05	—	plan file
EVANS MINING RESOURCE	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-10-31	0202687	plan file
GSL SAND AND GRAVEL MINE	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-10-31	0202584	plan file
CITY OF ENGLEWOOD CHATFIELD RESERVOIR OUTLET MANIFOLD TEMPORARY CLOSURE	37-92-308(7) PLAN EMERGENCY	Approved	2026-11-26	—	plan file
BRIGHTON PIT M77436 -56993-F SEE ALSO 4848 READY MIXED CONCRETE - NORTH TOWER PIT M77436	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	—	plan file
CENTRAL CO WATER CONSERVANCY DIST. AND GROUND MANAGEMENT SUBDIST. OF THE CENTRAL CO WATER CONSERVANCY DIST.	37-92-308(4) PLAN PENDING COURT APPLICATION	Approved	2026-12-31	—	plan file
CHAVERS MINING RESOURCE	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	0202654	plan file
DPG GRAVEL PIT	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	0302587	plan file
DURHAM S&G CO PIT	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	0303029	plan file
EWING GRAVEL MINE	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	—	plan file
FULTON LAKES AKA JERONIMUS PIT	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	—	plan file
HAZELTINE PIT	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	—	plan file
INOUYE GRAVEL MINE	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	—	plan file
MORTON LAKES PIT	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	0203053	plan file
PLATTE VALLEY PIT	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	—	plan file
SHORES GRAVEL PIT	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	0505500	plan file
SPEER MINING RESOURCE	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	—	plan file
TUCSON SOUTH PIT	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	—	plan file
WATTENBERG PIT	37-90-137(11) GRAVEL PIT PLAN	Approved	2026-12-31	—	plan file
ADAMS COUNTY BOARD OF COMMISSIONERS	37-92-308(5) PLANS LESS THAN 5 YEARS	Approved	2027-01-31	—	plan file

Showing 25 of 64 plans — the rest are on DWR’s register.

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

Administration number

DWR administration numbers encode appropriation and adjudication dates; lower is more senior.

Gage	Station	Avg cfs Aug 17–Aug 23	% Hist Median	Rank	Δ1wk	Δ4wk	Yrs	Status
FIRBUCCO	FIRST CR BEL BUCKLEY RD, AT ROCKY MTN ARSENAL, CO	3.6	361%	100	-3	+3	34.2	OK
BIGWESCO	BIG DRY CREEK AT WESTMINSTER, COLO	0.5	2%	0	-0	-2	37.7	OK
PLASIXCO	SOUTH PLATTE R AT 64TH AVE. COMMERCE CITY, CO.	100.3	49%	22	-130	+30	44.3	OK
PLAHENCO	SOUTH PLATTE RIVER AT HENDERSON, CO	242.9	67%	26	-151	+88	100.1	OK
PLALUPCO	SOUTH PLATTE RIVER AT FORT LUPTON, CO.	177.7	55%	16	-61	+97	89.3	OK
SANCOMCO	SAND CREEK AT MOUTH NR COMMERCE CITY,CO	39.2	82%	40	-6	+32	33.3	OK
BIGDAFCO	BIG DRY CREEK AT MOUTH NEAR FORT LUPTON	15.3	47%	0	+2	-0	34.6	OK
EVANS2CO	EVANS #2 DITCH	33.4	28%	0	-14	+33	33.5	OK
WESDITCO	WESTERN MUTUAL DITCH AKA HEWES COOK	66.9	75%	22	+27	+51	29.9	SHORT_RECORD
METSEWCO	METRO SEWER EFFLUENT AT DENVER	179.0	99%	3	-1	+8	5.2	SHORT_RECORD
BURCANCO	BURLINGTON-WELLINGTON CANAL	30.9	54%	0	-13	+7	37.3	OK
FULDITCO	FULTON DITCH AT HEADGATE NEAR THORNTON	80.8	98%	42	-2	-8	27.4	SHORT_RECORD
FRMDITCO	FARMERS INDEPENDENT DITCH	62.3	97%	21	-3	+5	18.6	SHORT_RECORD
SECDITCO	SECTION NO 3 DITCH	24.9	107%	54	-8	-8	17.8	SHORT_RECORD
SHLINLCO	SAND HILL LAKE (INLET)	0.0	0%	0	-0	+0	18.3	SHORT_RECORD
SHLOUTCO	SAND HILL LAKE (OUTLET)	0.0	0%	0	-3	+0	18.1	SHORT_RECORD
BRTDITCO	BRANTNER DITCH	39.8	105%	56	-1	+3	17.8	SHORT_RECORD
BRGDITCO	BRIGHTON DITCH	18.7	84%	27	-1	-2	17.8	SHORT_RECORD
LPBEASCO	LUPTON BOTTOM DITCH EAST AUG RET	4.9	99%	49	-0	-0	17.7	SHORT_RECORD
LPBWESCO	LUPTON BOTTOM DITCH WEST AUG RET	1.7	77%	17	+0	-0	17.8	SHORT_RECORD
MDWDITCO	MEADOW ISLAND #2 AND BEEMAN COMBINED	48.2	103%	67	+31	+37	17.3	SHORT_RECORD
SHLLMOCO	SAND HILL LAKE LM OUTLET	0.0	0%	0	+0	-0	17.8	SHORT_RECORD
LLADIVCO	LOWER LATHAM DITCH	106.5	60%	0	+7	+27	17.3	SHORT_RECORD
MEDIS1CO	MEADOW ISLAND NO 1 DITCH	20.1	92%	0	+12	+9	16.7	SHORT_RECORD
PLADITCO	PLATTEVILLE DITCH DIVERSION	54.2	100%	47	+4	+7	17.4	SHORT_RECORD
LLABYPCO	LOWER LATHAM AUGMENTATION BYPASS	0.0	0%	0	+0	+0	16.0	SHORT_RECORD
UNION2CO	UNION DITCH NEAR MILLIKEN	74.4	72%	0	+9	+15	17.4	SHORT_RECORD
NGLNLBCO	NORTHGLENN LUPTON BOTTOM AUG RETURN	0.5	18%	0	+0	-0	5.8	SHORT_RECORD
PLARTNCO	PLATTEVILLE DITCH CENTRAL AUG RT	1.5	68%	0	-0	+0	6.4	SHORT_RECORD
CENTLBCO	CCWCD LUPTON BOTTOMS 14.5 AUG RTN	3.8	59%	0	+0	-0	8.0	SHORT_RECORD
CENFULCO	CCWCD FULTON DITCH AUG RTN	1.4	50%	0	+0	+0	8.1	SHORT_RECORD
CHERTNCO	CHEROKEE POWER PLANT RETURN TO SOUTH PLATTE RIVER	0.0	0%	4	-0	+0	13.5	SHORT_RECORD
GDRDITCO	GARDENER DITCH TO CHEROKEE POWER PLANT	0.0	0%	0	+0	+0	13.4	SHORT_RECORD
DWRDECCO	DENVER WATER REUSE DELIVERY TO CHEROKEE POWER PLANT	4.1	0%	68	-0	-2	13.5	SHORT_RECORD
SPPUMPCO	SOUTH PLATTE PUMP STATION DELIVERY TO CHEROKEE POWER PLANT	0.0	0%	0	+0	+0	13.5	SHORT_RECORD
SANABDCO	SAND CREEK ABOVE BURLINGTON DITCH NEAR COMMERCE CITY, CO	49.6	371%	100	-26	+42	10.6	SHORT_RECORD
UAUGRTCO	UNION DITCH AUGMENTATION RETURN	1.5	56%	28	+1	+1	11.8	SHORT_RECORD
SVPPRTCO	FT. SAINT VRAIN POWER PLANT RETURN TO ST. VRAIN CREEK	1.8	107%	58	-0	+1	11.6	SHORT_RECORD
JAYTOMCO	JAY THOMAS DITCH	0.0	0%	0	+0	+0	11.5	SHORT_RECORD
BNSVPPCO	BEEMAN DITCH DELIVERY TO FORT ST. VRAIN POWER PLANT	6.5	68%	13	+6	+5	11.6	SHORT_RECORD