North Fork/Tribs.

Division 4 · Water District 40

Auto-mapped

North Fork/Tribs. on the ground — the ditches, wells, reservoirs and gages of Water District 40 · 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 April 4. Runoff outlook — Paonia Reservoir Inflow: even odds of at least 2 kAF over 06-01 to 06-30 — 15% of a normal season, per NRCS, issued 2026-06-01 — the season’s final; new forecasts begin in January. Runoff outlook — NF Gunnison R nr Somerset: even odds of at least 21 kAF over 06-01 to 07-31 — 23% of a normal season, per NRCS, issued 2026-06-01 — the season’s final; new forecasts begin in January. Runoff outlook — Surface Ck at Cedaredge: even odds of at least 1 kAF over 06-01 to 07-31 — 26% 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)	% of median	Typical peak
Mc Clure Pass	8760	0.0	—	April 4 (16.6 in)
Overland Res.	9890	0.1	—	April 5 (12.4 in)
Park Reservoir	9990	0.0	—	April 26 (27.4 in)

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

90%	70%	50%	30%	10%	Normal
0	1	2	4	7	13

NF Gunnison R nr Somerset — 06-01 to 07-31 volume, thousand acre-feet (chance the volume is AT LEAST this):

90%	70%	50%	30%	10%	Normal
12	17	21	38	62	91

Surface Ck at Cedaredge — 06-01 to 07-31 volume, thousand acre-feet (chance the volume is AT LEAST this):

90%	70%	50%	30%	10%	Normal
1	1	1	2	4	5

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: 14 parent disagreements, 3 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 29 streams, 15 agree. Know this water? Tell us →

Stream	This site routes it to	DWR routes it to
Kiser Creek	the mainstem	Ward Creek
Ward Creek	the mainstem	Tongue Creek
Youngs Creek	the mainstem	Kiser Creek
Currant Creek	the mainstem	Gunnison River
Hubbard Creek	the mainstem	North Fork Gunnison River
Dirty George Creek	the mainstem	Tongue Creek
Happy Hollow Creek	the mainstem	Tongue Creek
Leroux Creek	the mainstem	North Fork Gunnison River

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

Milk Creek (8 mi) · Marcott Creek (6 mi) · Caesar Creek (3 mi)

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.

Reconstruct conditions as of

Evolution of the network

This year, in context

In the weeks around 2026-07-06 (the newest reading on file), flows at the 48 ranked gages are running at a median 100% of their own long-term norm for this window — 23 below a typical year, 25 at or above. Driest relative to its record: SMITH FORK NEAR LAZEAR, CO., ranking 3rd lowest of 26 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 19:59 from 81 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 81 gages with enough record, 0 are trending down and 1 up, and 1 carries a detected shift. The clearest is Tongue Creek at Cory, its annual mean flow changing +25.53 cfs per decade (+66.5% of its median annual flow) over 20 years (p=0.0026). The other 80 show no clear signal either way.

What drought has cost here

Since 2011, federal crop insurance has paid $8,457 in drought-caused claims across Delta, Gunnison, Montrose counties — 0.0% of all insured crop losses there. The worst year was 2018 ($5,315).

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
▸ ⚠️ Tongue Creek at Cory TONCORCO	↑ increasing	+25.53 cfs +66.5%	p=0.003	20	~1977

⚠️ 1 gage 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.

80 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. 54 gage(s) and 609 structure(s) report in 2026, but structure reporting only reached half its modern level around ~1970. 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	2	0
1920s	2	0
1930s	2	0
1940s	8	0
1950s	7	0
1960s	9	0
1970s	5	636
1980s	13	700
1990s	10	676
2000s	19	693
2010s	20	670
2020s	24	615

Mass-balance (network closure) trend

Structure divrec-history backfill coverage as of the last check: 13% of 3705 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 (488 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.

TONGUE CREEK AT CORY, CO: reach shifted from -18 cfs to +33 cfs summer mean (more gaining, p=0.006, 23 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization] [measurement-evolution caution: this shift co-moves with the growth of the gage/metering network (rho=0.49) -- part of it may be unaccounted water becoming accounted, not hydrologic change]

Groundwater now has its own tab: 99 monitored well(s), water-table trends, stream corridors, and the advisory depletion screen.

Reservoirs now has its own tab: 209 reservoir(s), end-of-year storage back to 1970, click-to-chart histories.

Cross-gage pattern fingerprint

Over the 51-year window with full coverage (1976–2026), the dominant shared pattern across 3 gage(s) explains 87% 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 2026-07-06)

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.

DRY FK 11 (diversion): +10.0 cfs (14% of that reach's correction)
COAL CREEK POND NO 3 (diversion): +10.0 cfs (14% of that reach's correction)
COAL CREEK POND NO. 2 (diversion): +10.0 cfs (14% of that reach's correction)
SNOWSHOE PIPELINE (diversion): +10.0 cfs (14% of that reach's correction)
SNOWSHOE DAM AND RES (diversion): +10.0 cfs (14% of that reach's correction)
BERG DITCH (diversion): +10.0 cfs (14% of that reach's correction)
CRYSTAL MEADOWS POND NO. 1 (diversion): +10.0 cfs (14% of that reach's correction)
DREYFUS RESERVOIR (diversion): -3.8 cfs (8% of that reach's correction)
CARBONATE CAMP RES NO 4 (diversion): -3.8 cfs (8% of that reach's correction)
CARBONATE CAMP RES NO 2 (diversion): -3.8 cfs (8% of that reach's correction)

Data provenance & quality

Where these numbers come from and how far they can be trusted. Grade D (2/6 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	stale	newest diversion record is 669 day(s) old (DWR publishes ~1 year in arrears)
structure coverage	sparse	13% of schematic structures have data

Independent check: PASS — 100.0000% agreement across 374,783 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 — 99.85% day-level agreement with USGS's own published records for the same gages, across 29 co-listed station(s) and 252,458 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.

81 gage(s) / 364,969 daily values (1917-10-01–2026-07-06); 1210 structure(s) with diversion records; 4661 with decreed rights. Methodology has not yet had independent expert review — treat every figure as an advisory screen, not an administrative or legal conclusion.

1,355 water-level measurements across 99 monitored well(s) — 47 alluvial, 10 bedrock — plus 3 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 11 well(s) with enough record for a trend test: 2 declining, 2 rising.

Fastest-declining wells	Setting	ft / decade	Span	p
▸ WS-47	bedrock	-8.07	30 yr	0.0021
▸ WS-27	bedrock	-1.82	31 yr	0.0077

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.

209 reservoir(s) with 56,824 storage measurement(s), 1970–2025. Basin storage as of 2024-10-31 (the record's own end — reservoir records publish ~annually): 18,978 AF across 169 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)
▸ CRAWFORD RESERVOIR (4003553)	3,521	2024-10-31	—	—	dossier →
▸ FRUITLAND RESERVOIR (4003395)	1,872	2024-10-31	—	—	dossier →
▸ PARK RESERVOIR (4003355)	1,755	2024-10-31	—	—	dossier →
▸ EGGLESTON LAKE (4003312)	1,585	2024-10-31	—	—	dossier →
▸ PAONIA RESERVOIR (4003416)	1,138	2024-10-31	—	—	dossier →
▸ DEEP WARD LAKE RES (4003310)	1,001	2024-10-31	—	—	dossier →
▸ LEON LAKE RESERVOIR (4004520)	965	2013-10-31	—	—	dossier →
▸ LAKE BRENNAND RES (4003396)	498	2024-10-17	—	—	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)	SWE (in)	% of median	Typical peak
Mc Clure Pass	8760	0.0	—	April 4 (16.6 in)
Overland Res.	9890	0.1	—	April 5 (12.4 in)
Park Reservoir	9990	0.0	—	April 26 (27.4 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 drought), and the river feels them differently. In 9 of the last 48 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 51% of median.

The snow never came: 1990, 1999, 2002, 2012, 2013, 2015, 2018, 2025, 2026.

Computed by this site from 3 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 — Paonia Reservoir Inflow

NRCS's final issue (2026-06-01) calls it even odds that at least 2 kAF arrives over 06-01 to 06-30 — 15% of a normal season; almost certainly at least 0, 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
0	1	2	4	7	13

Runoff outlook — NF Gunnison R nr Somerset

NRCS's final issue (2026-06-01) calls it even odds that at least 21 kAF arrives over 06-01 to 07-31 — 23% of a normal season; almost certainly at least 12, probably not more than 62. Our own record at this gage shows 23 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
12	17	21	38	62	91	23

How good are these forecasts here? (1973–2025)

Grading every April issue against what the river then delivered, measured at this gage’s own record — 52 seasons: the median miss of the 50% forecast is 16%, with a high bias of 2%, and the observed volume landed inside the stated 10–90% band 81% 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 (1979–2025)

Across 47 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 65% of a normal season (a snow-to-runoff elasticity of 1.4).

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 — Surface Ck at Cedaredge

NRCS's final issue (2026-06-01) calls it even odds that at least 1 kAF arrives over 06-01 to 07-31 — 26% of a normal season; almost certainly at least 1, probably not more than 4. Our own record at this gage shows 1 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
1	1	1	2	4	5	1

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 15%, with a high bias of 6%, and the observed volume landed inside the stated 10–90% band 91% of the time (a calibrated forecast would say 80%).

What April snow has meant for this river (1979–2025)

Across 47 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 73% of a normal season (a snow-to-runoff elasticity of 1.4).

Decreed rights on this network run from 1878-07-31 to 2025-06-30. Of the 20 structures with a yield estimate, the median one’s senior right was in priority 7% of a median irrigation season and 0% in a dry one. 25 abandonment screens and 477 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: 7023 across 4661 structure(s); 812 structure(s) carry 3 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	0	0	—
2015	277	127	1885-08-11
2016	366	108	1890-11-17
2017	319	94	1888-01-23
2018	291	160	1882-06-01
2019	319	93	1888-01-25
2020	246	141	1881-12-17
2021	275	103	1883-05-05
2022	365	93	1884-11-01
2023	277	59	1898-10-15
2024	275	56	1883-06-01
2025	365	100	1884-11-01

Why diversions stopped — call-based explanations

Sustained diversion stops matched to senior administrative calls.

CRYSTAL VALLEY DITCH (4000533) DWR↗ stopped 2024-08-29 (15+ days) — call at MINNESOTA CANAL curtailing 100% of its decreed rate [heuristic-strong]
FREEMAN DITCH NO 2 (4000547) DWR↗ stopped 2024-08-29 (31+ days) — call at MINNESOTA CANAL curtailing 100% of its decreed rate [heuristic-strong]
DIAMOND JOE DITCH (4000537) DWR↗ stopped 2024-07-07 (53+ days) — call at NORTH FORK ORCHARD COMPANY DITCH curtailing 100% of its decreed rate [heuristic-strong]
DYER FORK DITCH (4000543) DWR↗ stopped 2024-07-07 (54+ days) — call at NORTH FORK ORCHARD COMPANY DITCH curtailing 100% of its decreed rate [heuristic-strong]
FREEMAN DITCH NO 1 (4000548) DWR↗ stopped 2024-07-07 (85+ days) — call at NORTH FORK ORCHARD COMPANY DITCH curtailing 100% of its decreed rate [heuristic-strong]
ASPEN CREEK DITCH (4000510) DWR↗ stopped 2024-06-16 (137+ days) — call at GROVE DITCH curtailing 100% of its decreed rate [heuristic-strong]
CRYSTAL VALLEY DITCH (4000533) DWR↗ stopped 2024-05-28 (13+ days) — call at COAL CREEK DITCH curtailing 100% of its decreed rate [heuristic-strong]
ASPEN DITCH (4000508) DWR↗ stopped 2024-04-21 (18+ days) — call at A. A. SMITH DITCH curtailing 100% of its decreed rate [heuristic-strong]
CRAWFORD CLIPPER DITCH (4000500) DWR↗ stopped 2024-04-07 (6+ days) — call at ALBUSH DITCH curtailing 69% of its decreed rate [heuristic-partial]
ANDERSON DITCH (4000507) DWR↗ stopped 2023-09-21 (216+ days) — call at MINNESOTA CANAL curtailing 100% of its decreed rate [heuristic-strong]
FREEMAN DITCH NO 2 (4000547) DWR↗ stopped 2023-09-04 (17+ days) — call at DEER TRAIL 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
FRUITLAND CANAL (4000549) DWR↗	1901-05-17	6.3% / 0.0%	0.0% / 0.0%
FIRE MOUNTAIN CANAL (4001133) DWR↗	1896-09-14	8.2% / 0.0%	0.0% / 0.0%
COTTONWOOD CREEK ISF (4004193) DWR↗	2023-07-19	0.0% / 0.0%	0.0% / 0.0%
CRAWFORD CLIPPER DITCH (4000500) DWR↗	1885-10-19	12.6% / 0.0%	0.0% / 0.0%
OVERLAND DITCH (TERROR CREEK) (4001739) DWR↗	1893-08-01	6.3% / 0.0%	0.0% / 0.0%
SMITH FORK FEEDER CANAL (4000605) DWR↗	1946-09-03	0.0% / 0.0%	0.0% / 0.0%
ASPEN CANAL (4000509) DWR↗	1946-09-03	0.0% / 0.0%	0.0% / 0.0%
SURFACE CREEK DITCH (WARD) (4000661) DWR↗	1886-07-26	12.6% / 0.0%	0.0% / 0.0%
LEROUX CREEK DITCH (4000926) DWR↗	1883-08-11	31.3% / 0.0%	0.0% / 0.0%
OVERLAND DITCH (LEROUX CREEK) (4000944) DWR↗	1883-08-11	31.3% / 0.0%	0.0% / 0.0%
GRANDVIEW CANAL (4000503) DWR↗	1895-03-28	6.3% / 0.0%	0.0% / 0.0%
ALFALFA DITCH (4000751) DWR↗	1881-12-17	71.3% / 10.7%	0.0% / 0.0%

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 ~1970 — idleness that begins before then may be unreported use, not nonuse (flagged † below).

TUCKER DITCH & W WHEEL (4001261) DWR↗ (1899-04-01, 2.0 cfs decreed): last active 1970 — 54 years idle
JAMES KENNICOTT W SIDE D (4001405) DWR↗ (1888-05-15, 1.0 cfs decreed): last active 1971 — 53 years idle
WOMACK RESERVOIR NO. 3 (4003548) DWR↗ (1898-08-26, 0.0 cfs decreed): last active 1971 — 53 years idle
PICKETT CORRAL DITCH (4000897) DWR↗ (1919-04-15, 1.1 cfs decreed): last active 1972 — 52 years idle
WILBANKS DITCH (4001285) DWR↗ (1884-04-01, 0.5 cfs decreed): last active 1972 — 52 years idle
ROCK DITCH (4000597) DWR↗ (1890-07-01, 3.2 cfs decreed): last active 1973 — 51 years idle
WELL DITCH (4000618) DWR↗ (1890-07-01, 3.9 cfs decreed): last active 1973 — 51 years idle
COTTONWOOD DITCH (4000635) DWR↗ (1912-04-01, 0.5 cfs decreed): last active 1973 — 51 years idle
JEFFERS GULCH W W DITCH (4001283) DWR↗ (1896-04-01, 4.0 cfs decreed): last active 1973 — 51 years idle
CEDAREDGE FISH HATCHERY (4001502) DWR↗ (1921-01-01, 2.0 cfs decreed): last active 1973 — 51 years idle

Compliance screens (477 advisory flags)

Screened 841 of 4661 structures with rights (1031 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.

BONA FIDE DITCH (4000863) DWR↗: Observed p99 daily rate 73.6 cfs (max 80.0) exceeds total decreed absolute 65.0 cfs across 25375 recorded day(s).
RELIEF DITCH (4000900) DWR↗: Observed p99 daily rate 69.8 cfs (max 80.0) exceeds total decreed absolute 51.0 cfs across 25459 recorded day(s).
NORTH DELTA CANAL (4000891) DWR↗: Observed p99 daily rate 63.9 cfs (max 72.2) exceeds total decreed absolute 51.2 cfs across 22450 recorded day(s).
HARTLAND DITCH (4000879) DWR↗: Observed p99 daily rate 60.0 cfs (max 90.0) exceeds total decreed absolute 47.4 cfs across 23839 recorded day(s).
SURFACE CREEK DITCH (KISER) (4000662) DWR↗: Observed p99 daily rate 50.0 cfs (max 100.0) exceeds total decreed absolute 10.4 cfs across 34119 recorded day(s).
STULL DITCH (4000942) DWR↗: Observed p99 daily rate 48.5 cfs (max 68.0) exceeds total decreed absolute 10.8 cfs across 26349 recorded day(s).
STELL BUTTES ENLG DITCH (4000820) DWR↗: Observed p99 daily rate 46.0 cfs (max 83.2) exceeds total decreed absolute 25.0 cfs across 30296 recorded day(s).
NORTH DELTA CANAL (FROM TONGUE CREEK) (4000730) DWR↗: Observed p99 daily rate 45.0 cfs (max 100.0) exceeds total decreed absolute 30.0 cfs across 18430 recorded day(s).
FIRE MT CANAL (4001810) DWR↗: Observed p99 daily rate 43.0 cfs (max 43.0) exceeds total decreed absolute 40.0 cfs across 248 recorded day(s).
NORTH FORK FARMERS D (4001185) DWR↗: Observed p99 daily rate 34.5 cfs (max 1560.0) exceeds total decreed absolute 32.1 cfs across 21606 recorded day(s).

Seniority (top structures by decreed rate)

Structure	Senior priority date	Rights	Decreed abs (cfs)	Decreed abs (AF)	Conditional?
FRUITLAND CANAL (4000549) DWR↗	1901-05-17	4	537.1	0	—
FIRE MOUNTAIN CANAL (4001133) DWR↗	1896-09-14	6	238.0	0	yes
COTTONWOOD CREEK ISF (4004193) DWR↗	2023-07-19	1	183.0	0	—
CRAWFORD CLIPPER DITCH (4000500) DWR↗	1885-10-19	15	164.3	0	—
ASPEN CANAL (4000509) DWR↗	1946-09-03	1	150.0	0	—
SMITH FORK FEEDER CANAL (4000605) DWR↗	1946-09-03	3	150.0	0	yes
OVERLAND DITCH (TERROR CREEK) (4001739) DWR↗	1893-08-01	2	150.0	0	—
SURFACE CREEK DITCH (WARD) (4000661) DWR↗	1886-07-26	6	117.3	0	—
LEROUX CREEK DITCH (4000926) DWR↗	1883-08-11	27	114.8	0	—
OVERLAND DITCH (LEROUX CREEK) (4000944) DWR↗	1883-08-11	30	107.7	0	—
GRANDVIEW CANAL (4000503) DWR↗	1895-03-28	3	90.5	0	—
ALFALFA DITCH (4000751) DWR↗	1881-12-17	5	87.2	3400	—
SADDLE MT HIGHLINE D (4000502) DWR↗	1897-05-01	7	83.7	0	—
STEWART DITCH (4001206) DWR↗	1882-06-01	6	82.0	0	—
OVERLAND DITCH (HUBBARD CREEK) (4001740) DWR↗	1893-08-01	1	75.0	0	—

No inventory or legal-document changes detected since the daily watch began.

Water-court filings this month (division-wide)

7 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 7 filings, with excerpts

Case	What it asks	County	Excerpt
`2026CW3030`	reasonable diligence, make absolute	DELTA	Case No. 2026CW3030 (Ref No. 19CW3044, 12CW89) DELTA COUNTY 1. Applicant: Daniel J. Thomas, 14976 Deer Run Rd. Delta, CO 81416-9171; (970) 209-1656 c/o Camp & Skarka, LLC, 415 Palmer St., Delta, CO 81416. APPLICATION TO MAKE ABSOLUTE IN PART, AND FOR FINDING O…
`25CW3085`	new storage right	DELTA	Case No. 25CW3085. DELTA COUNTY. GUNNISON RIVER OR ITS TRIBUTARIES. Columbine Family Ranch LLC, c/o Corona Water Law, 218 E. Valley Road #104 PMB 166, Carbondale, CO 91623, (970) 948 -6523, cc@craigcoronalaw.com. APPLICATION FOR WATER STORAGE RIGHTS. Reservoir…
`26CW18`	make absolute	—	Case No. 26CW18 (Ref No. 20CW2) Applicant Stewart Sto rms 708 Agape Circle Rockwall TX, 75087 Application to make Absolute. Storms Pump - Section15 T15S R84W Easting 346460 Northing 4290042. Source: Spring Creek . Date of Appropriation: December 1, 1953. Amoun…
`26CW3031`	plan for augmentation, new underground right	DELTA	Case No. 26CW3031, DELTA COUNTY, NORTH FORK OF THE GUNNISON AND GUNNISON RIVERS. Application for Conditional Underground Water Right, Approval of Plan for Augmentation and Conditional Exchange Project Right. Anastasia Suderman and Bryce Frazee, c/o Ryan Jarvis…
`26CW3033`	—	—	Case No. 26CW 3033 (Ref No. CA 2710; 20CW3017) Name, Address, and Telephone Number of Applicant. JBARM, Inc. (JBARM), c/o Andrew Bowles, 200 W. Nationwide Boulevard, Columbus, Ohio 43215; (614) 436 -2418. Please direct communications related to this applicatio…
`26CW3034`	—	DELTA	Case No. 26CW3034 (Ref 91CW0007) Delta County - Gunnison River; Town of Cedaredge; c/o John R. Pierce, DUFFORD WALDECK, 744 Horizon Court, Suite 300, Grand Junction, CO 81506, (970) 248-5865; APPLICATION FOR DETERMINATION OF WATER RIGHT (SURFACE); Name, addres…
`26CW3035` 2801276 2801277	reasonable diligence	GUNNISON	Case No. 26CW3035 (Ref No. 19CW3011) GUNNISON COUNTY. Fossil Creek Mines LLC, c/o Joseph Harrington, 8400 E. Prentice Avenue, Suite 1500, Greenwood Village, 80111. Please address all correspondence to: Peter D. Nichols, Esq., Katherine Carter, Esq., Berg Hill …

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
BSG WEST GRAVEL PIT	37-90-137(11) GRAVEL PIT PLAN	Approved	—	—	plan file
TRI-COUNTY GRAVEL PIT	37-90-137(11) GRAVEL PIT PLAN	Approved	—	—	plan file
SHADE LLC	37-92-308(4) PLAN PENDING COURT APPLICATION	Pending	—	—	plan file
HONEY ROCK UNDERDRAIN WELL (25CW3042)	37-92-308(4) PLAN PENDING COURT APPLICATION	Withdrawn	—	—	plan file

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.

North Fork/Tribs.

Schematic

Historical

Evolution of the network

Trends

This year, in context

Gage flow trend & changepoints

What drought has cost here

How the measurement network itself changed

Mass-balance (network closure) trend

Reach gain/loss shifts (1950–2026)

Cross-gage pattern fingerprint

Structures most implicated by reconciliation (as of 2026-07-06)

Data provenance & quality

Groundwater

Well map

3D aquifer x-ray

Water-table trends

Reservoirs

Reservoir map — how full is each vessel?

Basin storage, end of each water year

Largest reservoirs on record

Snow and runoff

Snow-water equivalent, WY2026

Two ways a snow year goes wrong (1979–2026)

Runoff outlook — Paonia Reservoir Inflow

Runoff outlook — NF Gunnison R nr Somerset

How good are these forecasts here? (1973–2025)

What April snow has meant for this river (1979–2025)

Runoff outlook — Surface Ck at Cedaredge

How good are these forecasts here? (1950–2025)

What April snow has meant for this river (1979–2025)

Legal

Is the river getting harder to divert from?

Why diversions stopped — call-based explanations

Right yield — how often could these rights actually divert?

Abandonment radar (25 screens)

Compliance screens (477 advisory flags)

Seniority (top structures by decreed rate)

Water-court filings this month (division-wide)

Active substitute water supply plans in this district

Call cascade

Pick a calling right