Roaring Fork River Basin

Division 5 · Water District 38

Auto-mapped

Roaring Fork River Basin on the ground — the ditches, wells, reservoirs and gages of Water District 38 · clicktap anything for its record

Snowpack — no snow on the ground at 8 SNOTEL sites — normal for the date; the snow year begins in October. Runoff outlook — Ruedi Reservoir Inflow : even odds of at least 15 kAF over 06-01 to 07-31 — 18% of a normal season, per NRCS, issued 2026-06-01 — the season’s final; new forecasts begin in January. Runoff outlook — Roaring Fk at Glenwood Springs: even odds of at least 88 kAF over 06-01 to 07-31 — 20% 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
Castle Peak	11510	0.0	—	—	—
Chapman Tunnel	10090	0.0	0.0	—	April 19 (15.4 in)
Independence Pass	10570	0.1	0.0	—	April 18 (17.4 in)
Ivanhoe	10540	0.1	0.0	—	April 26 (17.2 in)
Kiln	9610	0.0	0.0	—	April 7 (13.2 in)
Nast Lake	8710	0.0	0.0	—	March 28 (8.8 in)
North Lost Trail	9190	0.0	0.0	—	April 4 (17.4 in)
Schofield Pass	10640	0.2	0.0	—	April 19 (35.1 in)

Ruedi Reservoir Inflow — 06-01 to 07-31 volume, thousand acre-feet (chance the volume is AT LEAST this):

90%	70%	50%	30%	10%	Normal
8	12	15	21	29	83

Roaring Fk at Glenwood Springs — 06-01 to 07-31 volume, thousand acre-feet (chance the volume is AT LEAST this):

90%	70%	50%	30%	10%	Normal
40	63	88	120	150	445

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: 2 parent disagreements, 8 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 31 streams, 29 agree. Know this water? Tell us →

Stream	This site routes it to	DWR routes it to
Hunter Creek	the mainstem	Snowmass Creek
Dry Woody Creek	the mainstem	Red Canyon

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

Lincoln Creek (12 mi) · Red Canyon (9 mi) · Difficult Creek (9 mi) · Lost Man Creek (6 mi) · Red Canyon (6 mi) · Luchsinger Creek (6 mi) · McFarlane Creek (4 mi) · Crystal Spring Creek (4 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 19 ranked gages are running at a median 26% of their own long-term norm for this window — 18 below a typical year, 1 at or above. Driest relative to its record: HUNTER CREEK AT ASPEN, CO, ranking 1st lowest of 17 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 20:17 from 72 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 72 gages with enough record, 8 are trending down and 1 up, and 11 carry a detected shift. The clearest is North Fork Fryingpan River near Norrie, its annual mean flow changing -3.37 cfs per decade (-8.3% of its median annual flow) over 81 years (p<0.0001). The other 60 show no clear signal either way.

Gage	Trend	Change / decade cfs · % of median annual flow	Significance	Years	Changepoint
▸ North Fork Fryingpan River near Norrie FRYNFNCO	↓ decreasing	-3.37 cfs -8.3%	p<0.001	81	~1986
▸ Roaring Fork River at Glenwood Springs ROAGLECO	↓ decreasing	-47.43 cfs -3.9%	p<0.001	116	~1952
▸ ⚠️ Fryingpan River at Norrie FRYANOCO	↓ decreasing	-17.21 cfs -16.5%	p<0.001	41	~1971
▸ Hunter Creek near Aspen HUNTASCO	↓ decreasing	-3.90 cfs -8.6%	p=0.002	49	~1988
▸ Fryingpan River near Ruedi FRYRUDCO	↓ decreasing	-10.27 cfs -6.0%	p=0.005	61	~1999
▸ Rocky Fork Creek near Meredith RFCMERCO	↓ decreasing	-0.74 cfs -8.9%	p=0.006	57	~1998
▸ Chapman Gulch Feeder Canal near Norrie CHAGFOCO	↑ increasing	+6.80 cfs +57.5%	p=0.020	11	~1977
▸ Roaring Fork River Ab Difficult Creek near Aspen ROADIFCO	↓ decreasing extended 61 yr: no trend	-6.64 cfs -13.1%	p=0.022	46	~1999
▸ Fryingpan River at Meredith FRYMERCO	↓ decreasing	-7.79 cfs -4.9%	p=0.036	60	—
▸ Chapman Gulch near Nast CHAGULCO	no clear trend	+0.20 cfs +4.5%	p=0.234	50	~1980
▸ South Fork Fryingpan River at Upper Station near Norrie FRYSFUCO	no clear trend	+0.24 cfs +2.7%	p=0.353	59	~1971
▸ Fryingpan River near Ivanhoe Lake FRYIVLCO	no clear trend	-0.41 cfs -2.9%	p=0.470	57	~1971

⚠️ 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.

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

1 of those show a significant trend once extended backwards from a retired neighbour's record: Fryingpan River near Thomasville (83 yr, decreasing, suspect). 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. 22 gage(s) and 263 structure(s) report in 2026, but structure reporting only reached half its modern level around ~1975. 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)
1900s	1	0
1910s	8	0
1920s	1	0
1930s	2	0
1940s	4	0
1950s	9	42
1960s	22	68
1970s	26	230
1980s	20	326
1990s	19	307
2000s	21	204
2010s	23	254
2020s	22	262

Mass-balance (network closure) trend

Structure divrec-history backfill coverage as of the last check: 7% of 5751 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 (2628 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.

CRYSTAL RIVER AT PLACITA, CO.: reach shifted from +123 cfs to +180 cfs summer mean (more gaining, p=0.011, 12 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization]
ROARING FORK RIVER AT GLENWOOD SPRINGS, CO.: reach shifted from +2386 cfs to +1075 cfs summer mean (more losing, p=0.000, 77 yr) [alluvial valley: real alluvial aquifer -- a decades-long shift toward losing is the classic signature of alluvial pumping and urbanization]
CRYSTAL RIVER ABV AVALANCHE CRK, NEAR REDSTONE, CO: reach shifted from +295 cfs to -136 cfs summer mean (more losing, p=0.001, 63 yr) [sedimentary uplands: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records]
HUNTER CREEK AT ASPEN, CO: reach shifted from -54 cfs to -104 cfs summer mean (more losing, p=0.004, 17 yr) [sedimentary uplands: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records]
MAROON CREEK ABOVE ASPEN, CO.: reach shifted from +17 cfs to +59 cfs summer mean (more gaining, p=0.011, 26 yr) [sedimentary uplands: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records]
ROARING FORK RIVER ABV LOST MAN CR NEAR ASPEN, CO: reach shifted from +5 cfs to -25 cfs summer mean (more losing, p=0.004, 26 yr) [mountain crystalline canyon: minimal groundwater storage -- large or shifting unaccounted losses here are more consistent with data/measurement issues or unmodeled plumbing than with aquifer exchange]

Groundwater now has its own tab: 46 monitored well(s), water-table trends, stream corridors, and the advisory depletion screen.

Reservoirs now has its own tab: 165 reservoir(s), end-of-year storage back to 1953, click-to-chart histories.

Cross-gage pattern fingerprint

Over the 63-year window with full coverage (1964–2026), the dominant shared pattern across 3 gage(s) explains 65% of year-to-year variance (almost certainly a basin-wide climate/snowpack driver).

FRYSFUCO doesn't move with that shared pattern -- a real, localized signal (a new diversion, land-use change, or a gage-specific data problem) worth a closer look, not necessarily noise.

Structures most implicated by reconciliation (as of 2026-06-15)

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.

BOWLES PL & DITCH AP (diversion): +58.3 cfs (50% of that reach's correction)
BOWLES PL & DITCH (diversion): +58.3 cfs (50% of that reach's correction)
NAST SH GRPL SPRING (return): +12.6 cfs (50% of that reach's correction)
MT NAST ASSOC WTR CO SYS (return): +12.6 cfs (50% of that reach's correction)
IVANHOE RESERVOIR (diversion): -5.2 cfs (50% of that reach's correction)
IVANHOE RESERVOIR TUNNEL (diversion): -5.2 cfs (50% of that reach's correction)
BRANDYWINE SPRING (return): +5.0 cfs (1% of that reach's correction)
HOMESTEAD SPRING (return): +5.0 cfs (1% of that reach's correction)
PASTURES PIPELINE (diversion): +5.0 cfs (1% of that reach's correction)
PASTURES POND (diversion): +5.0 cfs (1% 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	7% of schematic structures have data

Independent check: PASS — 100.0000% agreement across 130,642 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 — 99.94% day-level agreement with USGS's own published records for the same gages, across 60 co-listed station(s) and 389,031 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.

72 gage(s) / 549,991 daily values (1906-04-01–2026-07-06); 899 structure(s) with diversion records; 4788 with decreed rights. Methodology has not yet had independent expert review — treat every figure as an advisory screen, not an administrative or legal conclusion.

149 water-level measurements across 46 monitored well(s) — 19 alluvial, 0 bedrock — plus 28 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.

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.

CRYSTAL RIVER AT PLACITA, CO.: 0 alluvial well(s) nearby

CRYSTAL RIVER ABV AVALANCHE CRK, NEAR REDSTONE, CO: 1 alluvial well(s) nearby. Glover screen: 0.1 cfs of nearby metered alluvial pumping → est. lagged depletion 0.0–0.1 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

HUNTER CREEK AT ASPEN, CO: 0 alluvial well(s) nearby. Glover screen: 0.0 cfs of nearby metered alluvial pumping → est. lagged depletion 0.0–0.0 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

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.

165 reservoir(s) with 7,787 storage measurement(s), 1953–2025. Basin storage as of 2024-10-31 (the record's own end — reservoir records publish ~annually): 79,357 AF across 3 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)
▸ RUEDI RESERVOIR (3803713)	78,521	2024-10-31	—	—	dossier →
▸ WILDCAT RESERVOIR (3803759)	1,140	2005-10-31	—	—	dossier →
▸ MESA RESERVOIR (3803738)	848	1985-10-31	—	—	dossier →
▸ IVANHOE RESERVOIR (3803732)	836	2024-10-31	—	—	dossier →
▸ ALICIA LAKE RESERVOIR (3803711)	673	2010-05-25	—	—	dossier →
▸ SPRING PARK RESERVOIR (3803744)	332	2022-08-14	—	—	dossier →
▸ WOODS LAKE RESERVOIR (3803760)	300	2005-10-31	—	—	dossier →
▸ JACOBSON LAKES & PONDS (3803832)	225	2002-10-31	—	—	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)	Median (in)	% of median	Typical peak
Castle Peak	11510	0.0	—	—	—
Chapman Tunnel	10090	0.0	0.0	—	April 19 (15.4 in)
Independence Pass	10570	0.1	0.0	—	April 18 (17.4 in)
Ivanhoe	10540	0.1	0.0	—	April 26 (17.2 in)
Kiln	9610	0.0	0.0	—	April 7 (13.2 in)
Nast Lake	8710	0.0	0.0	—	March 28 (8.8 in)
North Lost Trail	9190	0.0	0.0	—	April 4 (17.4 in)
Schofield Pass	10640	0.2	0.0	—	April 19 (35.1 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 (1981–2026)

A bad snow year here comes in two flavors (both called snow drought), and the river feels them differently. In 6 of the last 46 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: 1981, 1990, 2002, 2012, 2015, 2026.

Computed by this site from 8 SNOTEL sites’ full daily records (NRCS AWDB, back to 1981). 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 — Ruedi Reservoir Inflow

NRCS's final issue (2026-06-01) calls it even odds that at least 15 kAF arrives over 06-01 to 07-31 — 18% of a normal season; almost certainly at least 8, probably not more than 29. 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	12	15	21	29	83

Runoff outlook — Roaring Fk at Glenwood Springs

NRCS's final issue (2026-06-01) calls it even odds that at least 88 kAF arrives over 06-01 to 07-31 — 20% of a normal season; almost certainly at least 40, probably not more than 150. Our own record at this gage shows 76 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
40	63	88	120	150	445	76

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 24%, with a high bias of 21%, and the observed volume landed inside the stated 10–90% band 50% 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 (1981–2025)

Across 45 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 59% 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.

Decreed rights on this network run from 1870-12-31 to 2024-05-31. 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. 9 abandonment screens and 373 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: 6580 across 4788 structure(s); 1208 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 1988–2025, administration on this district has been tightening: 3 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 (38 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	365	184	1884-04-07
2015	365	256	1885-07-28
2016	366	237	1884-04-26
2017	365	330	1884-05-01
2018	365	290	1884-03-02
2019	365	165	1886-08-09
2020	366	221	1883-03-30
2021	365	218	1883-03-15
2022	365	201	1885-06-01
2023	365	120	1885-07-28
2024	366	164	1886-08-09
2025	365	232	1885-06-16

Why diversions stopped — call-based explanations

Sustained diversion stops matched to senior administrative calls.

ALVIN SLOSS DITCH (3800506) DWR↗ stopped 2024-09-29 (32+ days) — call at GRAND VALLEY CANAL curtailing 100% of its decreed rate [heuristic-strong]
BRIGHT DITCH (3800553) DWR↗ stopped 2024-09-22 (39+ days) — call at GRAND VALLEY CANAL curtailing 100% of its decreed rate [heuristic-strong]
ALVIN SLOSS DITCH (3800506) DWR↗ stopped 2024-09-08 (11+ days) — call at ATKINSON DITCH curtailing 100% of its decreed rate [heuristic-strong]
BIGLOW DITCH (3800539) DWR↗ stopped 2024-08-07 (85+ days) — call at CAMP BIRD DITCH curtailing 100% of its decreed rate [heuristic-strong]
ALVIN SLOSS DITCH (3800506) DWR↗ stopped 2024-06-03 (51+ days) — call at HALKOWEIZ DITCH curtailing 100% of its decreed rate [heuristic-strong]
ALVIN SLOSS DITCH (3800506) DWR↗ stopped 2023-10-31 (182+ days) — call at MOCKING BIRD DITCH curtailing 100% of its decreed rate [heuristic-strong]
DURANT MINE WTR BEGLEY D (3800533) DWR↗ stopped 2023-10-31 (27+ days) — call at MOCKING BIRD DITCH curtailing 100% of its decreed rate [heuristic-strong]
BOWLES AND HOLLAND DITCH (3800547) DWR↗ stopped 2023-10-31 (161+ days) — call at MOCKING BIRD DITCH curtailing 88% of its decreed rate [heuristic-partial]
ATKINSON DITCH (3800516) DWR↗ stopped 2023-10-30 (153+ days) — call at MOCKING BIRD DITCH curtailing 55% of its decreed rate [heuristic-partial]
BASIN DITCH (3800528) DWR↗ stopped 2023-10-30 (223+ days) — call at MOCKING BIRD DITCH curtailing 74% of its decreed rate [heuristic-partial]
BORAM AND WHITE DITCH (3800545) DWR↗ stopped 2023-10-30 (153+ days) — call at MOCKING BIRD DITCH curtailing 66% of its decreed rate [heuristic-partial]
BRIGHT DITCH (3800553) DWR↗ stopped 2023-10-30 (235+ days) — call at MOCKING BIRD 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
FRY ARK PR BOUSTEAD TUNNEL (3804625) DWR↗	1957-07-29	9.8% / 0.0%	9.8% / 0.0%
ASPEN WHITEWATER COURSE (3801418) DWR↗	1992-06-12	5.6% / 0.0%	5.6% / 0.0%
IND P TM DVR TUNNEL NO 1 (3804617) DWR↗	1930-08-23	33.2% / 0.0%	33.2% / 0.0%
IND P TM DVR TUNNEL NO 2 (3801763) DWR↗	1930-08-23	33.2% / 0.0%	5.6% / 0.0%
RUEDI RESERVOIR PWR PL (3801360) DWR↗	1975-10-22	9.8% / 0.0%	9.8% / 0.0%
MIN FLOW ROARING FORK 5 (3802112) DWR↗	1985-11-08	9.8% / 0.0%	9.8% / 0.0%
IND P TM DVR N YORK HGT3 (3801766) DWR↗	1930-08-23	33.2% / 0.0%	5.6% / 0.0%
MIN FLOW FRYINGPAN R MID (3802020) DWR↗	1973-07-12	9.8% / 0.0%	9.8% / 0.0%
MIDLAND FLUME DITCH (3800869) DWR↗	1885-11-16	100.0% / 0.0%	100.0% / 0.0%
MIN FLOW FRYINGPAN R LOW (3802077) DWR↗	1973-07-12	9.8% / 0.0%	9.8% / 0.0%
MIN FLOW CRYSTAL RIVER LOWER (3802114) DWR↗	1975-05-01	9.8% / 0.0%	9.8% / 0.0%
MIN FLOW ROARING FORK 4 (3802111) DWR↗	1985-11-08	9.8% / 0.0%	9.8% / 0.0%

Abandonment radar (9 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 ~1975 — idleness that begins before then may be unreported use, not nonuse (flagged † below).

CASTLE CREEK DITCH (3800576) DWR↗ (1884-08-15, 2.0 cfs decreed): last active 1956 — 29 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1975) -- early absence of record is weak evidence of nonuse
PRINCE DITCH (3800948) DWR↗ (1982-05-15, 13.4 cfs decreed): last active 1961 — 24 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1975) -- early absence of record is weak evidence of nonuse
FISHER AND HAFF DITCH (3800677) DWR↗ (1901-10-29, 2.0 cfs decreed): last active 1962 — 23 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1975) -- early absence of record is weak evidence of nonuse
RED MOUNTAIN DITCH (3800955) DWR↗ (1884-05-15, 0.1 cfs decreed): last active 1968 — 17 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1975) -- early absence of record is weak evidence of nonuse
EAGLE DITCH (3800647) DWR↗ (1888-03-17, 0.6 cfs decreed): last active 1969 — 16 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1975) -- early absence of record is weak evidence of nonuse
GLENWOOD DITCH CATTLE CR (3800711) DWR↗ (1900-11-18, 2.0 cfs decreed): last active 1969 — 16 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1975) -- early absence of record is weak evidence of nonuse
ROBERTS DITCH (3800965) DWR↗ (1888-09-04, 6.1 cfs decreed): last active 1975 — 10 years idle
RUEDI DITCH (3800977) DWR↗ (1887-05-15, 2.3 cfs decreed): last active 1975 — 10 years idle
EARL V NELSON MTN CR RCH SPRING (3801089) DWR↗ (1953-06-30, 0.1 cfs decreed): last active 1975 — 10 years idle

Compliance screens (373 advisory flags)

Screened 696 of 4788 structures with rights (784 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.

RUEDI RESERVOIR PWR PL (3801360) DWR↗: Observed p99 daily rate 320.9 cfs (max 507.0) exceeds total decreed absolute 300.0 cfs across 47812 recorded day(s).
IND P TM DVR LOST MAN (3801767) DWR↗: Observed p99 daily rate 192.6 cfs (max 242.8) exceeds total decreed absolute 21.3 cfs across 8895 recorded day(s).
PATERSON D JACOB EXT (3800930) DWR↗: Observed p99 daily rate 118.9 cfs (max 218.1) exceeds total decreed absolute 63.0 cfs across 28936 recorded day(s).
MOUNTAIN MEADOWS DITCH (3800881) DWR↗: Observed p99 daily rate 100.0 cfs (max 146.9) exceeds total decreed absolute 53.0 cfs across 23772 recorded day(s).
SALVATION DITCH (3800981) DWR↗: Observed p99 daily rate 96.0 cfs (max 110.0) exceeds total decreed absolute 59.0 cfs across 24051 recorded day(s).
HOME SUPPLY DITCH (3800757) DWR↗: Observed p99 daily rate 90.6 cfs (max 94.8) exceeds total decreed absolute 59.0 cfs across 19551 recorded day(s).
IVANHOE RESERVOIR TUNNEL (3804613) DWR↗: Observed p99 daily rate 69.0 cfs (max 132.0) exceeds total decreed absolute 35.0 cfs across 48796 recorded day(s).
GLENWOOD DITCH (3800712) DWR↗: Observed p99 daily rate 60.0 cfs (max 62.4) exceeds total decreed absolute 45.9 cfs across 23043 recorded day(s).
ROBINSON DITCH (3800968) DWR↗: Observed p99 daily rate 55.0 cfs (max 64.6) exceeds total decreed absolute 49.3 cfs across 25208 recorded day(s).
LOWLINE DITCH (3800840) DWR↗: Observed p99 daily rate 54.4 cfs (max 61.3) exceeds total decreed absolute 40.5 cfs across 23523 recorded day(s).

Seniority (top structures by decreed rate)

Structure	Senior priority date	Rights	Decreed abs (cfs)	Conditional?
FRY ARK PR BOUSTEAD TUNNEL (3804625) DWR↗	1957-07-29	2	1000.0	—
ASPEN WHITEWATER COURSE (3801418) DWR↗	1992-06-12	1	653.0	—
IND P TM DVR TUNNEL NO 1 (3804617) DWR↗	1930-08-23	1	625.0	—
IND P TM DVR TUNNEL NO 2 (3801763) DWR↗	1930-08-23	2	486.2	yes
RUEDI RESERVOIR PWR PL (3801360) DWR↗	1975-10-22	1	300.0	—
MIN FLOW ROARING FORK 5 (3802112) DWR↗	1985-11-08	1	220.0	—
IND P TM DVR N YORK HGT3 (3801766) DWR↗	1930-08-23	3	210.0	yes
MIN FLOW FRYINGPAN R MID (3802020) DWR↗	1973-07-12	1	200.0	—
MIDLAND FLUME DITCH (3800869) DWR↗	1885-11-16	2	160.0	—
MIN FLOW FRYINGPAN R LOW (3802077) DWR↗	1973-07-12	1	110.0	—
MIN FLOW CRYSTAL RIVER LOWER (3802114) DWR↗	1975-05-01	1	100.0	—
MIN FLOW ROARING FORK 4 (3802111) DWR↗	1985-11-08	1	85.0	—
MIN FLOW CRYSTAL R L MID (3802115) DWR↗	1975-05-01	1	80.0	—
IND P TM DVR N YORK HGT1 (3801764) DWR↗	1930-08-23	3	76.6	—
SWEET JESSUP CANAL (3801038) DWR↗	1902-01-14	4	75.0	yes

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

Water-court filings this month (division-wide)

1 application 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 (61 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 1 filings, with excerpts

Case	What it asks	County	Excerpt
`26CW3012`	change of water right	RIO BLANCO	26CW3012 Rio Blanco County. Application For Change of Water Right and Approval of Augmentation Plan. Applicant: Three Crown Ranch, LLC, Balcomb & Green, P.C., P.O. Drawer 790, Glenwood Springs, CO 81602, (970) 945-6546; balcombgreen.com. First Claim for Change…

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
SIEVERS PIT (M-77-098)	37-90-137(11) GRAVEL PIT PLAN	Approved	—	—	plan file
CARBONDALE, TOWN OF - EMERGENCY	37-92-308(7) PLAN EMERGENCY	Division Review	—	—	plan file
WEST DIVIDE WATER CONSERVANCY DISTRICT - 25CW3194 CRYSTAL RIVER	37-92-308(4) PLAN PENDING COURT APPLICATION	Division Review	—	—	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.