North Platte River Basin

Division 6 · Water District 47

Auto-mapped

North Platte River Basin on the ground — the ditches, wells, reservoirs and gages of Water District 47 · clicktap anything for its record

Snowpack — no snow on the ground at 4 SNOTEL sites — normal for the date; the snow year begins in October and typically peaks around April 5. Runoff outlook — North Platte R nr Northgate: even odds of at least 42 kAF over 06-01 to 09-30 — 29% 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
Columbine	9170	0.4	—	April 5 (24.6 in)
Never Summer	10300	0.0	—	May 11 (23.8 in)
Rawah	9100	0.0	—	April 7 (12.2 in)
Zirkel	9320	0.1	—	April 7 (28.5 in)

North Platte R nr Northgate — 06-01 to 09-30 volume, thousand acre-feet (chance the volume is AT LEAST this):

90%	70%	50%	30%	10%	Normal
12	26	42	50	63	143

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: 21 parent disagreements, 7 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 27 streams, 6 agree. Know this water? Tell us →

Stream	This site routes it to	DWR routes it to
Spring Creek	the mainstem	Yockum Creek
Pinkham Creek	the mainstem	North Platte River
Government Creek	the mainstem	Canadian River
Canadian River	the mainstem	North Platte River
Crystal Spring Creek	the mainstem	North Platte River
Spring Creek	the mainstem	Sunday Creek
Potter Creek	the mainstem	Illinois River
Antelope Creek	the mainstem	Potter Creek

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

Illinois River (71 mi) · Peterson Creek (10 mi) · Kimmons Creek (9 mi) · Meadow Creek (8 mi) · Sales Creek (5 mi) · Bridger Creek (4 mi) · Sage Hen 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 5 ranked gages are running at a median 30% of their own long-term norm for this window — 5 below a typical year, 0 at or above. Driest relative to its record: ILLINOIS RIVER NEAR RAND, ranking 1st lowest of 47 years.

How this comparison is made

Each gage's mean flow over the 3 days either side of 2026-07-06, compared with the same window in every year of its own record — so a gage is only ever measured against itself, and gages with no record in the window are counted out rather than guessed.

Gage flow trend & changepoints

What counts as a trend here

Computed 2026-08-30 21:05 from 33 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 33 gages with enough record, 3 are trending down and 0 up, and 2 carry a detected shift. The clearest is Illinois Creek at Walden, its annual mean flow changing -21.40 cfs per decade (-91.7% of its median annual flow) over 23 years (p=0.0043). The other 30 show no clear signal either way.

Gage	Trend	Change / decade cfs · % of median annual flow	Significance	Years	Changepoint
▸ Illinois Creek at Walden ILLWALCO	↓ decreasing	-21.40 cfs -91.7%	p=0.004	23	~1933
▸ Michigan River at Walden MICWLDCO	↓ decreasing	-15.82 cfs -34.5%	p=0.005	25	~1933
▸ Roaring Fork near Walden ROAWALCO	↓ decreasing	-15.36 cfs -25.0%	p=0.045	23	—

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

How the measurement network itself changed

This basin was not always measured the way it is today — the API-era record is dense and recent, the early record sparse. 5 gage(s) and 387 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)
1900s	7	0
1910s	1	0
1920s	6	0
1930s	10	0
1940s	10	0
1950s	4	32
1960s	2	0
1970s	4	344
1980s	4	412
1990s	4	436
2000s	5	482
2010s	6	428
2020s	5	291

Mass-balance (network closure) trend

Structure divrec-history backfill coverage as of the last check: 37% of 547 schematic-relevant structures. Kink count trend: no_trend (p=0.278), kink magnitude trend: no_trend (p=0.330) across 25 qualifying year(s).

Reach gain/loss shifts (1974–2026)

Mass-balance kinks computed for every summer month back to 1974 (244 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.

MICHIGAN RIVER AT WALDEN, CO.: reach shifted from +13 cfs to -47 cfs summer mean (more losing, p=0.012, 24 yr) [sedimentary uplands: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records] [2 alluvial wells within 2 mi of the gage; pooled water table -0.1 ft (1976–2024, no_trend)]

Groundwater now has its own tab: 52 monitored well(s), water-table trends, stream corridors, and the advisory depletion screen.

Reservoirs now has its own tab: 204 reservoir(s), end-of-year storage back to 1974, click-to-chart histories.

Cross-gage pattern fingerprint

Not enough gages with a long enough common-coverage window yet to fingerprint shared patterns.

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

Which structures' data absorbed the most correction when the current mass-balance snapshot was reconciled -- see the Historical tab for the full picture on any date.

MICHIGAN DITCH (diversion): +0.3 cfs (1% of that reach's correction)
CAMERON PASS DITCH (diversion): +0.3 cfs (1% of that reach's correction)
RANGER LAKES SUPPLY DITCH (diversion): +0.3 cfs (1% of that reach's correction)
UPPER RANGER LAKE (diversion): +0.3 cfs (1% of that reach's correction)
LOWER RANGER LAKE (diversion): +0.3 cfs (1% of that reach's correction)
GOULD DITCH (diversion): +0.3 cfs (1% of that reach's correction)
DRIFTER SPRING NO. 1 (return): +0.3 cfs (1% of that reach's correction)
DRIFTER POND (diversion): +0.3 cfs (1% of that reach's correction)
POVERTY FLAT D NO 1 (diversion): +0.3 cfs (1% of that reach's correction)
SHAFTO DITCH (diversion): +0.3 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 1555 day(s) old (DWR publishes ~1 year in arrears)
structure coverage	sparse	37% of schematic structures have data

Independent check: PASS — 100.0000% agreement across 100,670 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 — 99.98% day-level agreement with USGS's own published records for the same gages, across 28 co-listed station(s) and 164,636 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.

33 gage(s) / 190,601 daily values (1904-05-01–2026-07-06); 723 structure(s) with diversion records; 1262 with decreed rights. Methodology has not yet had independent expert review — treat every figure as an advisory screen, not an administrative or legal conclusion.

326 water-level measurements across 52 monitored well(s) — 17 alluvial, 12 bedrock — plus 4 administered well(s) reporting metered pumping.

What is being counted

Observation wells and pumping wells are different populations and are never conflated: water levels come from monitored observation wells, and metered pumping comes from administered wells reporting through diversion records. Click any well to chart its own record.

Well map

3D aquifer x-ray

Every aquifer unit as its own head surface, animated through time.

How the surfaces are built, and what they are not

Alluvial water table on top, Denver Basin members (Dawson, Denver, Arapahoe, Laramie–Fox Hills) stacked beneath where measured, interpolated from measured water levels. Units are never mixed; a surface exists only inside its own unit's well coverage, with no extrapolation; thin epochs are suppressed and say why. Vertical scale is exaggerated for readability and z is head elevation in feet. These are measured heads, not a calibrated groundwater model.

Water-table trends

Of 4 well(s) with enough record for a trend test: 1 declining, 1 rising.

Fastest-declining wells	Setting	ft / decade	Span	p
▸ NP-03	unknown	-10.65	33 yr	0.0131

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.

MICHIGAN RIVER AT WALDEN, CO.: 2 alluvial well(s) nearby; pooled water table -0.1 ft (1976–2024, no_trend, p=0.6922). Glover screen: 0.3 cfs of nearby metered alluvial pumping → est. lagged depletion 0.3–0.3 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.

204 reservoir(s) with 16,908 storage measurement(s), 1974–2026. Basin storage as of 2025-10-31 (the record's own end — reservoir records publish ~annually): 21,106 AF across 62 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)
▸ LAKE JOHN (4703750)	7,092	2025-10-31	—	—	dossier →
▸ MACFARLANE RES (4703614)	2,732	2025-10-31	—	—	dossier →
▸ LAUNE RESERVOIR (4703742)	2,602	2025-10-31	—	—	dossier →
▸ NORTH MICHIGAN CK RES (4703753)	1,090	2025-10-31	—	—	dossier →
▸ WALDEN RESERVOIR (4703627)	902	2025-10-31	—	—	dossier →
▸ MEADOW CREEK RES (4704335)	872	2025-10-31	—	—	dossier →
▸ BIG CREEK RESERVOIR (4703595)	730	2025-10-31	—	—	dossier →
▸ LAKE JOHN ANNEX (4703699)	692	2025-10-31	—	—	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)	% of median	Typical peak
Columbine	9170	0.4	—	April 5 (24.6 in)
Never Summer	10300	0.0	—	May 11 (23.8 in)
Rawah	9100	0.0	—	April 7 (12.2 in)
Zirkel	9320	0.1	—	April 7 (28.5 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 62% of median.

The snow never came: 1981, 1987, 1992, 2002, 2012, 2026.

Computed by this site from 4 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 — North Platte R nr Northgate

NRCS's final issue (2026-06-01) calls it even odds that at least 42 kAF arrives over 06-01 to 09-30 — 29% of a normal season; almost certainly at least 12, probably not more than 63. Our own record at this gage shows 21 kAF so far this period (partial record: 36 of 92 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	26	42	50	63	143	21*

How good are these forecasts here? (1959–2025)

Grading every April issue against what the river then delivered, measured at this gage’s own record — 66 seasons: the median miss of the 50% forecast is 20%, with a low bias of 0%, and the observed volume landed inside the stated 10–90% band 72% of the time (a calibrated forecast would say 80%).

Computed by this site: NRCS's archived April issues (their period as issued each year) against the observed volume in DWR’s published record; years with under 90% daily coverage are dropped, not summed. A grade of the forecast, never of the forecasters — these are hard rivers. How this point ranks among every graded Colorado forecast point →

What April snow has meant for this river (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 57% of a normal season (a snow-to-runoff elasticity of 1.7).

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 1880-05-15 to 2021-12-31. Of the 20 structures with a yield estimate, the median one’s senior right was in priority 8% of a median irrigation season and 0% in a dry one. 25 abandonment screens and 390 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: 1869 across 1262 structure(s); 195 structure(s) carry 0 court-case references. Advisory reading aids on public DWR data — not administrative or legal conclusions.

Is the river getting harder to divert from?

Over 2003–2025, administration on this district has been tightening: 1 of 3 measures (days under call, calls set, seniority of the controlling call) are moving toward more administration, none the other way.

The three measures, year by year

One row per whole calendar year inside the call record's coverage (23 years); partly-covered years are omitted rather than reported as quiet. Trend is Mann-Kendall with the same significance gate as every other trend on this site. Counted from DWR's published call record, which begins in the early 2000s: earlier years are absent, not quiet. A rise in the number of calls set can also reflect how finely an administrator records one episode, which is why days under call -- insensitive to that -- is the component to read first. Advisory summary of the public record, not an administrative finding.

Year	Days under call	Calls set	Controlling priority (median)
2014	204	38	1882-04-01
2015	215	27	1882-04-01
2016	198	56	1882-04-01
2017	185	73	1883-06-30
2018	197	95	1882-04-01
2019	177	30	1882-04-01
2020	204	109	1882-04-01
2021	250	158	1882-04-01
2022	249	87	1882-04-01
2023	365	50	1904-01-02
2024	306	75	1882-04-01
2025	186	97	1882-04-01

Why diversions stopped — call-based explanations

Sustained diversion stops matched to senior administrative calls.

CASTLE DITCH (4700549) DWR↗ stopped 2025-06-20 (27+ days) — call at WILLOW CK DITCH curtailing 100% of its decreed rate [heuristic-strong]
BONA FIDE DITCH (4700515) DWR↗ stopped 2025-06-18 (14+ days) — call at WILLOW CK DITCH curtailing 100% of its decreed rate [heuristic-strong]
BONA FIDE DITCH 2 (4700516) DWR↗ stopped 2025-06-17 (15+ days) — call at WILLOW CK DITCH curtailing 100% of its decreed rate [heuristic-strong]
BOSTWICK DITCH (4700521) DWR↗ stopped 2025-05-16 (6+ days) — call at METZ & REIGAN DITCH curtailing 100% of its decreed rate [heuristic-strong]
BONA FIDE DITCH (4700515) DWR↗ stopped 2024-09-11 (231+ days) — call at SIMON DITCH curtailing 60% of its decreed rate [heuristic-partial]
CARNEY DITCH (4700546) DWR↗ stopped 2024-07-31 (267+ days) — call at NICKELL DITCH curtailing 100% of its decreed rate [heuristic-strong]
BONA FIDE DITCH 2 (4700516) DWR↗ stopped 2024-07-25 (287+ days) — call at NICKELL DITCH curtailing 62% of its decreed rate [heuristic-partial]
BOCK DITCH (4700514) DWR↗ stopped 2024-07-19 (6+ days) — call at WISCONSIN DITCH curtailing 100% of its decreed rate [heuristic-strong]
BRIGGS BOHN DITCH (4700527) DWR↗ stopped 2024-07-17 (280+ days) — call at WISCONSIN DITCH curtailing 100% of its decreed rate [heuristic-strong]
CARDEN-DAGLE DITCH (4700544) DWR↗ stopped 2024-07-17 (440+ days) — call at WISCONSIN DITCH curtailing 100% of its decreed rate [heuristic-strong]
BOONE DITCH (4700519) DWR↗ stopped 2024-07-14 (359+ days) — call at WISCONSIN DITCH curtailing 100% of its decreed rate [heuristic-strong]
BOSTWICK DITCH (4700521) DWR↗ stopped 2024-07-14 (295+ days) — call at WISCONSIN DITCH curtailing 97% of its decreed rate [heuristic-partial]

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
MICHIGAN DITCH (4704603) DWR↗	1902-07-10	15.4% / 2.3%	7.5% / 0.0%
WOLFER DITCH (4700961) DWR↗	1888-05-08	17.6% / 5.6%	7.5% / 0.0%
BUDDY'S POND (4703546) DWR↗	1972-12-31	7.5% / 0.0%	7.5% / 0.0%
SOUTH HACKLEY POND (4703686) DWR↗	1986-12-31	7.5% / 0.0%	7.5% / 0.0%
RODRIQUEZ POND (4703687) DWR↗	1986-12-31	7.5% / 0.0%	7.5% / 0.0%
ROSS POND (4703582) DWR↗	1982-12-31	7.5% / 0.0%	7.5% / 0.0%
NORTH HACKLEY POND (4703685) DWR↗	1986-12-31	7.5% / 0.0%	7.5% / 0.0%
SCHROEDER POND (4703697) DWR↗	2002-12-31	7.5% / 0.0%	7.5% / 0.0%
MUTUAL DITCH (4700786) DWR↗	1888-08-29	17.6% / 4.7%	7.5% / 0.0%
HOWARD DITCH (4700672) DWR↗	1888-05-25	17.6% / 5.6%	7.5% / 0.0%
INDEPENDENT DITCH (4700684) DWR↗	1888-09-01	17.6% / 4.7%	13.6% / 0.0%
OVERLAND DITCH (4700819) DWR↗	1888-05-31	17.6% / 5.6%	7.5% / 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 ~1973 — idleness that begins before then may be unreported use, not nonuse (flagged † below).

SURPRISE DITCH (4700913) DWR↗ (1902-09-12, 10.0 cfs decreed): last active 1975 — 49 years idle
ANTELOPE NO 1 DITCH (4701012) DWR↗ (1908-05-01, 5.5 cfs decreed): last active 1976 — 48 years idle
HUGH GRIFFITH DITCH (4700677) DWR↗ (1888-05-01, 5.4 cfs decreed): last active 1998 — 26 years idle
SHEARER SPRING RES #2 (4703639) DWR↗ (1989-11-30, 0.0 cfs decreed): last active 2004 — 20 years idle
DWR SPG (4702001) DWR↗ (1935-05-10, 0.0 cfs decreed): last active 2005 — 19 years idle
SHEARER SPRINGS RES #1 (4703638) DWR↗ (1939-12-31, 0.0 cfs decreed): last active 2005 — 19 years idle
ROBBIES POND (4703670) DWR↗ (1967-07-15, 0.0 cfs decreed): last active 2005 — 19 years idle
SOUTH CASE CONTOUR (4703682) DWR↗ (1977-12-31, 2.0 cfs decreed): last active 2005 — 19 years idle
DEER CREEK SPRING (4701076) DWR↗ (1955-12-31, 0.0 cfs decreed): last active 2006 — 18 years idle
BLUEBILL POND (4703544) DWR↗ (1967-08-15, 2.0 cfs decreed): last active 2006 — 18 years idle

Compliance screens (390 advisory flags)

Screened 566 of 1262 structures with rights (648 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.

MUTUAL DITCH (4700786) DWR↗: Observed p99 daily rate 167.4 cfs (max 177.1) exceeds total decreed absolute 158.0 cfs across 9366 recorded day(s).
MIDLAND DITCH (4700774) DWR↗: Observed p99 daily rate 150.0 cfs (max 212.7) exceeds total decreed absolute 90.0 cfs across 20235 recorded day(s).
INDEPENDENT DITCH (4700684) DWR↗: Observed p99 daily rate 120.0 cfs (max 120.0) exceeds total decreed absolute 113.0 cfs across 9367 recorded day(s).
STAPLES DITCH 1 (4700895) DWR↗: Observed p99 daily rate 105.0 cfs (max 116.1) exceeds total decreed absolute 100.0 cfs across 7914 recorded day(s).
INDEPENDENCE DITCH (4700683) DWR↗: Observed p99 daily rate 95.0 cfs (max 95.0) exceeds total decreed absolute 52.0 cfs across 7431 recorded day(s).
SENECA DITCH (4700868) DWR↗: Observed p99 daily rate 91.4 cfs (max 93.0) exceeds total decreed absolute 73.0 cfs across 7206 recorded day(s).
LITTLE NELLIE DITCH (4700730) DWR↗: Observed p99 daily rate 91.0 cfs (max 101.4) exceeds total decreed absolute 89.2 cfs across 6409 recorded day(s).
MALLON DITCH NO 2 (4700748) DWR↗: Observed p99 daily rate 88.0 cfs (max 100.0) exceeds total decreed absolute 80.0 cfs across 7296 recorded day(s).
LEWIS DITCH (4700723) DWR↗: Observed p99 daily rate 80.0 cfs (max 80.0) exceeds total decreed absolute 40.0 cfs across 6628 recorded day(s).
BIG GRIZZLY DITCH (4700512) DWR↗: Observed p99 daily rate 78.0 cfs (max 96.7) exceeds total decreed absolute 66.7 cfs across 7574 recorded day(s).

Seniority (top structures by decreed rate)

Structure	Senior priority date	Rights	Decreed abs (cfs)	Decreed abs (AF)	Conditional?
MICHIGAN DITCH (4704603) DWR↗	1902-07-10	5	275.0	0	—
WOLFER DITCH (4700961) DWR↗	1888-05-08	5	218.5	0	—
BUDDY'S POND (4703546) DWR↗	1972-12-31	2	206.0	29	—
ROSS POND (4703582) DWR↗	1982-12-31	2	204.5	14	—
NORTH HACKLEY POND (4703685) DWR↗	1986-12-31	2	204.5	5	—
SOUTH HACKLEY POND (4703686) DWR↗	1986-12-31	2	204.5	4	—
RODRIQUEZ POND (4703687) DWR↗	1986-12-31	2	204.5	40	—
SCHROEDER POND (4703697) DWR↗	2002-12-31	2	185.0	3	—
MUTUAL DITCH (4700786) DWR↗	1888-08-29	4	158.0	0	—
HOWARD DITCH (4700672) DWR↗	1888-05-25	5	136.0	0	yes
INDEPENDENT DITCH (4700684) DWR↗	1888-09-01	3	113.0	0	—
OVERLAND DITCH (4700819) DWR↗	1888-05-31	9	108.3	0	—
SQUIBOB DITCH (4700893) DWR↗	1888-04-30	7	106.5	0	—
DARBY DITCH (4700584) DWR↗	1901-05-31	3	103.9	0	—
HUBBARD DITCH 2 (4700674) DWR↗	1889-04-02	7	103.0	0	—

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

Water-court filings this month (division-wide)

5 applications in the 2026-08 resume for this basin's division — new rights, changes, augmentation plans — from the water clerk's statutory monthly notice (C.R.S. 37-92-302), the earliest public signal of a new claim. Filings are division-wide, not district-filtered: check the county column. Full resume PDF at the Judicial Branch →

Anyone affected may file a statement of opposition until 2026-10-31 (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 5 filings, with excerpts

Case	What it asks	County	Excerpt
`2026CW10`	—	ROUTT	2026CW10 Routt County Application for Absolute Water Rights (Storage). Applicant: Wilton Earle 785 Valley View Drive Craig, CO 81625; 970-824-6258; rettae74@gmail.com.; Logan Earle 785 Valley View Drive Craig, CO 81625; 970-620-5288; earlelogan679@gmail.com St…
`2026CW11`	—	RIO BLANCO	2026CW11 Rio Blanco County Application for Simple Change in Surface Point of Diversion. Applicants: John and Diana Hartman, 2804 E Main Street, Rangely, CO 81648, 970-618-0088, dgrantelk@gmail.com Structure: Calvat Ditch. Original Decree: CA099. Case: 11/26/19…
`2026CW3009`	reasonable diligence	—	2026CW3009 ROUTT AND RIO BLANCO COUNTIES, Prima Ranches LLC, c/o David Harbaugh, 3575 E Cherry Creek North Drive, Denver, CO 80209, (303) 478-8997. Please address all correspondence to: Geoffrey M. Williamson, Katherine Carter, Berg Hill Greenleaf Ruscitti LLP…
`2026CW3010`	change of water right, plan for augmentation, new underground right	ROUTT	2026CW3010 ROUTT COUNTY Water Division: 6. DISTRICT COURT, WATER DIVISION SIX, STATE OF COLORADO, Routt County Combined Court, 1955 Shield Drive, Unit 200, Steamboat Springs, CO 80487. CONCERNING THE APPLICATION FOR WATER RIGHTS OF SIDNEY PEAK RANCH OWNERS’ AS…
`2026CW3011`	change of water right	RIO BLANCO	2026CW3011 RIO BLANCO COUNTY – WHITE RIVER. Mahogany Ranch, LLC, c/o Kevin L. Patrick, and John M. Sittler, Patrick, Miller & Noto, P.C., 229 Midland Ave., Basalt, CO 81621. (970) 920-1030. APPLICATION FOR CHANGE OF WATER RIGHT. Summary of Application: Applica…

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.