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Clear Creek

Division 1 · Water District 7 · As of 2026-08-28 00:50 MDT

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Reconstruct conditions as of

Evolution of the network

This year, in context

In the weeks around 2026-08-09 (the newest reading on file), flows at the 86 ranked gages are running at a median 55% of their own long-term norm for this window — 65 below a typical year, 21 at or above. Driest relative to its record: CHURCH DITCH TO CLEAR CREEK (BLACK HAWK AUG RETURN), ranking 1st lowest of 11 years.

How this comparison is made

Each gage's mean flow over the 3 days either side of 2026-08-09, 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 2026-08-28 01:02 from 120 gage(s) with cached period-of-record data. Mann-Kendall (trend) 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.”

Of the 120 gages with enough record, 10 are trending down and 3 up, and 9 carry a detected shift. The clearest is STRAIGHT CR. TUNNEL AT EAST PORTAL OF EISENHOWER, -31.0 points of its long-term median per decade over 32 years (p<0.0001). The other 106 show no clear signal either way.

Gage	Trend	Change / decade points of median	Significance	Years	Changepoint
▸ COORS HOT WELL #1 COOLING WATER RETURN CRSHW1CO	↓ decreasing	-243.7	p=0.013	11	—
▸ COORS HOT WELL #2 COOLING WATER RETURN CRSHW2CO	↓ decreasing	-135.2	p=0.043	11	—
▸ ⚠️ GUANELLA RESERVOIR INFLOW GUAINFCO	↑ increasing	+101.9	p=0.000	21	~2014
▸ ⚠️ GUANELLA RESERVOIR (OUTFLOW) GUAOUTCO	↑ increasing	+71.5	p=0.000	22	~2015
▸ COORS TREATMENT BACKWASH RETURN TO CLEAR CREEK COOTRECO	↑ increasing	+69.3	p=0.003	11	—
▸ COORS IND DITCH CRSINDCO	↓ decreasing	-39.4	p=0.008	11	—
▸ STRAIGHT CR. TUNNEL AT EAST PORTAL OF EISENHOWER STCTUNCO	↓ decreasing	-31.0	p=0.000	32	~2006
▸ NORTH CLEAR CREEK ABOVE MOUTH NR BLACK HAWK, CO NCCBLACO	↓ decreasing	-25.7	p=0.000	32	~2015
▸ WEST FORK CLEAR CREEK ABV MOUTH NR EMPIRE, CO WFCEMPCO	↓ decreasing	-20.4	p=0.000	32	~2015
▸ AUGUST P. GUMLICK TUNNEL NEAR JONES PASS APGTUNCO	no clear trend	-18.4	p=0.357	41	~1990
▸ CHICAGO CREEK BLW DEVILS CANYON NR IDAHO SPRGS C CHIDEVCO	↓ decreasing	-16.9	p=0.025	20	—
▸ CLEAR CREEK ABV WEST FORK CLEAR CREEK NR EMPIRE CO CLEWFOCO	↓ decreasing	-16.6	p=0.000	32	~2017
▸ LEAVENWORTH CREEK AT MOUTH NEAR GEORGETOWN, CO LVNGEOCO	↓ decreasing	-14.4	p=0.003	30	~2015
▸ CLEAR CREEK NEAR GOLDEN, CO. CLENEGCO	↓ decreasing	-4.9	p=0.000	70	~1930

⚠️ 2 gages flagged: their records may have quietly shifted against their neighbours, so treat their trends with caution.

How drift is detected

Every gage's annual flows are compared against each neighbour's as a double-mass curve (Searcy & Hardison, USGS WSP 1541-B); a Pettitt step test looks for a break in the ratio. A gage is flagged only when the breaks AGREE across its references, and a break against an already-suspect gage is never counted against a healthy one. A double-mass break means the ratio between two gages changed, not that either gage is faulty: a new diversion, a reservoir, or an import changes that ratio exactly as a rating shift does. Screening aid for expert review, never a measurement verdict.

106 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. 102 gage(s) and 139 structure(s) report in 2026, but structure reporting only reached half its modern level around ~1981. Every historical claim below is checked against this: long-term shifts that co-move with the growth of the network carry an explicit measurement-evolution caution, and abandonment screens whose idleness begins before the modern reporting era are flagged †.

Decade	Gages with data (median yr)	Structures reporting (median yr)
1890s	1	0
1900s	1	0
1910s	1	0
1920s	1	0
1930s	4	0
1940s	5	0
1950s	6	20
1960s	5	19
1970s	7	30
1980s	6	72
1990s	12	62
2000s	14	62
2010s	36	86
2020s	98	137

Mass-balance (network closure) trend

Structure divrec-history backfill coverage as of the last check: 45% of 226 schematic-relevant structures. 10 year(s) clear the 30% coverage gate so far (2016–2025) -- 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 (1011 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.

CLEAR CREEK NEAR GOLDEN, CO.: reach shifted from +78 cfs to +157 cfs summer mean (more gaining, p=0.030, 30 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]
CLEAR CREEK AT GOLDEN, CO: reach shifted from +92 cfs to +32 cfs summer mean (more losing, p=0.009, 52 yr) [sedimentary plains/foothills: moderate groundwater connectivity -- gain/loss shifts can be real aquifer response; corroborate with nearby well records]

Groundwater now has its own tab: 510 monitored well(s), water-table trends, stream corridors, and the advisory depletion screen.

Reservoirs now has its own tab: 151 reservoir(s), end-of-year storage back to 1920, click-to-chart histories.

Cross-gage pattern fingerprint

Over the 52-year window with full coverage (1975–2026), 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 2026-08-09)

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.

CLEAR LAKE RES (diversion): +12.0 cfs (100% of that reach's correction)
SEA OF TRANQUILLITY RES (diversion): -10.0 cfs (50% of that reach's correction)
DORY LAKE INLET DITCH (diversion): -10.0 cfs (50% of that reach's correction)
GOLDEN CITY WATER WORKS RESERVOIR (diversion): -0.9 cfs (4% of that reach's correction)
AGRICULTURAL DITCH (diversion): -0.9 cfs (4% of that reach's correction)
COORS INDUSTRIAL DITCH (diversion): -0.9 cfs (4% of that reach's correction)
COORS COOLING WATER RT BELOW INLET (return): -0.9 cfs (4% of that reach's correction)
FARMERS HIGHLINE CANAL (diversion): -0.9 cfs (4% of that reach's correction)
FARMERS HIGHLINE RT TO CLEAR CR (return): -0.9 cfs (4% of that reach's correction)
COORS HOT W 2 COOLING WTR RT (diversion): -0.9 cfs (4% of that reach's correction)

Data provenance & quality

Where these numbers come from and how far they can be trusted. Grade B (4/6 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 19 day(s) old (target 7)
diversion record	expected-lag	newest diversion record is 301 day(s) old (DWR publishes ~1 year in arrears)
structure coverage	partial	45% of schematic structures have data

Independent check: PASS — 100.0000% agreement across 580,149 stored values re-checked against DWR's authoritative record (HydroBase_CO_20260707), over 25 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: WARN — 93.27% day-level agreement with USGS's own published records for the same gages, across 20 co-listed station(s) and 155,784 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.

120 gage(s) / 546,515 daily values (1899-04-01–2026-08-09); 266 structure(s) with diversion records; 1815 with decreed rights. Methodology has not yet had independent expert review — treat every figure as an advisory screen, not an administrative or legal conclusion.

4,042 water-level measurements across 510 monitored well(s) — 276 alluvial, 96 bedrock — plus 6 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 6 well(s) with enough record for a trend test: 1 declining, 3 rising.

Fastest-declining wells	Setting	ft / decade	Span	p
▸ DB-200 PV-KLF	bedrock	-7.48	45 yr	0.0

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.

CLEAR CREEK NEAR GOLDEN, CO.: 4 alluvial well(s) nearby. Glover screen: 3.1 cfs of nearby metered alluvial pumping → est. lagged depletion 1.9–2.9 cfs (uncalibrated T/S ranges; flagged for SPDSS calibration, AWAS cross-check, and expert review — DWR's AWAS is the authority).

CLEAR CREEK AT GOLDEN, CO: 4 alluvial well(s) nearby. Glover screen: 3.1 cfs of nearby metered alluvial pumping → est. lagged depletion 2.5–3.0 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.

151 reservoir(s) with 33,869 storage measurement(s), 1920–2025. Basin storage as of 2024-10-31 (the record's own end — reservoir records publish ~annually): 30,687 AF across 39 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.

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 reservoir to chart its full storage history.

Reservoir	Last recorded storage (AF)	As of
▸ 0703903	35,554	1993-10-01
▸ RALSTON RES (0703324)	9,126	2024-10-31
▸ 0703018	6,512	2012-10-31
▸ BLUNN RES (0703308)	4,752	2024-10-31
▸ COORS B4 (0703407)	4,000	2024-10-31
▸ 0704357	3,000	1965-11-01
▸ 0704403	3,000	1963-11-01
▸ COORS B3(THUET MAUZ RES) (0703406)	2,764	2024-10-31

Decreed rights on this network run from 1859-12-31 to 2023-07-05. Of the 20 structures with a yield estimate, the median one’s senior right was in priority 100% of a median irrigation season and 87% in a dry one. 23 abandonment screens and 30 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: 3627 across 1815 structure(s); 153 structure(s) carry 955 court-case references. Advisory reading aids on public DWR data — not administrative or legal conclusions.

Is the river getting harder to divert from?

Over 1951–2025, 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 (75 years); partly-covered years are omitted rather than reported as quiet. Trend is Mann-Kendall with the same significance gate as every other trend on this site. Counted from DWR's published call record, which begins in the early 2000s: earlier years are absent, not quiet. A rise in the number of calls set can also reflect how finely an administrator records one episode, which is why days under call -- insensitive to that -- is the component to read first. Advisory summary of the public record, not an administrative finding.

Year	Days under call	Calls set	Controlling priority (median)
2014	309	220	1873-06-30
2015	329	162	1870-06-01
2016	366	242	1869-06-01
2017	355	317	1869-06-01
2018	365	363	1869-06-01
2019	365	347	1869-06-01
2020	366	278	1867-04-15
2021	365	252	1862-11-01
2022	365	297	1862-06-06
2023	365	308	1869-06-01
2024	366	269	1869-06-01
2025	365	431	1865-01-01

What the water is for — decade by decade

Of the water this district's structures diverted, the share whose decree includes municipal supply moved from 74% in the 1980s to 89% in the 2020s.

The decades, and how the attribution works

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

Decade	Recorded AF	Structures	Includes municipal	Unattributed
1950s †	1,280,375	29	45%	7%
1960s †	1,266,620	23	47%	11%
1970s †	1,605,009	66	44%	14%
1980s	2,001,871	84	74%	14%
1990s	2,020,227	58	85%	14%
2000s	1,694,114	64	87%	9%
2010s	2,374,510	153	85%	34%
2020s	1,728,255	141	89%	27%

Why diversions stopped — call-based explanations

Sustained diversion stops matched to senior administrative calls. Self-check: 84% of the 19 explanations coverable by DWR's own out-of-priority analysis agree with it (6 outside its scope).

COLO AGRICULTURAL D (0700549) DWR↗ stopped 2025-10-04 (27+ days) — call at CLEAR CR PLATTE RIVER D curtailing 100% of its decreed rate [heuristic-partial, district-confirmed]
CROKE CANAL (0700553) DWR↗ stopped 2025-08-07 (11+ days) — call at CLEAR CR PLATTE RIVER D curtailing 100% of its decreed rate [heuristic-partial, district-confirmed]
CHURCH DITCH (0700540) DWR↗ stopped 2025-08-06 (86+ days) — call at CLEAR CR PLATTE RIVER D curtailing 100% of its decreed rate [heuristic-partial, district-confirmed]
GREEN LAKE DITCH (0700582) DWR↗ stopped 2025-08-03 (89+ days) — call at CLEAR CR PLATTE RIVER D curtailing 100% of its decreed rate [heuristic-strong, district-confirmed]
MANHART DITCH (0700614) DWR↗ stopped 2025-06-23 (8+ days) — call at BLUNN RES curtailing 93% of its decreed rate [heuristic-partial, district-confirmed]
CROKE CANAL (0700553) DWR↗ stopped 2025-06-14 (10+ days) — call at BLUNN RES curtailing 100% of its decreed rate [heuristic-partial, district-confirmed]
CROKE CANAL (0700553) DWR↗ stopped 2025-04-07 (29+ days) — call at WANNAMAKER DITCH curtailing 100% of its decreed rate [heuristic-partial, district-confirmed]
AGRICULTURAL DITCH (0700502) DWR↗ stopped 2024-11-01 (155+ days) — call at TUCKER RES curtailing 98% of its decreed rate [heuristic-partial, district-confirmed]
FARMERS HIGHLINE CANAL (0700569) DWR↗ stopped 2024-11-01 (150+ days) — call at TUCKER RES curtailing 99% of its decreed rate [heuristic-partial, district-confirmed]
FISHER DITCH (0700570) DWR↗ stopped 2024-11-01 (171+ days) — call at TUCKER RES curtailing 60% of its decreed rate [heuristic-partial, district-confirmed]
CLEAR CR PLATTE RIVER D (0700547) DWR↗ stopped 2024-10-31 (151+ days) — call at TUCKER RES curtailing 63% of its decreed rate [heuristic-partial, district-confirmed]
CHURCH DITCH (0700540) DWR↗ stopped 2024-10-04 (220+ days) — call at B H EATON DITCH curtailing 100% of its decreed rate [heuristic-partial]

DWR out-of-priority analysis (scoped structures)

Structure	Right (admin no)	Mean % out of priority	Days curtailed	Span
HAINES PIQUETTE DITCH (0700586) DWR↗	52466.00000	88.6%	89.1%	2021-01-01 – 2025-12-31
LONG LAKE DITCH (0700711) DWR↗	21706.00000	82.2%	82.6%	2021-01-01 – 2025-12-31
AGRICULTURAL DITCH (0700502) DWR↗	60996.38628	79.2%	79.4%	2021-01-01 – 2025-12-31
LINDSTROM NO 2 DITCH (0700606) DWR↗	57023.00000	79.2%	79.4%	2021-01-01 – 2025-12-31
FARMERS HIGHLINE CANAL (0700569) DWR↗	60996.00000	78.9%	79.0%	2021-01-01 – 2025-12-31
CHURCH DITCH (0700540) DWR↗	55149.00000	78.8%	79.1%	2021-01-01 – 2025-12-31
LONG LAKE DITCH (0700711) DWR↗	8550.00000	78.8%	79.2%	2021-01-01 – 2025-12-31
COORS INDUSTRIAL DITCH (0700725) DWR↗	54421.51395	78.8%	79.1%	2021-01-01 – 2025-12-31
GOLDEN CITY WATER WORKS PIPELINE (0700575) DWR↗	53325.50130	78.7%	79.0%	2021-01-01 – 2025-12-31
WELCH DITCH (0700699) DWR↗	51696.00000	78.6%	78.9%	2021-01-01 – 2025-12-31
LOWER LOVELAND SNOWMAKING & DOMESTIC DIVERSION (0700874) DWR↗	50768.00000	78.6%	78.9%	2021-01-01 – 2025-12-31
LEE STEWART ESKINS DITCH (0700601) DWR↗	58286.00000	78.5%	79.0%	2021-01-01 – 2025-12-31
BLUNN RES (0703308) DWR↗	61358.00000	78.4%	78.6%	2021-01-01 – 2025-12-31
WANNAMAKER DITCH (0700698) DWR↗	53325.50130	78.0%	78.4%	2021-01-01 – 2025-12-31
ROCKY MOUNTAIN DITCH (0700652) DWR↗	61322.00000	76.9%	77.2%	2021-01-01 – 2025-12-31

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
FARMERS HIGHLINE CANAL (0700569) DWR↗	1860-02-25	100.0% / 100.0%	4.9% / 0.0%
CHURCH DITCH (0700540) DWR↗	1860-02-25	100.0% / 100.0%	4.9% / 0.0%
CROKE CANAL (0700553) DWR↗	1860-02-25	100.0% / 100.0%	4.9% / 0.0%
0701000 DWR↗	1998-12-30	4.9% / 0.0%	4.9% / 0.0%
ROCKY MOUNTAIN DITCH (0700652) DWR↗	1860-02-25	100.0% / 100.0%	4.9% / 0.0%
AGRICULTURAL DITCH (0700502) DWR↗	1860-02-25	100.0% / 100.0%	4.9% / 0.0%
0700873 DWR↗	1860-05-16	100.0% / 86.9%	12.8% / 0.0%
CHURCH DITCH RALSTON CREEK DIVERSION (0700942) DWR↗	1860-08-31	100.0% / 79.9%	4.9% / 0.0%
FARMERS HIGHLINE RALSTON CREEK (0700872) DWR↗	1860-08-31	100.0% / 79.9%	4.9% / 0.0%
0700871 DWR↗	1860-05-16	100.0% / 86.9%	12.8% / 0.0%
0700648 DWR↗	1906-10-17	12.8% / 0.0%	12.8% / 0.0%
0700877 DWR↗	1930-01-01	5.6% / 0.0%	5.6% / 0.0%

Abandonment radar (23 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 ~1981 — idleness that begins before then may be unreported use, not nonuse (flagged † below).

GOLDEN CITY WATER WORKS PIPELINE (0700575) DWR↗ (1860-02-25, 21.2 cfs decreed): last active 1952 — 73 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1981) -- early absence of record is weak evidence of nonuse
0700666 DWR↗ (1893-08-23, 5.0 cfs decreed): last active 1974 — 51 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1981) -- early absence of record is weak evidence of nonuse
0700581 DWR↗ (1863-05-21, 0.1 cfs decreed): last active 1980 — 45 years idle † predates modern reporting era — last recorded activity predates this basin's modern reporting era (~1981) -- early absence of record is weak evidence of nonuse
0703398 DWR↗ (1974-04-01, 0.0 cfs decreed): last active 1981 — 44 years idle
0704396 DWR↗ (1871-12-31, 0.0 cfs decreed): last active 1987 — 38 years idle
SMALL STORAGE TANKS (0704079) DWR↗ (1988-07-01, 0.0 cfs decreed): last active 1991 — 34 years idle
RHODES SOUTH DITCH (0700650) DWR↗ (1865-07-05, 2.8 cfs decreed): last active 1992 — 33 years idle
LOWER LOVELAND SNOWMAKING & DOMESTIC DIVERSION (0700874) DWR↗ (1988-12-30, 11.0 cfs decreed): last active 1992 — 33 years idle
LOVELAND BASIN RES (0703391) DWR↗ (1984-08-21, 0.0 cfs decreed): last active 1992 — 33 years idle
LOVELAND VALLEY RES (0703392) DWR↗ (1984-08-21, 0.0 cfs decreed): last active 1992 — 33 years idle

Compliance screens (30 advisory flags)

Screened 83 of 1815 structures with rights (134 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.

GOLDEN CITY WATER WORKS PIPELINE (0700575) DWR↗: Observed p99 daily rate 110.0 cfs (max 110.0) exceeds total decreed absolute 21.2 cfs across 1029 recorded day(s).
0700666 DWR↗: Observed p99 daily rate 49.0 cfs (max 68.0) exceeds total decreed absolute 5.0 cfs across 2950 recorded day(s).
BLUNN RES (0703308) DWR↗: Observed p99 daily rate 32.1 cfs (max 416.6) exceeds total decreed absolute 15.1 cfs across 51491 recorded day(s).
CROKE CANAL RALSTON CREEK DIVERSION (0700728) DWR↗: Observed p99 daily rate 19.0 cfs (max 19.1) exceeds total decreed absolute 0.1 cfs across 192 recorded day(s).
KERSHAW DITCH (0700597) DWR↗: Observed p99 daily rate 13.0 cfs (max 16.0) exceeds total decreed absolute 11.4 cfs across 34138 recorded day(s).
GOLDEN CITY DITCH (0700542) DWR↗: Observed p99 daily rate 11.2 cfs (max 49.6) exceeds total decreed absolute 11.1 cfs across 63001 recorded day(s).
MANHART DITCH (0700614) DWR↗: Observed p99 daily rate 11.0 cfs (max 17.2) exceeds total decreed absolute 9.8 cfs across 32584 recorded day(s).
CORT GRAVES HUGHES DITCH (0700551) DWR↗: Observed p99 daily rate 7.0 cfs (max 7.0) exceeds total decreed absolute 0.6 cfs across 18023 recorded day(s).
APEX GULCH FEEDER D (0700717) DWR↗: Observed p99 daily rate 6.1 cfs (max 6.8) exceeds total decreed absolute 2.0 cfs across 6113 recorded day(s).
OUELETTE DITCH (0700632) DWR↗: Observed p99 daily rate 6.0 cfs (max 11.0) exceeds total decreed absolute 1.1 cfs across 18892 recorded day(s).

Seniority (top structures by decreed rate)

Structure	Senior priority date	Rights	Decreed abs (cfs)	Decreed abs (AF)	Conditional?
FARMERS HIGHLINE CANAL (0700569) DWR↗	1860-02-25	121	5760.2	0	yes
CHURCH DITCH (0700540) DWR↗	1860-02-25	66	1298.3	0	yes
CROKE CANAL (0700553) DWR↗	1860-02-25	82	1132.7	0	yes
0701000 DWR↗	1998-12-30	1	1000.0	0	—
ROCKY MOUNTAIN DITCH (0700652) DWR↗	1860-02-25	51	598.6	0	—
AGRICULTURAL DITCH (0700502) DWR↗	1860-02-25	59	539.6	910	yes
0700873 DWR↗	1860-05-16	39	519.3	0	—
CHURCH DITCH RALSTON CREEK DIVERSION (0700942) DWR↗	1860-08-31	8	480.2	0	—
FARMERS HIGHLINE RALSTON CREEK (0700872) DWR↗	1860-08-31	24	478.5	0	—
0700871 DWR↗	1860-05-16	40	469.6	0	—
0700648 DWR↗	1906-10-17	1	318.0	0	—
0700877 DWR↗	1930-01-01	1	212.0	0	yes
COORS INDUSTRIAL DITCH (0700725) DWR↗	1860-02-25	25	190.3	0	—
CLEAR CR PLATTE RIVER D (0700547) DWR↗	1860-02-25	60	133.2	4368	yes
COLO AGRICULTURAL D (0700549) DWR↗	1861-11-01	7	112.6	0	—

Recent inventory & legal-document changes

2026-08-26 — call set: LOWER PLATTE BEAVER D (39357)
2026-08-26 — call set: OGILVY DITCH (39359)
2026-08-26 — call released: 39331
2026-08-26 — call released: 39335
2026-08-26 — call released: 39333
2026-08-26 — call set: SOUTH FLAT DITCH (39348)
2026-08-26 — call set: HARRIMAN DITCH (39347)
2026-08-26 — call released: 39287

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.

Stream	Gage	R-mile	Predicted (cfs)	Observed (cfs)	Δ (cfs)	Reach (mi)	Hypothesis
MAINSTEM	CLEAR CREEK NEAR LAWSON, CO (CLELAWCO)	19.8	18.2	45.1	+26.9	2.1	Unaccounted +26.9 cfs gain over 2.1 mi. No structure clearly responsible — possible ungaged return flow, baseflow from groundwater, or unmodeled tributary inflow.
RALSTON CREEK	RALSTON CREEK ABOVE CLEAR CREEK CONFLUENCE (RALCCKCO)	57.2	20.4	4.9	-15.5	4.1	Unaccounted -15.5 cfs loss over 4.1 mi. Likely cause: stale/missing diversion data at SEA OF TRANQUILLITY RES.
MAINSTEM	WEST FORK CLEAR CREEK ABV MOUTH NR EMPIRE, CO (WFCEMPCO)	17.7	29.2	18.2	-10.9	0.3	Unaccounted -10.9 cfs loss over 0.3 mi. No structure clearly responsible — possible ungaged diversion, channel seepage / phreatophyte loss, or evapotranspiration.
SOUTH CLEAR CREEK	GREEN LAKE SEEPAGE IMPACT POINT (GNLKSPCO)	10.1	0.1	7.6	+7.5	2.1	Unaccounted +7.5 cfs gain over 2.1 mi. Diversions in this reach with stale data (CLEAR LAKE RES) — under-reporting could mask an offsetting loss.
MAINSTEM	CLEAR CREEK AT DERBY (CLEDERCO)	62.2	0.0	7.5	+7.5	8.7	Unaccounted +7.5 cfs gain over 8.7 mi. Likely cause: stale/missing return data at PROSPECT PARK LAKE.

Gage ⇅	Station ⇅	Avg cfs Aug 17–Aug 23 ⇅	% Hist Median ⇅	Rank ⇅	Δ1wk ⇅	Δ4wk ⇅	Yrs ⇅	Status ⇅
RCCRELCO	RALSTON-CLEAR CREEK CANAL RELEASE TO CLEAR CREEK	0.0	0%	0	+0	+0	0.0	NO_DATA
CRSAS1CO	COORS AUG STATION NO 1	0.0	0%	0	+0	+0	0.0	NO_DATA
DORYINCO	DORY LAKE INLET DITCH	0.0	0%	0	+0	+0	0.0	NO_DATA
SWADITCO	SWADLEY DITCH	0.5	25%	0	-0	+0	4.6	STALE
CHUAUGCO	CHURCH DITCH TO CLEAR CREEK (BLACK HAWK AUG RETURN)	0.0	0%	0	+0	+0	6.9	STALE
RCCDIVCO	RALSTON-CLEAR CREEK CANAL	0.0	0%	0	+0	+0	4.7	STALE
CRSHW2CO	COORS HOT WELL #2 COOLING WATER RETURN	6.2	169%	53	-0	-7	10.4	STALE
FALIDACO	FALL RIVER NEAR IDAHO SPRINGS, CO.	11.0	45%	0	+2	-4	19.6	SHORT_RECORD
RALCRKCO	RALSTON CREEK ABOVE RALSTON RESERVOIR NEAR GOLDEN	0.0	0%	0	+0	-0	28.4	SHORT_RECORD
CLEGLKCO	CLEAR CR. ABV. GEORGETOWN LAKE NR GEORGETOWN, CO	28.5	44%	0	-4	-9	20.5	SHORT_RECORD
LSEDITCO	LEE STEWART ESKINS DITCH	0.2	5%	0	-1	-2	10.5	SHORT_RECORD
COADITCO	COLORADO AGRICULTURAL DITCH	0.0	0%	0	+0	+0	9.9	SHORT_RECORD
0700553A	CROKE CANAL	0.1	3%	0	-0	-5	0.7	SHORT_RECORD
0201700A	CROKE CANAL INLET TO STANDLEY RESERVOIR	0.0	0%	0	+0	+0	1.4	SHORT_RECORD
CRSAP3CO	COORS APOD #3 DIVERSION	0.0	0%	0	+0	+0	10.9	SHORT_RECORD
GDNEMSCO	GOLDEN EMERGENCY SUPPLY	0.0	0%	0	+0	+0	10.9	SHORT_RECORD
AGGDITCO	AGRICULTURAL DITCH	15.8	58%	0	+2	+0	10.2	SHORT_RECORD
RMTRTNCO	ROCKY MOUNTAIN DITCH RETURN TO CLEAR CREEK	0.0	0%	0	+0	+0	10.8	SHORT_RECORD
RALBLWCO	RALSTON CREEK BELOW RALSTON RESERVOIR	0.1	12%	0	-0	-8	10.7	SHORT_RECORD
FHLDITCO	FARMERS HIGHLINE CANAL	42.2	70%	0	-3	-3	10.4	SHORT_RECORD
KERSHTCO	SHEETS PONDS FROM KERSHAW DITCH	0.0	0%	0	+0	+0	9.9	SHORT_RECORD
FHLSTACO	FARMERS HIGHLINE TO STANDLEY LAKE	20.5	56%	0	-4	-3	10.6	SHORT_RECORD
JBROUTCO	JIM BAKER RESERVOIR OUT TO CLEAR CREEK	0.0	0%	0	+0	+0	10.4	SHORT_RECORD
RNJDITCO	RENO JUCHEM DITCH	0.0	0%	0	+0	-0	10.0	SHORT_RECORD
CHUDITCO	CHURCH DITCH	0.0	0%	0	+0	+0	10.2	SHORT_RECORD
WLFDITCO	WOLFF DITCH	0.0	0%	0	+0	-0	6.2	SHORT_RECORD
LOMOUTCO	LOCH LOMOND RESERVOIR OUTLET	5.1	26%	0	+3	+3	3.3	SHORT_RECORD
RALCCKCO	RALSTON CREEK ABOVE CLEAR CREEK CONFLUENCE	4.9	50%	0	-1	-0	4.5	SHORT_RECORD
CRSHW1CO	COORS HOT WELL #1 COOLING WATER RETURN	0.0	0%	0	+0	-0	10.6	SHORT_RECORD
CLPDICCO	CLEAR CR PLATTE RIVER DITCH	8.1	55%	0	-12	-13	1.2	SHORT_RECORD
COOB7LCO	COORS B7 LAKE FROM WANNAMAKER DITCH	0.4	18%	0	-0	-0	10.2	SHORT_RECORD
LDCWESCO	LITTLE DRY CREEK AT WESTMINSTER, CO	0.8	37%	0	+0	-0	8.8	SHORT_RECORD
WGLINLCO	WEST GRAVEL LAKES COMBINED	2.7	32%	0	-1	-6	7.1	SHORT_RECORD
CHURALCO	CHURCH DITCH RETURN TO RALSTON FOR NORTHGLENN	0.0	0%	0	+0	+0	8.4	SHORT_RECORD
SIGDITCO	FARMERS HIGHLINE SIGNAL DITCH	0.0	0%	0	-0	+0	7.6	SHORT_RECORD
BRNINLCO	BRANNAN LAKES INLET	0.0	0%	0	+0	+0	7.3	SHORT_RECORD
SWLDITCO	SWADLEY-LONGAN DITCH	0.3	25%	0	-0	-1	4.7	SHORT_RECORD
WDSSUBCO	WADSWORTH SUBSTITUTION	0.3	29%	0	-1	-1	5.8	SHORT_RECORD
POMFDRCO	POMONA FEEDER DITCH	0.0	0%	0	+0	+0	5.9	SHORT_RECORD
GNLKSPCO	GREEN LAKE SEEPAGE IMPACT POINT	0.1	45%	0	-0	-0	4.4	SHORT_RECORD
SOCOUTCO	SODA CREEK POND OUTLET	0.0	0%	0	+0	-0	5.9	SHORT_RECORD
ARVINLCO	ARVADA (BLUNN) RESERVOIR INLET FROM RALSTON CREEK	0.0	0%	0	-0	-7	5.1	SHORT_RECORD
MTOLPICO	MOUNT OLIVET PIPLELINE	0.2	39%	0	-0	-0	3.6	SHORT_RECORD
LBBINLCO	LOWER BEAVER BROOK INLET	0.2	53%	0	+0	+0	3.3	SHORT_RECORD
HPQDITCO	HAINES PIQUETTE DITCH	0.0	0%	0	+0	-0	3.6	SHORT_RECORD
LEBATLCO	LEE AND BAUGH DITCH TAIL	0.1	73%	0	-0	-0	1.7	SHORT_RECORD
WDSDITCO	WADSWORTH DITCH	0.4	54%	1	-1	-1	6.3	SHORT_RECORD
NBBABBCO	NORTH BEAVER BROOK AT BEAVER BROOK CONFLUENCE	0.2	57%	3	+0	+0	3.3	SHORT_RECORD
FALOUTCO	FALL RIVER RESERVOIR OUTLET	5.3	44%	5	-1	-5	3.6	SHORT_RECORD
RMTDITCO	ROCKY MOUNTAIN DITCH	7.9	43%	6	-0	-2	10.8	SHORT_RECORD
GDNRWSCO	GOLDEN RAW WATER SUPPLY	7.2	83%	6	+1	+0	10.9	SHORT_RECORD
KERDITCO	KERSHAW DITCH	2.0	91%	7	-0	-0	10.3	SHORT_RECORD
FHLAUGCO	FARMERS HIGHLINE RETURN TO CLEAR CREEK FOR COORS	1.8	74%	11	-0	+0	10.4	SHORT_RECORD
ARVAUGCO	ARVADA CROKE CANAL RELEASE TO RALSTON CREEK	0.5	63%	14	-0	-0	10.7	SHORT_RECORD
LEEBAUCO	LEE AND BAUGH DITCH	0.5	62%	15	-0	-1	8.0	SHORT_RECORD
CRSINDCO	COORS IND DITCH	45.8	80%	16	-3	-4	10.6	SHORT_RECORD
FARHLGCO	FARMERS HIGHLINE GAYNO RT TO CLEAR CREEK	0.1	64%	17	+0	+0	10.2	SHORT_RECORD
CHIDEVCO	CHICAGO CREEK BLW DEVILS CANYON NR IDAHO SPRGS C	7.7	47%	18	+0	+3	15.5	SHORT_RECORD
GDNNPPCO	GOLDEN NON-POTABLE PUMP	1.3	76%	24	+0	-0	10.9	SHORT_RECORD
FISCOPCO	FISHER DITCH DELIVERY TO CHEROKEE POWER PLANT	0.0	0%	25	+0	+0	13.7	SHORT_RECORD
AGGRTNCO	AGRICULTURAL DITCH RETURN TO CLEAR CREEK	0.0	8%	27	-0	-0	10.8	SHORT_RECORD
FHLRALCO	FARMERS HIGHLINE RETURN TO RALSTON FOR WESTMINSTER	0.5	80%	27	-0	+0	10.0	SHORT_RECORD
GDNNPFCO	GOLDEN NON-POTABLE FLUME	1.2	72%	29	-0	-0	10.9	SHORT_RECORD
WANDITCO	WANNAMAKER DITCH	7.8	86%	32	-0	-0	10.9	SHORT_RECORD
LVNGEOCO	LEAVENWORTH CREEK AT MOUTH NEAR GEORGETOWN, CO	7.9	83%	37	-1	-3	23.3	SHORT_RECORD
COOTRECO	COORS TREATMENT BACKWASH RETURN TO CLEAR CREEK	0.8	88%	41	+0	+0	9.9	SHORT_RECORD
FHLARVCO	FARMERS HIGHLINE RETURN TO RALSTON CREEK FOR ARVADA	0.1	74%	43	-0	-0	8.8	SHORT_RECORD
COOB4LCO	COORS B4 LAKE FROM ROCKY MOUNTAIN DITCH	5.6	96%	46	+0	-0	8.6	SHORT_RECORD
UBBOUTCO	UPPER BEAVER BROOK RESERVOIR OUTLET	0.2	0%	50	+0	+0	0.2	SHORT_RECORD
CHIIDSCO	CHICAGO CREEK BELOW IDAHO SPRINGS RESERVOIR	3.2	125%	56	+0	+2	7.5	SHORT_RECORD
CRSRTNCO	COORS COOLING WATER RETURN BELOW INLET	34.1	111%	58	-2	+3	10.6	SHORT_RECORD
GUAINFCO	GUANELLA RESERVOIR INFLOW	1.9	128%	58	-0	-0	20.3	SHORT_RECORD
SLUDITCO	SLOUGH DITCH	9.5	115%	58	-6	+3	9.2	SHORT_RECORD
KERRTNCO	KERSHAW DITCH RETURN TO CLEAR CREEK	6.2	120%	62	+1	+0	10.0	SHORT_RECORD
LBBOUTCO	LOWER BEAVER BROOK OUTLET	0.1	186%	64	+0	+0	3.6	SHORT_RECORD
FISDITCO	FISHER DITCH	13.8	112%	67	+3	+4	10.1	SHORT_RECORD
GUAOUTCO	GUANELLA RESERVOIR (OUTFLOW)	5.9	137%	71	-1	+1	21.1	SHORT_RECORD
CGSEWECO	COORS GOLDEN SEWER EFFLUENT	10.4	182%	89	-0	+1	6.0	SHORT_RECORD
COOBY2CO	COORS BYPASS GATE 2	4.9	425%	92	-1	+5	5.7	SHORT_RECORD
JBRINLCO	JIM BAKER RESERVOIR INLET FROM MANHART	0.1	0%	92	+0	+0	9.6	SHORT_RECORD
WANAUGCO	WANNAMAKER AUGMENTATION RETURN TO CLEAR CREEK	6.1	123%	100	+0	+1	10.9	SHORT_RECORD
FISRTNCO	FISHER DITCH RETURN	9.6	213%	100	+2	+3	9.5	SHORT_RECORD
ARVRCKCO	ARVADA (BLUNN) RESERVOIR RELEASE TO RALSTON CREEK	0.1	473%	100	-0	-0	10.7	SHORT_RECORD
SLGAUGCO	SLOUGH DITCH AUG STATION	7.9	6455%	100	-3	+8	9.9	SHORT_RECORD
MAHDITCO	MANHART DITCH	0.1	0%	100	+0	+0	9.8	SHORT_RECORD
BLUDITCO	BLUE DITCH PIPELINE	0.6	189%	100	+0	+0	7.3	SHORT_RECORD
LCCWSCCO	CC PRD WEST SPRAT-PLATTE PIT	3.7	16798%	100	+0	+4	7.3	SHORT_RECORD
ARVRDBCO	ARVADA RALSTON CREEK BYPASS	0.0	486%	100	-0	-0	3.3	SHORT_RECORD
JOPOUTCO	JOHNS POND OUTLET	4.3	856%	100	+4	+4	3.6	SHORT_RECORD
CLELAWCO	CLEAR CREEK NEAR LAWSON, CO	45.1	42%	0	-10	-22	78.2	OK
CLEGOLCO	CLEAR CREEK AT GOLDEN, CO	61.9	42%	0	-14	-24	51.8	OK
CLEWFOCO	CLEAR CREEK ABV WEST FORK CLEAR CREEK NR EMPIRE CO	29.2	45%	0	-4	-9	30.5	OK
WFCEMPCO	WEST FORK CLEAR CREEK ABV MOUTH NR EMPIRE, CO	18.2	44%	0	-6	-11	31.7	OK
NCCBLACO	NORTH CLEAR CREEK ABOVE MOUTH NR BLACK HAWK, CO	1.9	38%	0	-1	+0	31.8	OK
STCTUNCO	STRAIGHT CR. TUNNEL AT EAST PORTAL OF EISENHOWER	0.2	57%	0	-0	-0	31.8	OK
CLEDERCO	CLEAR CREEK AT DERBY	7.5	42%	13	-1	+5	100.1	OK
BERDITCO	BERTHOUD PASS DITCH AT BERTHOUD PASS, CO.	0.1	12%	28	-0	+0	82.7	OK
VIDTUNCO	VIDLER TUNNEL NEAR ARGENTINE PASS	0.0	13%	28	+0	-1	55.3	OK