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WARREN LAKE RES

Structure dossier · WDID 0303804 · RESERVOIR · CACHE LA POUDRE RIVER · DWR record

Source DWR administrative record · verify at DWR structure ↗ Source DWR administrative record · verify at DWR diversion records ↗ Source Our computation, scored against a reference · scored against DWR's call analysis, see /methods

Where this page's figures come from

Generated 2026-10-13 18:43 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260928 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (dd58e60) — every figure regenerates from this named code version and data image.

The record and the river

Download this structure

Everything on this page as data you can work with — and a README that makes it citable: the HydroBase snapshot it was built from, the build commit, what every column means, the method behind each derived figure, and that method's stated limits.

⇩ Full record (.zip) Print / save as PDF

Or one table at a time: rights.csv · annual_use.csv · curtailment_now.csv · court_cases.csv · co_parties.csv · call_climatology.csv

What is in the bundle
  • rights.csv — every decreed right, most senior first, with admin numbers, dates, amounts, uses and case numbers.
  • annual_use.csv — recorded diversion by year, with releases accounted separately.
  • curtailment_now.csv — each right's current priority status and how often it was out across analog years.
  • court_cases.csv — the cases attached to its rights.
  • co_parties.csv — the other structures that were parties to those cases. Not available anywhere else.
  • call_climatology.csv — how often each right has been out of priority by week of season, with confidence intervals and the seasons the record could actually judge.
  • README.txt — provenance, methods, limits, disclaimer, and links back to DWR's own records for verification.

Where it sits

Location as DWR records it (storage). Faint dots are the neighbouring water; click any to open it.

Dam safety

Dam WARREN LAKE (completed 1882)
Hazard class High
Condition at last inspection Satisfactory (2025-04-11)
Storage restriction None on file
Normal storage 2,185 AF
Physical status Active
Emergency action plan Yes

Source: DWR Dam Safety’s jurisdictional-dam inventory (damsafety/damsafetydaminfojd), refreshed weekly. Joined on this structure’s own WDID as DWR records it on the dam. Hazard class describes the consequence of failure, not the likelihood of it. DWR’s dam record.

Current administration

● Junior rights called out — call at CANAL 3 DITCH (CACHE LA POUDRE RIVER, priority 1870-04-01).

● Junior rights called out — call at OGILVY DITCH (CACHE LA POUDRE RIVER, priority 1884-04-10).

● Junior rights called out — call at B H EATON DITCH (CACHE LA POUDRE RIVER, priority 1864-04-01).

Which of its rights are out of priority?

The outlook for the weeks ahead is not computable for this structure: no administrative call record for this basin. Today’s position is a separate question, and it is answered in Current administration above — that screen reads the district’s active calls and needs no reference gage.

Where it sits in line

Priority 1861-06-01 — 32nd most senior of the 2964 structures with decreed rights in this water districtDWR's administrative subdivision of a river basin; the unit calls are usually stated in..

Under prior appropriationColorado's rule for sharing water: first in time, first in right. Age decides, not proximity or need., everything ahead of it in this line is satisfied in full before it receives any water. Immediately ahead: CLAYMORE LAKE RES (1861-06-01). Immediately behind: DRY CREEK DITCH (1861-06-10).

On MAINSTEM at river mile 124.3, it is 512th of 818 down the reach. Immediately upstream: RAWHIDE PIPELINE. Immediately downstream: BOUCHARD POND.

Position on the modelled network, not a claim about whose water this is — a stream carries water from many rights at once, and diverted water returns to it.

Decreed rights (21)

Admin noDWR's numeric encoding of a water right's seniority. Smaller is more senior; the integer part counts days from 1849-12-31 to the date that ranks the right. AppropriatedWhen water was first put to beneficial use. It sets seniority unless a prior adjudication date is later. AdjudicatedWhen the water court confirmed the right. A use decreed in 1975 was not a decreed use in 1955, however old the appropriation is. AbsoluteA right actually put to use, as opposed to conditional -- a placeholder for a use not yet made. ConditionalA right reserving a place in line for a use not yet made; it must be diligently pursued or it lapses. Alt-pointAn absolute amount decreed at another structure that may be diverted here instead -- an alternate point of diversion or an exchange. DWR calls this the APEX amount; a right showing 0.0 absolute but an alt-point amount is exercised here under another structure's decree. Decreed forWhat the court said this water may be used for -- irrigation, municipal supply, augmentation and so on.Case
4170.00000 1861-06-011882-04-11 0.0 cfs 0.0 0.2768 cfs Municipal 92CW0129, 05CW0323
6026.00000 1866-07-011882-04-11 0.0 cfs 0.0 0.8325 cfs Municipal 92CW0129, 05CW0323
6483.00000 1867-10-011882-04-11 0.0 cfs 0.0 3.5561 cfs Municipal 92CW0129, 05CW0323
6727.00000 1868-06-011882-04-11 0.0 cfs 0.0 0.8325 cfs Municipal 92CW0129, 05CW0323
7092.00000 1869-06-011882-04-11 0.0 cfs 0.0 0.6422 cfs Municipal 92CW0129, 05CW0323
7184.00000 1869-09-011882-04-11 0.0 cfs 0.0 1.8167 cfs Municipal 92CW0129, 05CW0323
7761.00000 1871-04-011882-04-11 0.0 cfs 0.0 12.1787 cfs Municipal 92CW0129, 05CW0323
7953.00000 1871-10-101882-04-11 0.0 cfs 0.0 3.6291 cfs Municipal 92CW0129, 05CW0323
8218.00000 1872-07-011882-04-11 0.0 cfs 0.0 6.2852 cfs Municipal 92CW0129, 05CW0323
8237.00000 1872-07-201882-04-11 0.0 cfs 0.0 8.6828 cfs Municipal 92CW0129, 05CW0323
8492.00000 1873-04-011882-04-11 0.0 cfs 0.0 96.7758 cfs Municipal 92CW0129, 05CW0323
8645.00000 1873-09-011882-04-11 0.0 cfs 0.0 21.3027 cfs Municipal 92CW0129, 05CW0323
9236.00000 1875-04-151882-04-11 496.0 AF 0.0 — Irrigation, Municipal 92CW0129, CA0320 +2
11003.00000 1880-02-151882-04-11 0.0 cfs 0.0 21.9885 cfs Municipal 05CW0323, 92CW0129
15716.00000 1893-01-101904-12-09 1545.0 AF 0.0 — Irrigation, Municipal CA1591, 92CW0129 +1
21392.00000 1908-07-271922-04-22 818.0 AF 0.0 — Irrigation, Municipal 92CW0129, CA2031 +1
35050.08218 1872-07-011953-09-10 0.0 cfs 0.0 11.981 cfs Municipal 92CW0129, 05CW0323
35050.08492 1873-04-011953-09-10 0.0 cfs 0.0 96.7758 cfs Municipal 05CW0323, 92CW0129
35050.10736 1879-05-241953-09-10 0.0 cfs 0.0 40.5178 cfs Municipal 05CW0323, 92CW0129
35050.11003 1880-02-151953-09-10 0.0 cfs 0.0 59.2519 cfs Municipal 05CW0323, 92CW0129
46751.20669 1906-08-041978-12-31 0.0 AF 0.0 134.8195 AF Municipal 92CW0129, 05CW0323

Amounts marked cfs are flow rates; AF are stored volumes (storage rights are decreed in acre-feet). An absolute amount of 0.0 beside an alt-point amount is not a dead right: the water is decreed at another structure, and that row records permission to divert it here instead (an alternate point or exchange). A case listing several numbers reflects the original decree plus later change cases.

Recorded use (last 15 years on record)

Years far under the decreed amount? That gap has a name — paper water vs. wet water, explained on this structure.

In a median year this structure has a recorded diversion of 448 AF. Its most recent year on record, 2025, came in at 0 AF — 0% of that, and 1st lowest of the 8 years with a recorded volume.

This structure records both diversions and reservoir releases — they are separate water movements and are accounted separately below.

YearDiverted (AFA volume: one acre covered a foot deep, about 326,000 gallons -- roughly a suburban household's outdoor use for a year.)Compared with its own recordReleased (AF)Days recordedPeak (cfs)
2002 — no recorded volume 1,330 0 —
2003 — no recorded volume 1,536 0 —
2004 — no recorded volume 1,558 0 —
2005 — no recorded volume 1,879 0 —
2006 — no recorded volume 1,896 0 —
2007 — no recorded volume 1,328 0 —
2008 — no recorded volume 1,118 0 —
2009 1,107 6th lowest of 8 · 247% of median 1,301 20 37.0
2010 1,690 8th lowest of 8 · 377% of median 1,482 111 87.0
2011 1,612 7th lowest of 8 · 359% of median — 18 81.0
2012 897 5th lowest of 8 · 200% of median — 19 44.2
2022 0 1st lowest of 8 · 0% of median — 7 0.0
2023 0 1st lowest of 8 · 0% of median — 7 0.0
2024 0 1st lowest of 8 · 0% of median — 7 0.0
2025 0 1st lowest of 8 · 0% of median — 7 0.0

How good is our record of it?

Grade B (7/10 points) — the components below are the finding; the letter alone is not.

The rubric, component by component
CheckStateDetail
identity complete name, type, and water source all on file
decreed rights on file 21 right(s), seniority decoded
diversion record stale 3168 measured days, but newest is 525 day(s) before the data's end (target 450)
record continuity sparse 28% of the irrigation seasons in 1973-2025 carry measured days
published-record stability stable no upstream revisions recorded against this structure

Advisory reading aid on public data — not an administrative or legal conclusion, not a title opinion, and not a substitute for DWR administration or an engineer's analysis. Methodology review status is disclosed at hydrohistorian's basin pages.

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