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CBT WILLOW CREEK RESERVOIR
Structure dossier · WDID 5103710 · 3 · WILLOW CREEK · DWR record
Where this page's figures come from
Generated 2026-08-28 01:51 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (2deb1d7) — every figure regenerates from this named code version and data image.
Where it sits
Location as DWR records it. Faint dots are the neighbouring water; click any to open it.
Which of its rights are out of priority?
Not computable for this structure: this structure is not on the modelled flow network, so no reference gage can honestly stand in for it.
Where it sits in line
Priority 1935-08-01 — 426th most senior of the 2208 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: CBT SHADOW MOUNTAIN LAKE (1935-08-01). Immediately behind: CBT GRANBY RESERVOIR (1935-08-01).
Decreed rights (1)
| 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. | Units | UsesWhat the court said this water may be used for -- irrigation, municipal supply, augmentation and so on. | Case |
|---|---|---|---|---|---|---|---|
| 31258.0 | 1935-08-01 | 1955-10-12 | 10553.0 | 0.0 | A | IRRINDREC |
Legal record & documents
1 decreed actions on record across
1 court case:
CA2782.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
CA2782 | 1 | 1955-10-12 | O |
DWR's own records for this structure: net amounts · transactions & adjudication history · scanned decrees (search a case number there for the imaged document). On this site: the district's full legal picture →
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 12,492 AF. Its most recent year on record, 2024, came in at 11,115 AF — 89% of that, and 5th lowest of the 15 years with a recorded volume.
This structure records both diversions and reservoir releases — they are separate water movements and are accounted separately below.
| Year | Diverted (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 record | Released (AF) | Days recorded | Peak (cfs) |
|---|---|---|---|---|---|
| 2010 | 13,698 | 12th lowest of 15 · 110% of median | 10,999 | 365 | 327.7 |
| 2011 | 10,243 | 4th lowest of 15 · 82% of median | 10,018 | 365 | 331.2 |
| 2012 | 11,656 | 7th lowest of 15 · 93% of median | 11,239 | 366 | 154.8 |
| 2013 | 12,866 | 9th lowest of 15 · 103% of median | 12,000 | 365 | 331.7 |
| 2014 | 14,364 | 13th lowest of 15 · 115% of median | 15,109 | 304 | 293.0 |
| 2015 | 21,025 | 15th lowest of 15 · 168% of median | 25,694 | 154 | 345.0 |
| 2016 | 12,492 | 8th lowest of 15 · 100% of median | 8,717 | 366 | 251.6 |
| 2017 | 9,532 | 1st lowest of 15 · 76% of median | 12,432 | 365 | 229.9 |
| 2018 | 9,682 | 3rd lowest of 15 · 78% of median | 8,449 | 365 | 228.4 |
| 2019 | 13,634 | 11th lowest of 15 · 109% of median | 12,703 | 365 | 218.1 |
| 2020 | 9,636 | 2nd lowest of 15 · 77% of median | 9,669 | 366 | 169.3 |
| 2021 | 13,242 | 10th lowest of 15 · 106% of median | 12,577 | 365 | 188.9 |
| 2022 | 14,378 | 14th lowest of 15 · 115% of median | 13,439 | 365 | 202.5 |
| 2023 | 11,140 | 6th lowest of 15 · 89% of median | 12,337 | 365 | 337.3 |
| 2024 | 11,115 | 5th lowest of 15 · 89% of median | 9,076 | 305 | 210.8 |
Trends for this structure
Recorded use shows no clear trend over its last 15 recorded years — which is itself worth knowing.
How good is our record of it?
Grade A (9/10 points) — the components below are the finding; the letter alone is not.
The rubric, component by component
| Check | State | Detail |
|---|---|---|
| identity | complete | name, type, and water source all on file |
| decreed rights | on file | 1 right(s), seniority decoded |
| diversion record | present | 17469 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | continuous | 100% of the irrigation seasons in 1974-2024 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.