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WALDEN RESERVOIR
Structure dossier · WDID 4703627 · 3 · ILLINOIS RIVER · DWR record
Where this page's figures come from
Generated 2026-08-27 19:50 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (a1c9146) — every figure regenerates from this named code version and data image.
Where it sits in line
Priority 1954-07-21 — 608th most senior of the 1262 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: FISCHER LAKE (1954-07-03). Immediately behind: MORAINE DITCH (1956-10-01).
Decreed rights (5)
| 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 |
|---|---|---|---|---|---|---|---|
| 38187.0 | 1954-07-21 | 1958-01-10 | 3745.6 | 0.0 | A | IRR | 40, 41C |
| 43829.40365 | 1960-07-07 | 1970-12-31 | 760.9 | 0.0 | A | IRRDOM | |
| 47100.0 | 1978-12-15 | 1978-12-31 | 698.0 | 0.0 | A | STO | |
| 49673.38187 | 1954-07-21 | 1986-12-31 | 1747.0 | 0.0 | A | IRR | |
| 52595.38187 | 1954-07-21 | 1994-12-31 | 1259.0 | 0.0 | A | IRRFISWLD |
Recorded use (last 11 years on record)
In a median year this structure has a recorded diversion of 2,043 AF. Its most recent year on record, 2014, came in at 1,007 AF — 49% of that, and 3rd lowest of the 11 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) |
|---|---|---|---|---|---|
| 2003 | 30 | 1st lowest of 11 · 2% of median | — | 4 | 5.0 |
| 2004 | 2,667 | 8th lowest of 11 · 130% of median | 2,288 | 123 | 111.0 |
| 2005 | 2,043 | 6th lowest of 11 · 100% of median | — | 72 | 93.8 |
| 2006 | 2,125 | 7th lowest of 11 · 104% of median | 2,917 | 63 | 62.3 |
| 2007 | 3,522 | 10th lowest of 11 · 172% of median | 4,719 | 121 | 102.0 |
| 2008 | 3,460 | 9th lowest of 11 · 169% of median | — | 134 | 50.0 |
| 2009 | 1,346 | 4th lowest of 11 · 66% of median | — | 64 | 15.3 |
| 2011 | 775 | 2nd lowest of 11 · 38% of median | 3,292 | 32 | 12.6 |
| 2012 | 1,644 | 5th lowest of 11 · 80% of median | 3,380 | 42 | 48.9 |
| 2013 | 6,274 | 11th lowest of 11 · 307% of median | 1,587 | 116 | 73.4 |
| 2014 | 1,007 | 3rd lowest of 11 · 49% of median | 0 | 55 | 39.0 |
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.