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ONION VALLEY DITCH
Structure dossier · WDID 4000584 · 1 · IRON CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 20:49 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.
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 1959-04-01 — 2010th most senior of the 4661 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: WALKER DOMESTIC PIPELINE (1959-03-24). Immediately behind: DAVIS BROTHERS EXTENSION (1959-04-13).
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 |
|---|---|---|---|---|---|---|---|
| 39902.0 | 1959-04-01 | 1964-01-31 | 3.0 | 0.0 | C | IRR | K163 |
Recorded use (last 8 years on record)
In a median year this structure has a recorded diversion of 82 AF. Its most recent year on record, 1981, came in at 50 AF — 61% of that, and 2nd lowest of the 8 years with a recorded volume.
| 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 | Days recorded | Peak (cfs) |
|---|---|---|---|---|
| 1973 | 102 | 6th lowest of 8 · 124% of median | 61 | 1.0 |
| 1974 | 81 | 3rd lowest of 8 · 99% of median | 42 | 1.0 |
| 1975 | 81 | 3rd lowest of 8 · 99% of median | 52 | 1.0 |
| 1976 | 83 | 5th lowest of 8 · 101% of median | 43 | 1.0 |
| 1977 | 0 | 1st lowest of 8 · 0% of median | 1 | 0.0 |
| 1978 | 245 | 8th lowest of 8 · 299% of median | 65 | 2.5 |
| 1979 | 109 | 7th lowest of 8 · 133% of median | 41 | 2.0 |
| 1981 | 50 | 2nd lowest of 8 · 61% of median | 25 | 1.5 |
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.