Hydrohistorian
← My Water · Print / save as PDF
UNION DITCH
Structure dossier · WDID 1200835 · 1 · ARKANSAS RIVER · DWR record
Where this page's figures come from
Generated 2026-08-27 20:29 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 get called out?
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 1861-11-30 — 21st most senior of the 1967 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: MINNEQUA CANAL (1861-07-22). Immediately behind: ROCKY MTN MATERIALS PUMP (1861-11-30).
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 |
|---|---|---|---|---|---|---|---|
| 4352.0 | 1861-11-30 | 1894-02-03 | 46.787 | 0.0 | C | IRRMUNCOMINDRECFIRDOMSTKAUGWLD | 10 |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 6,380 AF. Its most recent year on record, 2025, came in at 9,174 AF — 144% of that, and 14th lowest of the 15 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) |
|---|---|---|---|---|
| 2007 | 6,372 | 7th lowest of 15 · 100% of median | 365 | 14.0 |
| 2008 | 6,274 | 6th lowest of 15 · 98% of median | 366 | 16.1 |
| 2009 | 6,499 | 10th lowest of 15 · 102% of median | 304 | 16.0 |
| 2010 | 222 | 2nd lowest of 15 · 4% of median | 15 | 10.2 |
| 2011 | 6,380 | 8th lowest of 15 · 100% of median | 235 | 17.0 |
| 2012 | 6,488 | 9th lowest of 15 · 102% of median | 202 | 19.2 |
| 2017 | 0 | 1st lowest of 15 · 0% of median | 1 | 0.0 |
| 2018 | 5,931 | 5th lowest of 15 · 93% of median | 260 | 17.0 |
| 2019 | 5,273 | 4th lowest of 15 · 83% of median | 214 | 15.6 |
| 2020 | 5,162 | 3rd lowest of 15 · 81% of median | 271 | 24.0 |
| 2021 | 10,889 | 15th lowest of 15 · 171% of median | 365 | 24.4 |
| 2022 | 8,988 | 13th lowest of 15 · 141% of median | 365 | 24.8 |
| 2023 | 8,094 | 11th lowest of 15 · 127% of median | 365 | 22.7 |
| 2024 | 8,328 | 12th lowest of 15 · 130% of median | 366 | 24.5 |
| 2025 | 9,174 | 14th lowest of 15 · 144% of median | 304 | 25.8 |
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.