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PIONEER UNION DITCH
Structure dossier · WDID 0900862 · 1 · BEAR CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 21:17 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 1861-06-01 — 9th most senior of the 2058 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: HODGSON DITCH (1861-06-01). Immediately behind: GENESEE MOUNTAIN PL (1861-06-01).
Decreed rights (9)
| 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 |
|---|---|---|---|---|---|---|---|
| 4170.0 | 1861-06-01 | 1884-02-04 | 0.0248 | 0.0 | C | IRR | |
| 4353.0 | 1861-12-01 | 1884-02-04 | 0.0 | 0.0 | C | MUNALL | |
| 4362.0 | 1861-12-10 | 1884-02-04 | 5.4381 | 0.0 | C | IRRMUNCOMINDRECFISFIRDOMAUGPWR | |
| 4489.0 | 1862-04-16 | 1884-02-04 | 0.0 | 0.0 | C | MUNALL | |
| 4627.0 | 1862-09-01 | 1884-02-04 | 1.6856 | 0.0 | C | IRRMUNCOMINDRECFISFIRDOMSTKAUG | |
| 5418.0 | 1864-10-31 | 1884-02-04 | 0.0 | 0.0 | C | MUNALL | |
| 5553.0 | 1865-03-15 | 1884-02-04 | 5.2151 | 0.0 | C | IRRMUNCOMINDRECFISFIRDOMAUGPWR | |
| 5570.0 | 1865-04-01 | 1884-02-04 | 0.0 | 0.0 | C | MUNALL | |
| 51331.0 | 1990-07-16 | 1990-12-31 | 5.0 | 0.0 | C | STOIRRRECFISAUG |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 645 AF. Its most recent year on record, 2024, came in at 789 AF — 122% of that, and 13th 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 | 1,208 | 15th lowest of 15 · 187% of median | — | 225 | 7.2 |
| 2011 | 946 | 14th lowest of 15 · 147% of median | — | 229 | 4.5 |
| 2012 | 577 | 6th lowest of 15 · 90% of median | — | 221 | 2.5 |
| 2013 | 512 | 1st lowest of 15 · 79% of median | — | 183 | 2.7 |
| 2014 | 524 | 2nd lowest of 15 · 81% of median | — | 203 | 4.9 |
| 2015 | 567 | 4th lowest of 15 · 88% of median | — | 203 | 4.7 |
| 2016 | 686 | 11th lowest of 15 · 106% of median | — | 207 | 2.5 |
| 2017 | 703 | 12th lowest of 15 · 109% of median | — | 181 | 2.6 |
| 2018 | 558 | 3rd lowest of 15 · 86% of median | — | 191 | 2.8 |
| 2019 | 645 | 8th lowest of 15 · 100% of median | — | 201 | 2.6 |
| 2020 | 653 | 9th lowest of 15 · 101% of median | — | 186 | 2.9 |
| 2021 | 567 | 4th lowest of 15 · 88% of median | — | 157 | 2.9 |
| 2022 | 668 | 10th lowest of 15 · 104% of median | — | 189 | 2.5 |
| 2023 | 591 | 7th lowest of 15 · 92% of median | — | 186 | 2.8 |
| 2024 | 789 | 13th lowest of 15 · 122% of median | — | 225 | 2.8 |
Call-derived yield: senior right divertible 100.0% of a median season / 82.2% dry-year.
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.