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UNION D
Structure dossier · WDID 2100602 · 1 · ALAMOSA RIVER · DWR record
Where this page's figures come from
Generated 2026-08-27 19:53 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 in line
Priority 1876-05-20 — 47th most senior of the 1041 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: T K WALSH D (1876-05-01). Immediately behind: NORTH ALAMOSA D (1877-06-14).
Decreed rights (3)
| 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 |
|---|---|---|---|---|---|---|---|
| 9637.0 | 1876-05-20 | 1888-07-11 | 14.13 | 0.0 | C | IRRDOM | 38 |
| 11894.0 | 1882-07-25 | 1888-07-11 | 27.21 | 0.0 | C | IRR | 62 |
| 12554.0 | 1884-05-15 | 1888-07-11 | 28.15 | 0.0 | C | IRRDOM | 67 |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 2,263 AF. Its most recent year on record, 2025, came in at 1,130 AF — 50% of that, and 5th 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) |
|---|---|---|---|---|
| 2011 | 2,118 | 7th lowest of 15 · 94% of median | 38 | 51.3 |
| 2012 | 294 | 2nd lowest of 15 · 13% of median | 16 | 14.2 |
| 2013 | 152 | 1st lowest of 15 · 7% of median | 10 | 13.6 |
| 2014 | 2,715 | 11th lowest of 15 · 120% of median | 47 | 67.9 |
| 2015 | 2,394 | 9th lowest of 15 · 106% of median | 26 | 71.1 |
| 2016 | 3,272 | 14th lowest of 15 · 145% of median | 59 | 69.5 |
| 2017 | 3,343 | 15th lowest of 15 · 148% of median | 85 | 69.5 |
| 2018 | 725 | 4th lowest of 15 · 32% of median | 27 | 41.3 |
| 2019 | 2,953 | 13th lowest of 15 · 130% of median | 88 | 45.0 |
| 2020 | 696 | 3rd lowest of 15 · 31% of median | 29 | 17.5 |
| 2021 | 2,520 | 10th lowest of 15 · 111% of median | 47 | 69.5 |
| 2022 | 2,263 | 8th lowest of 15 · 100% of median | 45 | 55.0 |
| 2023 | 2,730 | 12th lowest of 15 · 121% of median | 79 | 50.0 |
| 2024 | 1,678 | 6th lowest of 15 · 74% of median | 50 | 50.0 |
| 2025 | 1,130 | 5th lowest of 15 · 50% of median | 39 | 47.0 |
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.