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UNION DITCH
Structure dossier · WDID 0200828 · DITCH · SOUTH PLATTE RIVER · 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 (0576005) — 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.
Current administration
● Junior rights called out — call at LOWER LATHAM DITCH (SOUTH PLATTE RIVER, priority 1877-11-14).
● Junior rights called out — call at HARMONY DITCH 1 (SOUTH PLATTE RIVER, priority 1897-05-02).
● Junior rights called out — call at SOUTH PLATTE RIVER COMPACT (SOUTH PLATTE RIVER, priority 1897-06-13).
● Junior rights called out — call at LOWER PLATTE BEAVER D (SOUTH PLATTE RIVER, priority 1888-04-14).
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 1873-09-26 — 436th most senior of the 21881 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: BIG BEND DITCH (1873-09-26). Immediately behind: BIG BEND DITCH LEFT IN STREAM (1873-09-26).
Decreed rights (11)
| 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 |
|---|---|---|---|---|---|---|---|
| 8670.0 | 1873-09-26 | 1883-04-28 | 387.0 | 0.0 | A | IRRRECAUGRCH | |
| 8670.0 | 1873-09-26 | 1883-04-28 | 2.0 | 0.0 | C | IRRRECAUGRCH | |
| 9075.0 | 1874-11-05 | 1883-04-28 | 116.5 | 0.0 | A | IRRRECAUGCURRCH | |
| 9075.0 | 1874-11-05 | 1883-04-28 | 100.0 | 0.0 | C | IRRRECAUGCURRCH | |
| 11629.0 | 1881-11-02 | 1883-04-28 | 116.5 | 0.0 | A | IRRRECAUGCURRCH | |
| 11629.0 | 1881-11-02 | 1883-04-28 | 84.03 | 0.0 | C | IRRRECAUGCURRCH | |
| 17706.0 | 1898-06-23 | 1918-08-02 | 183.0 | 0.0 | C | STO | |
| 18437.0 | 1900-06-24 | 1918-08-02 | 183.0 | 0.0 | C | STO | |
| 25050.23959 | 1915-08-07 | 1924-11-12 | 183.0 | 0.0 | C | STO | |
| 56235.0 | 2003-12-19 | 2003-12-31 | 9.3 | 40.7 | C | AUGRCH | |
| 59382.0 | 2012-07-31 | 2012-12-31 | 0.0 | 55.0 | C | AUGRCH |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 37,707 AF. Its most recent year on record, 2025, came in at 35,385 AF — 94% of that, and 7th 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) |
|---|---|---|---|---|---|
| 2011 | 4,413 | 1st lowest of 15 · 12% of median | — | 304 | 10.0 |
| 2012 | 37,707 | 8th lowest of 15 · 100% of median | — | 277 | 117.1 |
| 2013 | 33,930 | 6th lowest of 15 · 90% of median | — | 365 | 121.0 |
| 2014 | 43,646 | 15th lowest of 15 · 116% of median | — | 365 | 155.5 |
| 2015 | 32,619 | 5th lowest of 15 · 86% of median | — | 304 | 225.9 |
| 2016 | 27,749 | 2nd lowest of 15 · 74% of median | — | 214 | 127.2 |
| 2017 | 32,168 | 3rd lowest of 15 · 85% of median | — | 212 | 142.4 |
| 2018 | 41,840 | 13th lowest of 15 · 111% of median | — | 216 | 160.5 |
| 2019 | 38,639 | 10th lowest of 15 · 102% of median | — | 213 | 156.7 |
| 2020 | 40,611 | 12th lowest of 15 · 108% of median | — | 224 | 161.6 |
| 2021 | 38,024 | 9th lowest of 15 · 101% of median | — | 209 | 152.0 |
| 2022 | 40,279 | 11th lowest of 15 · 107% of median | — | 272 | 153.2 |
| 2023 | 32,244 | 4th lowest of 15 · 86% of median | — | 365 | 158.6 |
| 2024 | 42,035 | 14th lowest of 15 · 112% of median | — | 366 | 150.3 |
| 2025 | 35,385 | 7th lowest of 15 · 94% of median | — | 304 | 129.5 |
Call-derived yield: senior right divertible 31.6% of a median season / 15.0% 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.