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EAST RIVER NO 1 DITCH
Structure dossier · WDID 5900549 · 1 · EAST RIVER · DWR record
Where this page's figures come from
Generated 2026-08-27 21:01 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 1882-07-31 — 81st most senior of the 2360 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: EAST RIVER WELL HEAD (1882-06-15). Immediately behind: HOWE & SHERWOOD IRR D (1882-07-31).
Decreed rights (17)
| 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 |
|---|---|---|---|---|---|---|---|
| 11900.0 | 1882-07-31 | 1906-09-14 | 2.91 | 0.0 | C | IRR | |
| 13666.0 | 1887-06-01 | 1906-09-14 | 4.75 | 0.0 | C | IRR | 63 |
| 14756.0 | 1890-05-26 | 1906-09-14 | 3.625 | 0.0 | C | IRRMUNRECFISDOMSTK | 79 |
| 17055.0 | 1896-09-10 | 1906-09-14 | 1.34 | 0.0 | C | IRR | |
| 19497.0 | 1903-05-20 | 1906-09-14 | 8.875 | 0.0 | C | IRR | 162 |
| 20380.0 | 1905-10-19 | 1906-09-14 | 1.0 | 0.0 | C | IRRMUNRECFISDOMSTK | 176 |
| 23150.0 | 1913-05-20 | 1921-10-25 | 1.875 | 0.0 | C | IRR | 207 |
| 30667.119 | 1882-07-31 | 1941-04-29 | 11.95 | 0.0 | C | IRR | |
| 30667.13666 | 1887-06-01 | 1941-04-29 | 61.25 | 0.0 | C | IRR | 324 |
| 30667.16185 | 1894-04-24 | 1941-04-29 | 2.75 | 0.0 | C | IRR | 355 |
| 30667.19448 | 1903-04-01 | 1941-04-29 | 5.0 | 0.0 | C | IRR | |
| 30667.19671 | 1903-11-10 | 1941-04-29 | 17.625 | 0.0 | C | IRR | 398 |
| 30667.22906 | 1912-09-18 | 1941-04-29 | 5.125 | 0.0 | C | IRR | 424 |
| 37513.0 | 1952-09-15 | 1957-06-20 | 5.0 | 0.0 | C | IRR | 599 |
| 39932.0 | 1959-05-01 | 1961-01-27 | 4.0 | 0.0 | C | IRRSTK | |
| 40569.31592 | 1936-06-30 | 1965-10-28 | 0.0 | 1.0 | C | IRRDOMSTK | 599 |
| 55882.55302 | 2001-05-30 | 2003-12-31 | 0.0 | 0.0 | C | STO |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 18,264 AF. Its most recent year on record, 2025, came in at 24,615 AF — 135% of that, and 13th 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 | 18,680 | 9th lowest of 15 · 102% of median | 129 | 114.3 |
| 2012 | 21,713 | 11th lowest of 15 · 119% of median | 198 | 118.9 |
| 2013 | 15,217 | 6th lowest of 15 · 83% of median | 114 | 115.5 |
| 2014 | 14,109 | 4th lowest of 15 · 77% of median | 100 | 109.9 |
| 2015 | 14,182 | 5th lowest of 15 · 78% of median | 89 | 107.8 |
| 2016 | 13,673 | 3rd lowest of 15 · 75% of median | 109 | 120.7 |
| 2017 | 13,126 | 1st lowest of 15 · 72% of median | 93 | 103.6 |
| 2018 | 18,264 | 8th lowest of 15 · 100% of median | 101 | 114.9 |
| 2019 | 13,411 | 2nd lowest of 15 · 73% of median | 72 | 135.8 |
| 2020 | 23,382 | 12th lowest of 15 · 128% of median | 134 | 169.9 |
| 2021 | 20,923 | 10th lowest of 15 · 115% of median | 172 | 129.8 |
| 2022 | 25,454 | 14th lowest of 15 · 139% of median | 146 | 160.6 |
| 2023 | 30,549 | 15th lowest of 15 · 167% of median | 162 | 195.0 |
| 2024 | 16,924 | 7th lowest of 15 · 93% of median | 121 | 127.9 |
| 2025 | 24,615 | 13th lowest of 15 · 135% of median | 101 | 174.1 |
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.