Hydrohistorian
← My Water · Print / save as PDF
AHRENS DITCH
Structure dossier · WDID 5900503 · 1 · EAST 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 1886-06-01 — 115th 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: BAGG DITCH (1886-05-31). Immediately behind: CEMENT CREEK DITCH (1886-06-01).
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 |
|---|---|---|---|---|---|---|---|
| 13301.0 | 1886-06-01 | 1906-09-14 | 4.0 | 0.0 | C | IRR | 56 |
| 30667.1327 | 1886-05-01 | 1941-04-29 | 26.0 | 0.0 | C | IRR | 319 |
| 31228.0 | 1935-07-02 | 1941-04-29 | 11.0 | 0.0 | C | IRR | 472 |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 713 AF. Its most recent year on record, 2025, came in at 412 AF — 58% of that, and 6th 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 | 1,232 | 14th lowest of 15 · 173% of median | 170 | 14.8 |
| 2012 | 332 | 5th lowest of 15 · 47% of median | 197 | 3.2 |
| 2013 | 807 | 9th lowest of 15 · 113% of median | 178 | 12.4 |
| 2014 | 3,028 | 15th lowest of 15 · 425% of median | 160 | 25.7 |
| 2015 | 887 | 10th lowest of 15 · 124% of median | 191 | 12.4 |
| 2016 | 189 | 1st lowest of 15 · 26% of median | 153 | 2.4 |
| 2017 | 992 | 11th lowest of 15 · 139% of median | 190 | 7.9 |
| 2018 | 198 | 2nd lowest of 15 · 28% of median | 164 | 2.4 |
| 2019 | 713 | 8th lowest of 15 · 100% of median | 177 | 5.4 |
| 2020 | 217 | 3rd lowest of 15 · 30% of median | 156 | 1.6 |
| 2021 | 260 | 4th lowest of 15 · 36% of median | 168 | 2.4 |
| 2022 | 598 | 7th lowest of 15 · 84% of median | 132 | 5.4 |
| 2023 | 1,054 | 12th lowest of 15 · 148% of median | 177 | 7.5 |
| 2024 | 1,068 | 13th lowest of 15 · 150% of median | 150 | 11.2 |
| 2025 | 412 | 6th lowest of 15 · 58% of median | 178 | 2.9 |
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.