Hydrohistorian
← My Water · Print / save as PDF
ALUM GULCH DITCH
Structure dossier · WDID 4000506 · 1 · ALUM GULCH · DWR record
Where this page's figures come from
Generated 2026-08-27 20:50 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 1905-06-01 — 1344th most senior of the 4661 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: LITTLE MARY DITCH (1905-04-15). Immediately behind: TODD RESERVOIR (1905-07-10).
Decreed rights (2)
| 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 |
|---|---|---|---|---|---|---|---|
| 24894.2024 | 1905-06-01 | 1920-08-28 | 2.0 | 0.0 | C | IRR | B20 |
| 35854.0 | 1948-03-01 | 1954-03-20 | 7.0 | 0.0 | C | IRR | J298 |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 1,549 AF. Its most recent year on record, 2024, came in at 1,932 AF — 125% of that, and 11th 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) |
|---|---|---|---|---|
| 2010 | 3,090 | 15th lowest of 15 · 200% of median | 208 | 11.3 |
| 2011 | 2,621 | 14th lowest of 15 · 169% of median | 214 | 13.0 |
| 2012 | 965 | 2nd lowest of 15 · 62% of median | 210 | 8.0 |
| 2013 | 1,333 | 5th lowest of 15 · 86% of median | 211 | 8.0 |
| 2014 | 1,834 | 9th lowest of 15 · 118% of median | 212 | 10.0 |
| 2015 | 1,430 | 7th lowest of 15 · 92% of median | 206 | 10.0 |
| 2016 | 1,882 | 10th lowest of 15 · 122% of median | 207 | 9.2 |
| 2017 | 2,246 | 13th lowest of 15 · 145% of median | 212 | 10.6 |
| 2018 | 473 | 1st lowest of 15 · 30% of median | 205 | 4.9 |
| 2019 | 2,185 | 12th lowest of 15 · 141% of median | 212 | 8.0 |
| 2020 | 1,144 | 4th lowest of 15 · 74% of median | 188 | 6.8 |
| 2021 | 1,015 | 3rd lowest of 15 · 66% of median | 206 | 7.0 |
| 2022 | 1,393 | 6th lowest of 15 · 90% of median | 175 | 9.0 |
| 2023 | 1,549 | 8th lowest of 15 · 100% of median | 180 | 6.0 |
| 2024 | 1,932 | 11th lowest of 15 · 125% of median | 190 | 8.0 |
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.