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MCMAHON DITCH (DEER CR)
Structure dossier · WDID 5000762 · 1 · DEER CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 19:17 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 1884-08-15 — 18th most senior of the 360 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: DEER CREEK FEEDER DITCH POINT B (1884-08-15). Immediately behind: PASS CREEK DITCH (1884-12-31).
Decreed rights (6)
| 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 |
|---|---|---|---|---|---|---|---|
| 12646.0 | 1884-08-15 | 1906-08-11 | 0.0 | 0.0 | C | IRRAUG | 13 |
| 13778.0 | 1887-09-21 | 1906-08-11 | 0.0 | 0.0 | C | IRRAUG | 31 |
| 22494.22423 | 1911-05-24 | 1915-03-20 | 4.0 | 0.0 | C | IRR | 122 |
| 31393.23162 | 1913-06-01 | 1938-07-13 | 0.0 | 0.0 | C | IRRAUG | 150 |
| 31393.25672 | 1920-04-15 | 1938-07-13 | 0.0 | 0.0 | C | IRRAUG | 153 |
| 49451.0 | 1985-05-23 | 1985-12-31 | 14.0 | 0.0 | C | IRR |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 1,469 AF. Its most recent year on record, 2024, came in at 1,469 AF — 100% of that, and 8th 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 | 259 | 5th lowest of 15 · 18% of median | 52 | 3.2 |
| 2011 | 90 | 2nd lowest of 15 · 6% of median | 92 | 0.6 |
| 2012 | 106 | 3rd lowest of 15 · 7% of median | 50 | 1.3 |
| 2013 | 57 | 1st lowest of 15 · 4% of median | 23 | 1.3 |
| 2014 | 477 | 6th lowest of 15 · 32% of median | 55 | 20.0 |
| 2015 | 242 | 4th lowest of 15 · 16% of median | 99 | 2.4 |
| 2016 | 1,795 | 9th lowest of 15 · 122% of median | 74 | 24.5 |
| 2017 | 2,967 | 14th lowest of 15 · 202% of median | 91 | 26.0 |
| 2018 | 2,493 | 13th lowest of 15 · 170% of median | 71 | 27.0 |
| 2019 | 2,472 | 12th lowest of 15 · 168% of median | 129 | 25.0 |
| 2020 | 3,180 | 15th lowest of 15 · 216% of median | 80 | 30.0 |
| 2021 | 1,453 | 7th lowest of 15 · 99% of median | 43 | 21.3 |
| 2022 | 2,383 | 11th lowest of 15 · 162% of median | 76 | 23.0 |
| 2023 | 1,954 | 10th lowest of 15 · 133% of median | 77 | 22.6 |
| 2024 | 1,469 | 8th lowest of 15 · 100% of median | 54 | 16.5 |
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.