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MASON DITCH
Structure dossier · WDID 7000566 · 1 · ROAN CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 19:51 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (a1c9146) — every figure regenerates from this named code version and data image.
Where it sits in line
Priority 1913-05-15 — 67th most senior of the 519 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: BAKER CANNON DITCH (1909-04-01). Immediately behind: FRANKLIN D AND LATERAL (1891-04-01).
Decreed rights (5)
| 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 |
|---|---|---|---|---|---|---|---|
| 23728.23145 | 1913-05-15 | 1915-07-17 | 1.1 | 0.0 | C | IRR | 156A |
| 23728.23187 | 1913-06-26 | 1915-07-17 | 1.3 | 0.0 | C | IRR | 156B |
| 24435.237 | 1914-11-21 | 1917-11-17 | 0.4 | 0.0 | C | IRR | 158 |
| 27132.23187 | 1913-06-26 | 1937-01-11 | 1.42 | 0.0 | C | IRR | 172 |
| 27132.27059 | 1924-02-01 | 1937-01-11 | 2.49 | 0.0 | C | IRR | 181B |
Recorded use (last 8 years on record)
In a median year this structure has a recorded diversion of 510 AF. Its most recent year on record, 1987, came in at 0 AF — 0% of that, and 1st lowest of the 8 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) |
|---|---|---|---|---|
| 1973 | 414 | 3rd lowest of 8 · 81% of median | 52 | 6.0 |
| 1975 | 908 | 7th lowest of 8 · 178% of median | 111 | 6.1 |
| 1976 | 489 | 4th lowest of 8 · 96% of median | 68 | 4.1 |
| 1978 | 532 | 5th lowest of 8 · 104% of median | 81 | 5.0 |
| 1979 | 922 | 8th lowest of 8 · 181% of median | 93 | 6.6 |
| 1980 | 894 | 6th lowest of 8 · 175% of median | 107 | 5.0 |
| 1982 | 86 | 2nd lowest of 8 · 17% of median | 30 | 1.5 |
| 1987 | 0 | 1st lowest of 8 · 0% of median | 1 | 0.0 |
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.