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MASCO-MASCO DITCH
Structure dossier · WDID 2900666 · 1 · SAN JUAN RIVER · DWR record
Where this page's figures come from
Generated 2026-08-27 21:24 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
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 1898-05-02 — 127th most senior of the 853 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: CABE DITCH (1897-10-20). Immediately behind: CARR DITCH (1899-05-20).
Decreed rights (4)
| 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 |
|---|---|---|---|---|---|---|---|
| 17654.0 | 1898-05-02 | 1903-01-23 | 1.33 | 0.0 | C | IRR | #104 |
| 19385.0 | 1903-01-28 | 1912-11-13 | 0.9 | 0.0 | C | IRR | #161 |
| 30832.0 | 1934-06-01 | 1962-04-19 | 1.75 | 0.0 | C | IRR | #301 |
| 55951.0 | 2003-03-10 | 2003-12-31 | 0.33 | 0.0 | C | IRRRECFISSTK |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 220 AF. Its most recent year on record, 2025, came in at 149 AF — 68% of that, and 2nd 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 | 314 | 12th lowest of 15 · 143% of median | 147 | 3.4 |
| 2012 | 303 | 10th lowest of 15 · 138% of median | 183 | 2.2 |
| 2013 | 335 | 13th lowest of 15 · 152% of median | 144 | 4.8 |
| 2014 | 447 | 15th lowest of 15 · 203% of median | 200 | 4.1 |
| 2015 | 309 | 11th lowest of 15 · 140% of median | 208 | 1.9 |
| 2016 | 220 | 8th lowest of 15 · 100% of median | 190 | 0.9 |
| 2017 | 182 | 6th lowest of 15 · 83% of median | 181 | 1.4 |
| 2018 | 166 | 5th lowest of 15 · 76% of median | 88 | 2.7 |
| 2019 | 122 | 1st lowest of 15 · 56% of median | 73 | 1.8 |
| 2020 | 208 | 7th lowest of 15 · 94% of median | 211 | 1.5 |
| 2021 | 298 | 9th lowest of 15 · 136% of median | 306 | 0.9 |
| 2022 | 163 | 4th lowest of 15 · 74% of median | 134 | 1.0 |
| 2023 | 149 | 2nd lowest of 15 · 68% of median | 138 | 1.0 |
| 2024 | 338 | 14th lowest of 15 · 154% of median | 151 | 2.0 |
| 2025 | 149 | 2nd lowest of 15 · 68% of median | 150 | 0.9 |
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.