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AT LAST SPG NO 1 W SIDE
Structure dossier · WDID 2900506 · 4 · WEST FORK SAN JUAN RIVER · DWR record
Where this page's figures come from
Generated 2026-08-27 20:45 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.
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 1966-08-01 — 357th 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: ALLEN CREEK DITCH (1966-07-10). Immediately behind: AT LAST SPG NO 2 W SIDE (1966-08-01).
Decreed rights (1)
| 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 |
|---|---|---|---|---|---|---|---|
| 42581.0 | 1966-08-01 | 1968-12-19 | 3.7 | 0.0 | C | IRRDOMSTK | 68-241 |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 40 AF. Its most recent year on record, 1989, came in at 2 AF — 5% of that, and 4th 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) |
|---|---|---|---|---|
| 1974 | 226 | 13th lowest of 15 · 565% of median | 63 | 3.0 |
| 1975 | 288 | 14th lowest of 15 · 720% of median | 65 | 3.0 |
| 1976 | 379 | 15th lowest of 15 · 948% of median | 84 | 4.0 |
| 1977 | 46 | 10th lowest of 15 · 115% of median | 51 | 1.0 |
| 1978 | 98 | 11th lowest of 15 · 245% of median | 90 | 1.0 |
| 1979 | 39 | 7th lowest of 15 · 98% of median | 59 | 1.0 |
| 1980 | 113 | 12th lowest of 15 · 282% of median | 66 | 2.0 |
| 1981 | 40 | 8th lowest of 15 · 100% of median | 78 | 1.1 |
| 1982 | 44 | 9th lowest of 15 · 110% of median | 69 | 1.0 |
| 1983 | 0 | 1st lowest of 15 · 0% of median | 5 | 0.0 |
| 1984 | 0 | 1st lowest of 15 · 0% of median | 1 | 0.0 |
| 1985 | 0 | 1st lowest of 15 · 0% of median | 27 | 0.0 |
| 1986 | 10 | 5th lowest of 15 · 25% of median | 51 | 0.2 |
| 1987 | 12 | 6th lowest of 15 · 30% of median | 45 | 0.2 |
| 1989 | 2 | 4th lowest of 15 · 5% of median | 23 | 0.1 |
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.