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ISGAR IRRIGATION SYSTEM
Structure dossier · WDID 3300616 · 1 · LA PLATA RIVER · DWR record
Where this page's figures come from
Generated 2026-08-27 22:46 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (f6d7fdc) — 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 1925-12-31 — 260th most senior of the 364 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: BOGLE NO 1 WELL (1973-09-10). Immediately behind: SHALAKO WELL NO 3 (1942-12-31).
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 |
|---|---|---|---|---|---|---|---|
| 45290.27758 | 1925-12-31 | 1974-12-31 | 3.0 | 0.0 | C | IRRFIS |
Legal record & documents
3 decreed actions on record across
1 court case:
W1237.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
W1237 | 3 | 1974-12-31 | S |
DWR's own records for this structure: net amounts · transactions & adjudication history · scanned decrees (search a case number there for the imaged document). On this site: the district's full legal picture →
Recorded use (last 11 years on record)
In a median year this structure has a recorded diversion of 342 AF. Its most recent year on record, 1985, came in at 366 AF — 107% of that, and 7th lowest of the 11 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) |
|---|---|---|---|---|
| 1975 | 462 | 11th lowest of 11 · 135% of median | 195 | 2.6 |
| 1976 | 280 | 3rd lowest of 11 · 82% of median | 210 | 2.2 |
| 1977 | 46 | 1st lowest of 11 · 14% of median | 209 | 0.2 |
| 1978 | 203 | 2nd lowest of 11 · 59% of median | 176 | 1.9 |
| 1979 | 396 | 9th lowest of 11 · 116% of median | 170 | 3.1 |
| 1980 | 381 | 8th lowest of 11 · 111% of median | 130 | 2.5 |
| 1981 | 312 | 4th lowest of 11 · 91% of median | 146 | 2.4 |
| 1982 | 330 | 5th lowest of 11 · 96% of median | 160 | 1.5 |
| 1983 | 436 | 10th lowest of 11 · 128% of median | 146 | 2.2 |
| 1984 | 342 | 6th lowest of 11 · 100% of median | 159 | 1.5 |
| 1985 | 366 | 7th lowest of 11 · 107% of median | 151 | 1.5 |
Trends for this structure
Recorded use shows no clear trend over its last 11 recorded years — which is itself worth knowing.
How good is our record of it?
Grade A (9/10 points) — the components below are the finding; the letter alone is not.
The rubric, component by component
| Check | State | Detail |
|---|---|---|
| identity | complete | name, type, and water source all on file |
| decreed rights | on file | 1 right(s), seniority decoded |
| diversion record | present | 1852 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | continuous | 83% of the irrigation seasons in 1975-1985 carry measured days |
| published-record stability | stable | no upstream revisions recorded against this structure |
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.