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ISLAND DITCH
Structure dossier · WDID 0500561 · 1 · SAINT VRAIN CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 23:10 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
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 1864-06-15 — 73rd most senior of the 1289 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: COFFMAN DITCH (1864-05-30). Immediately behind: ST VRAIN CREEK (1865-05-01).
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 |
|---|---|---|---|---|---|---|---|
| 5280.0 | 1864-06-15 | 1882-06-02 | 4.52 | 0.0 | C | IRR |
Legal record & documents
1 decreed actions on record across
1 court case:
CA1319.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
CA1319 | 1 | 1882-06-02 | O |
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 15 years on record)
In a median year this structure has a recorded diversion of 127 AF. Its most recent year on record, 2016, came in at 137 AF — 108% of that, and 10th 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) |
|---|---|---|---|---|
| 1978 | 0 | 1st lowest of 15 · 0% of median | 14 | 0.0 |
| 1979 | 0 | 1st lowest of 15 · 0% of median | 14 | 0.0 |
| 1980 | 130 | 9th lowest of 15 · 102% of median | 79 | 5.0 |
| 1981 | 397 | 13th lowest of 15 · 313% of median | 153 | 4.5 |
| 1982 | 24 | 3rd lowest of 15 · 19% of median | 76 | 3.0 |
| 1983 | 100 | 7th lowest of 15 · 79% of median | 39 | 4.5 |
| 1984 | 127 | 8th lowest of 15 · 100% of median | 37 | 3.0 |
| 1985 | 60 | 5th lowest of 15 · 47% of median | 7 | 5.0 |
| 1986 | 254 | 12th lowest of 15 · 200% of median | 54 | 4.0 |
| 1987 | 67 | 6th lowest of 15 · 53% of median | 22 | 4.0 |
| 1988 | 52 | 4th lowest of 15 · 41% of median | 15 | 2.0 |
| 2011 | 459 | 15th lowest of 15 · 361% of median | 131 | 7.2 |
| 2014 | 239 | 11th lowest of 15 · 188% of median | 205 | 3.3 |
| 2015 | 437 | 14th lowest of 15 · 344% of median | 214 | 4.0 |
| 2016 | 137 | 10th lowest of 15 · 108% of median | 214 | 3.1 |
Trends for this structure
Recorded use shows no clear trend over its last 15 recorded years — which is itself worth knowing.
How good is our record of it?
Grade B (7/10 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 | 3080 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | sparse | 22% of the irrigation seasons in 1950-2016 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.