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GRAY ROCK SPRING NO 1
Structure dossier · WDID 3705285 · 4 · BRUSH CREEK · DWR record
Where this page's figures come from
Generated 2026-08-28 02:11 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 1940-12-31 — 1407th most senior of the 2162 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: EAGLE PARK WETLANDS/HOMESTAKE EXCHANG (1988-12-19). Immediately behind: VERNON RESERVOIR (1985-06-01).
Decreed rights (2)
| 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 |
|---|---|---|---|---|---|---|---|
| 50769.33237 | 1940-12-31 | 1989-12-31 | 0.033 | 0.0 | C | DOM | |
| 51117.0 | 1989-12-14 | 1989-12-31 | 0.067 | 0.0 | C | IRRCOMINDRECFIRSTKSNOOTH |
Legal record & documents
4 decreed actions on record across
3 court cases:
89CW0306, 14CW3061, 07CW0025.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
89CW0306 | 2 | 1989-12-31 | S |
14CW3061 | 1 | 1989-12-31 | S |
07CW0025 | 1 | 1989-12-31 | 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 9 years on record)
In a median year this structure has a recorded diversion of 12 AF. Its most recent year on record, 2023, came in at 1 AF — 8% of that, and 1st lowest of the 9 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) |
|---|---|---|---|---|
| 2010 | 9 | 4th lowest of 9 · 75% of median | 153 | 0.0 |
| 2011 | 60 | 9th lowest of 9 · 500% of median | 189 | 0.2 |
| 2014 | 21 | 8th lowest of 9 · 175% of median | 184 | 0.1 |
| 2016 | 12 | 5th lowest of 9 · 100% of median | 211 | 0.1 |
| 2017 | 12 | 5th lowest of 9 · 100% of median | 211 | 0.1 |
| 2018 | 12 | 5th lowest of 9 · 100% of median | 211 | 0.1 |
| 2020 | 1 | 1st lowest of 9 · 8% of median | 214 | 0.0 |
| 2022 | 1 | 1st lowest of 9 · 8% of median | 215 | 0.0 |
| 2023 | 1 | 1st lowest of 9 · 8% of median | 184 | 0.0 |
Trends for this structure
Recorded use is falling over its last 9 recorded years (-2 AF/yr, Mann-Kendall p=0.039).
How good is our record of it?
Grade B (8/10 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 | 2 right(s), seniority decoded |
| diversion record | present | 1772 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | patchy | 62% of the irrigation seasons in 2010-2023 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.