Hydrohistorian
← My Water · Print / save as PDF
GRASS VALLEY CANAL
Structure dossier · WDID 3900563 · 1 · EAST RIFLE CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 22:45 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 1887-07-20 — 118th most senior of the 1758 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: OAK GROVE DITCH (1890-02-20). Immediately behind: NOTT NO 1 DITCH (1890-09-29).
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 |
|---|---|---|---|---|---|---|---|
| 15458.13715 | 1887-07-20 | 1892-04-30 | 100.0 | 0.0 | C | IRRAUG | 119A |
| 37503.15066 | 1891-04-01 | 1966-11-10 | 24.0 | 0.0 | C | DOMSTK | 269, 270 |
Legal record & documents
5 decreed actions on record across
3 court cases:
CA4914, CA0279, 00CW0036.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
CA4914 | 2 | 1966-11-10 | S |
CA0279 | 1 | 1892-04-30 | S |
00CW0036 | 2 | 1892-04-30 | 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 15 years on record)
In a median year this structure has a recorded diversion of 8,297 AF. Its most recent year on record, 2024, came in at 8,297 AF — 100% of that, and 8th 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) |
|---|---|---|---|---|
| 2010 | 11,689 | 14th lowest of 15 · 141% of median | 365 | 46.4 |
| 2011 | 13,077 | 15th lowest of 15 · 158% of median | 365 | 52.5 |
| 2012 | 10,553 | 13th lowest of 15 · 127% of median | 366 | 39.1 |
| 2013 | 5,578 | 3rd lowest of 15 · 67% of median | 365 | 37.3 |
| 2014 | 6,635 | 6th lowest of 15 · 80% of median | 365 | 34.2 |
| 2015 | 7,802 | 7th lowest of 15 · 94% of median | 365 | 33.0 |
| 2016 | 9,081 | 10th lowest of 15 · 109% of median | 366 | 44.6 |
| 2017 | 8,678 | 9th lowest of 15 · 105% of median | 365 | 40.6 |
| 2018 | 5,033 | 2nd lowest of 15 · 61% of median | 365 | 25.7 |
| 2019 | 6,240 | 5th lowest of 15 · 75% of median | 365 | 37.9 |
| 2020 | 9,162 | 11th lowest of 15 · 110% of median | 366 | 31.4 |
| 2021 | 5,970 | 4th lowest of 15 · 72% of median | 365 | 29.0 |
| 2022 | 2,878 | 1st lowest of 15 · 35% of median | 365 | 21.4 |
| 2023 | 10,001 | 12th lowest of 15 · 120% of median | 365 | 44.3 |
| 2024 | 8,297 | 8th lowest of 15 · 100% of median | 305 | 35.7 |
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 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 | 2 right(s), seniority decoded |
| diversion record | present | 15436 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | continuous | 96% of the irrigation seasons in 1949-2024 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.