Hydrohistorian
← My Water · Print / save as PDF
WILLOW RUN DITCH
Structure dossier · WDID 5900707 · 1 · CARBON CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 23:11 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 1884-07-31 — 106th most senior of the 2360 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: SQUIRREL CREEK NO2 DITCH (1884-06-03). Immediately behind: MARSHALL NO 1 DITCH (1884-08-31).
Decreed rights (3)
| 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 |
|---|---|---|---|---|---|---|---|
| 12631.0 | 1884-07-31 | 1906-09-14 | 2.75 | 0.0 | C | IRR | 50 |
| 20710.12631 | 1884-07-31 | 1921-10-25 | 2.5 | 0.0 | C | IRR | 183 |
| 30667.12631 | 1884-07-31 | 1941-04-29 | 7.75 | 0.0 | C | IRR | 315, 324 |
Legal record & documents
4 decreed actions on record across
4 court cases:
CA2021, 92CW0079, CA1635, CA1325.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
CA2021 | 1 | 1941-04-29 | S |
92CW0079 | 1 | 1941-04-29 | S |
CA1635 | 1 | 1921-10-25 | S |
CA1325 | 1 | 1906-09-14 | 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 736 AF. Its most recent year on record, 2025, came in at 546 AF — 74% of that, and 7th 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) |
|---|---|---|---|---|
| 2011 | 2,499 | 15th lowest of 15 · 340% of median | 119 | 18.5 |
| 2012 | 7 | 1st lowest of 15 · 1% of median | 48 | 0.1 |
| 2013 | 481 | 6th lowest of 15 · 65% of median | 61 | 7.0 |
| 2014 | 736 | 8th lowest of 15 · 100% of median | 59 | 7.3 |
| 2015 | 299 | 4th lowest of 15 · 41% of median | 36 | 4.7 |
| 2016 | 901 | 11th lowest of 15 · 122% of median | 68 | 9.8 |
| 2017 | 742 | 9th lowest of 15 · 101% of median | 60 | 6.6 |
| 2018 | 298 | 3rd lowest of 15 · 40% of median | 66 | 6.1 |
| 2019 | 988 | 12th lowest of 15 · 134% of median | 71 | 10.5 |
| 2020 | 313 | 5th lowest of 15 · 42% of median | 59 | 5.4 |
| 2021 | 100 | 2nd lowest of 15 · 14% of median | 32 | 2.0 |
| 2022 | 757 | 10th lowest of 15 · 103% of median | 62 | 9.8 |
| 2023 | 1,364 | 13th lowest of 15 · 185% of median | 66 | 12.0 |
| 2024 | 1,439 | 14th lowest of 15 · 196% of median | 96 | 13.3 |
| 2025 | 546 | 7th lowest of 15 · 74% of median | 68 | 5.7 |
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 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 | 3 right(s), seniority decoded |
| diversion record | present | 3262 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | sparse | 30% of the irrigation seasons in 1975-2025 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.