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HARRISON NO 1 DITCH
Structure dossier · WDID 6800597 · 1 · DALLAS CREEK · DWR record
Where this page's figures come from
Generated 2026-08-28 03:02 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 1900-07-20 — 328th most senior of the 1293 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: LONE PINE DITCH (1897-08-06). Immediately behind: HARRISON NO 2 DITCH (1900-07-20).
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 |
|---|---|---|---|---|---|---|---|
| 40646.18463 | 1900-07-20 | 1971-09-13 | 4.5 | 0.0 | C | IRRDOMSTK | 2, 3 |
Legal record & documents
2 decreed actions on record across
1 court case:
CA2710.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
CA2710 | 2 | 1971-09-13 | 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 179 AF. Its most recent year on record, 2025, came in at 736 AF — 411% of that, and 15th 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 | 292 | 11th lowest of 15 · 163% of median | 70 | 4.6 |
| 2012 | 98 | 4th lowest of 15 · 55% of median | 28 | 3.0 |
| 2013 | 0 | 1st lowest of 15 · 0% of median | 5 | 0.0 |
| 2014 | 131 | 5th lowest of 15 · 73% of median | 38 | 2.5 |
| 2015 | 179 | 7th lowest of 15 · 100% of median | 130 | 2.3 |
| 2016 | 202 | 9th lowest of 15 · 113% of median | 76 | 2.5 |
| 2017 | 390 | 12th lowest of 15 · 218% of median | 63 | 4.2 |
| 2018 | 21 | 2nd lowest of 15 · 12% of median | 14 | 2.3 |
| 2019 | 179 | 7th lowest of 15 · 100% of median | 64 | 3.0 |
| 2020 | 55 | 3rd lowest of 15 · 31% of median | 41 | 2.8 |
| 2021 | 224 | 10th lowest of 15 · 125% of median | 68 | 3.1 |
| 2022 | 172 | 6th lowest of 15 · 96% of median | 70 | 2.6 |
| 2023 | 597 | 14th lowest of 15 · 334% of median | 72 | 9.3 |
| 2024 | 398 | 13th lowest of 15 · 222% of median | 89 | 3.4 |
| 2025 | 736 | 15th lowest of 15 · 411% of median | 183 | 4.1 |
Trends for this structure
Recorded use is rising over its last 15 recorded years (+25 AF/yr, Mann-Kendall p=0.042).
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 | 2047 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | sparse | 26% of the irrigation seasons in 1989-2025 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.