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DORN DITCH
Structure dossier · WDID 1900594 · 1 · SOUTH FORK PURGATOIRE RI · DWR record
Where this page's figures come from
Generated 2026-08-27 23:39 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 1866-04-01 — 38th most senior of the 735 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: HILL RANCH AUG PLAN (1866-03-01). Immediately behind: MAXWELL DITCH NO 20 (1866-05-30).
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 |
|---|---|---|---|---|---|---|---|
| 5935.0 | 1866-04-01 | 1903-08-10 | 2.4 | 0.0 | C | IRRRECFISFIRSTKAUGWLD | 25 |
Legal record & documents
3 decreed actions on record across
2 court cases:
08CW0103, 08/10/1903.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
08CW0103 | 2 | 1903-08-10 | O |
08/10/1903 | 1 | 1903-08-10 | 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 211 AF. Its most recent year on record, 2024, came in at 235 AF — 111% of that, and 11th 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 | 258 | 14th lowest of 15 · 122% of median | 66 | 2.4 |
| 2011 | 84 | 3rd lowest of 15 · 40% of median | 34 | 2.4 |
| 2012 | 88 | 4th lowest of 15 · 42% of median | 28 | 2.4 |
| 2013 | 71 | 2nd lowest of 15 · 34% of median | 43 | 2.3 |
| 2014 | 211 | 8th lowest of 15 · 100% of median | 72 | 2.3 |
| 2015 | 234 | 10th lowest of 15 · 111% of median | 79 | 2.4 |
| 2016 | 226 | 9th lowest of 15 · 107% of median | 73 | 2.4 |
| 2017 | 249 | 13th lowest of 15 · 118% of median | 79 | 2.4 |
| 2018 | 0 | 1st lowest of 15 · 0% of median | 23 | 0.0 |
| 2019 | 236 | 12th lowest of 15 · 112% of median | 68 | 2.4 |
| 2020 | 172 | 6th lowest of 15 · 82% of median | 75 | 2.3 |
| 2021 | 181 | 7th lowest of 15 · 86% of median | 63 | 2.2 |
| 2022 | 170 | 5th lowest of 15 · 81% of median | 61 | 2.2 |
| 2023 | 382 | 15th lowest of 15 · 181% of median | 105 | 2.7 |
| 2024 | 235 | 11th lowest of 15 · 111% of median | 56 | 2.6 |
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 | 4599 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | sparse | 24% of the irrigation seasons in 1936-2024 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.