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PURGATORY DITCH
Structure dossier · WDID 5300758 · 1 · BLACKTAIL CREEK · DWR record
Where this page's figures come from
Generated 2026-08-28 03:42 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (a1c9146) — 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 1905-09-01 — 172nd most senior of the 1231 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: HOUSER DITCH (1905-05-15). Immediately behind: FOUR CREEK DITCH HGT 1 (1906-07-26).
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 |
|---|---|---|---|---|---|---|---|
| 20427.20332 | 1905-09-01 | 1907-12-09 | 2.4 | 0.0 | C | IRR | 201 |
| 20427.20361 | 1905-09-30 | 1907-12-09 | 0.6 | 0.0 | C | IRR | 202 |
| 33023.20605 | 1906-06-01 | 1956-02-07 | 3.0 | 0.0 | C | IRR | 286 |
Legal record & documents
3 decreed actions on record across
2 court cases:
CA1123, CA0466.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
CA1123 | 1 | 1956-02-07 | S |
CA0466 | 2 | 1907-12-09 | 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 341 AF. Its most recent year on record, 2024, came in at 797 AF — 234% of that, and 12th 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) |
|---|---|---|---|---|
| 2007 | 684 | 10th lowest of 15 · 201% of median | 177 | 2.7 |
| 2008 | 103 | 2nd lowest of 15 · 30% of median | 43 | 1.2 |
| 2009 | 134 | 3rd lowest of 15 · 39% of median | 55 | 1.5 |
| 2010 | 171 | 5th lowest of 15 · 50% of median | 65 | 1.5 |
| 2011 | 341 | 8th lowest of 15 · 100% of median | 168 | 1.5 |
| 2012 | 162 | 4th lowest of 15 · 48% of median | 70 | 1.5 |
| 2014 | 302 | 7th lowest of 15 · 89% of median | 39 | 4.0 |
| 2015 | 577 | 9th lowest of 15 · 169% of median | 157 | 3.6 |
| 2016 | 825 | 13th lowest of 15 · 242% of median | 154 | 3.9 |
| 2017 | 863 | 15th lowest of 15 · 253% of median | 187 | 3.8 |
| 2018 | 825 | 13th lowest of 15 · 242% of median | 98 | 6.2 |
| 2019 | 0 | 1st lowest of 15 · 0% of median | 1 | 0.0 |
| 2020 | 245 | 6th lowest of 15 · 72% of median | 40 | 3.2 |
| 2023 | 696 | 11th lowest of 15 · 204% of median | 184 | 4.0 |
| 2024 | 797 | 12th lowest of 15 · 234% of median | 133 | 4.6 |
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 (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 | 3 right(s), seniority decoded |
| diversion record | present | 4408 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | patchy | 42% of the irrigation seasons in 1975-2024 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.