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ANNA ROZMAN DITCH
Structure dossier · WDID 5900510 · 1 · SLATE RIVER · DWR record
Where this page's figures come from
Generated 2026-08-27 22:48 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 1927-06-01 — 624th 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: VERZUH DITCH (1925-06-01). Immediately behind: VERZUH YOUNG BIFANO D (1927-06-01).
Decreed rights (4)
| 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 |
|---|---|---|---|---|---|---|---|
| 28733.28275 | 1927-06-01 | 1931-07-06 | 1.75 | 0.0 | C | IRR | 269 |
| 30667.22461 | 1911-07-01 | 1941-04-29 | 3.5 | 0.0 | C | IRRAUG | 421 |
| 30667.28275 | 1927-06-01 | 1941-04-29 | 6.25 | 0.0 | C | IRR | 459 |
| 44925.22461 | 1911-07-01 | 1973-12-31 | 3.5 | 0.0 | C | IRR |
Legal record & documents
6 decreed actions on record across
4 court cases:
81CW0294, CA5638, CA2021, 82CW0038.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
81CW0294 | 1 | 1973-12-31 | S |
CA5638 | 2 | 1941-04-29 | S |
CA2021 | 1 | 1941-04-29 | S |
82CW0038 | 2 | 1941-04-29 | 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 838 AF. Its most recent year on record, 2025, came in at 639 AF — 76% of that, and 4th 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 | 1,982 | 12th lowest of 15 · 236% of median | 111 | 13.3 |
| 2012 | 2,061 | 13th lowest of 15 · 246% of median | 127 | 11.8 |
| 2013 | 1,553 | 11th lowest of 15 · 185% of median | 79 | 12.6 |
| 2014 | 2,180 | 14th lowest of 15 · 260% of median | 96 | 13.1 |
| 2015 | 1,092 | 10th lowest of 15 · 130% of median | 84 | 10.0 |
| 2016 | 447 | 1st lowest of 15 · 53% of median | 76 | 3.4 |
| 2017 | 609 | 3rd lowest of 15 · 73% of median | 45 | 7.7 |
| 2018 | 819 | 7th lowest of 15 · 98% of median | 86 | 5.7 |
| 2019 | 838 | 8th lowest of 15 · 100% of median | 39 | 15.1 |
| 2020 | 804 | 6th lowest of 15 · 96% of median | 59 | 8.5 |
| 2021 | 471 | 2nd lowest of 15 · 56% of median | 67 | 5.7 |
| 2022 | 703 | 5th lowest of 15 · 84% of median | 125 | 8.5 |
| 2023 | 3,011 | 15th lowest of 15 · 359% of median | 163 | 11.6 |
| 2024 | 978 | 9th lowest of 15 · 117% of median | 90 | 6.1 |
| 2025 | 639 | 4th lowest of 15 · 76% of median | 40 | 8.5 |
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 | 4 right(s), seniority decoded |
| diversion record | present | 4837 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | patchy | 45% 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.