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MARY DITCH
Structure dossier · WDID 3600725 · 1 · BLACK CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 23:48 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 1903-06-15 — 203rd most senior of the 1247 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: MAT NO 2 DITCH (1903-06-02). Immediately behind: COLUMBINE DITCH (1903-07-08).
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 |
|---|---|---|---|---|---|---|---|
| 19523.0 | 1903-06-15 | 1910-03-02 | 1.0 | 0.0 | C | IRR | 145 |
| 32075.2283 | 1912-07-04 | 1952-03-10 | 4.8 | 0.0 | C | IRRDOMSTKPWR | 115, 311 |
| 37421.0 | 1952-06-15 | 1972-05-31 | 2.2 | 0.0 | C | IRR |
Legal record & documents
5 decreed actions on record across
4 court cases:
CA2371, CA1806, CA1805, CA1277.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
CA2371 | 1 | 1972-05-31 | S |
CA1806 | 2 | 1952-03-10 | S |
CA1805 | 1 | 1952-03-10 | S |
CA1277 | 1 | 1910-03-02 | 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 266 AF. Its most recent year on record, 2024, came in at 70 AF — 26% 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) |
|---|---|---|---|---|
| 2007 | 266 | 8th lowest of 15 · 100% of median | 43 | 10.6 |
| 2008 | 335 | 10th lowest of 15 · 126% of median | 48 | 6.8 |
| 2009 | 278 | 9th lowest of 15 · 104% of median | 39 | 5.7 |
| 2010 | 431 | 12th lowest of 15 · 162% of median | 71 | 8.0 |
| 2011 | 712 | 14th lowest of 15 · 268% of median | 76 | 8.0 |
| 2012 | 355 | 11th lowest of 15 · 134% of median | 66 | 5.7 |
| 2016 | 838 | 15th lowest of 15 · 315% of median | 77 | 5.6 |
| 2017 | 175 | 7th lowest of 15 · 66% of median | 80 | 2.3 |
| 2018 | 66 | 3rd lowest of 15 · 25% of median | 59 | 1.0 |
| 2019 | 520 | 13th lowest of 15 · 196% of median | 82 | 8.0 |
| 2020 | 114 | 6th lowest of 15 · 43% of median | 56 | 2.7 |
| 2021 | 84 | 5th lowest of 15 · 32% of median | 50 | 2.7 |
| 2022 | 31 | 1st lowest of 15 · 12% of median | 65 | 0.4 |
| 2023 | 59 | 2nd lowest of 15 · 22% of median | 56 | 1.5 |
| 2024 | 70 | 4th lowest of 15 · 26% of median | 35 | 2.5 |
Trends for this structure
Recorded use is falling over its last 15 recorded years (-18 AF/yr, Mann-Kendall p=0.038).
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 | 3974 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | sparse | 32% of the irrigation seasons in 1966-2024 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.