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MASON DITCH
Structure dossier · WDID 4700759 · 1 · SOUTH FORK MICHIGAN RIVE · DWR record
Where this page's figures come from
Generated 2026-08-27 23:52 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 1910-09-07 — 459th most senior of the 1262 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: SUNRISE DITCH (1909-10-10). Immediately behind: MACFARLANE RES (1910-10-20).
Decreed rights (2)
| 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 |
|---|---|---|---|---|---|---|---|
| 22164.0 | 1910-09-07 | 1913-01-06 | 28.0 | 0.0 | C | IRRSTK | 362 |
| 50403.28016 | 1926-09-15 | 1988-12-31 | 5.0 | 0.0 | C | STK |
Legal record & documents
4 decreed actions on record across
4 court cases:
88CW0187, CA3571, CA2891, 84CW0071.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
88CW0187 | 1 | 1988-12-31 | S |
CA3571 | 1 | 1913-01-06 | S |
CA2891 | 1 | 1913-01-06 | S |
84CW0071 | 1 | 1913-01-06 | 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 1,547 AF. Its most recent year on record, 2025, came in at 352 AF — 23% of that, and 1st 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 | 909 | 4th lowest of 15 · 59% of median | 39 | 17.0 |
| 2012 | 407 | 3rd lowest of 15 · 26% of median | 83 | 12.1 |
| 2013 | 2,400 | 14th lowest of 15 · 155% of median | 136 | 19.8 |
| 2014 | 1,675 | 9th lowest of 15 · 108% of median | 146 | 15.2 |
| 2015 | 1,502 | 7th lowest of 15 · 97% of median | 176 | 13.1 |
| 2016 | 2,596 | 15th lowest of 15 · 168% of median | 163 | 11.2 |
| 2017 | 1,851 | 11th lowest of 15 · 120% of median | 127 | 11.3 |
| 2018 | 1,547 | 8th lowest of 15 · 100% of median | 104 | 33.6 |
| 2019 | 1,495 | 6th lowest of 15 · 97% of median | 88 | 13.6 |
| 2020 | 1,260 | 5th lowest of 15 · 81% of median | 92 | 12.4 |
| 2021 | 389 | 2nd lowest of 15 · 25% of median | 58 | 8.0 |
| 2022 | 2,135 | 12th lowest of 15 · 138% of median | 60 | 21.1 |
| 2023 | 1,748 | 10th lowest of 15 · 113% of median | 53 | 19.1 |
| 2024 | 2,314 | 13th lowest of 15 · 150% of median | 118 | 20.0 |
| 2025 | 352 | 1st lowest of 15 · 23% of median | 48 | 10.0 |
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 | 2 right(s), seniority decoded |
| diversion record | present | 4554 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | sparse | 30% of the irrigation seasons in 1954-2025 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.