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HEAD AND CORTAY NO 4 D
Structure dossier · WDID 2800583 · 1 · TOMICHI CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 23:37 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 1876-05-15 — 33rd most senior of the 1505 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: CHEENEY NO 1 DITCH (1876-05-15). Immediately behind: PARLIN NO 1 DITCH (1876-06-01).
Decreed rights (6)
| 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 |
|---|---|---|---|---|---|---|---|
| 16192.09632 | 1876-05-15 | 1904-04-29 | 0.4 | 0.0 | C | IRR | |
| 16192.11475 | 1881-06-01 | 1904-04-29 | 0.8 | 0.0 | C | IRR | |
| 16192.12875 | 1885-04-01 | 1904-04-29 | 0.48 | 0.0 | C | IRR | 78 |
| 28311.09632 | 1876-05-15 | 1943-04-19 | 1.6 | 0.0 | C | IRR | |
| 28311.11475 | 1881-06-01 | 1943-04-19 | 3.2 | 0.0 | C | IRR | |
| 28311.12875 | 1885-04-01 | 1943-04-19 | 1.92 | 0.0 | C | IRR | 242 |
Legal record & documents
6 decreed actions on record across
3 court cases:
W3413, CA2079, CA1266.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
W3413 | 4 | 1943-04-19 | S |
CA2079 | 1 | 1943-04-19 | S |
CA1266 | 1 | 1904-04-29 | 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 92 AF. Its most recent year on record, 2025, came in at 0 AF — 0% 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) |
|---|---|---|---|---|
| 1997 | 1,027 | 14th lowest of 15 · 1116% of median | 70 | 8.0 |
| 1998 | 1,044 | 15th lowest of 15 · 1135% of median | 117 | 4.5 |
| 1999 | 710 | 12th lowest of 15 · 772% of median | 83 | 8.0 |
| 2001 | 0 | 1st lowest of 15 · 0% of median | 6 | 0.0 |
| 2004 | 92 | 8th lowest of 15 · 100% of median | 45 | 1.2 |
| 2008 | 317 | 11th lowest of 15 · 345% of median | 71 | 3.0 |
| 2011 | 0 | 1st lowest of 15 · 0% of median | 2 | 0.0 |
| 2012 | 0 | 1st lowest of 15 · 0% of median | 10 | 0.0 |
| 2016 | 976 | 13th lowest of 15 · 1061% of median | 125 | 4.0 |
| 2017 | 12 | 7th lowest of 15 · 13% of median | 29 | 0.3 |
| 2018 | 183 | 10th lowest of 15 · 199% of median | 109 | 1.9 |
| 2019 | 182 | 9th lowest of 15 · 198% of median | 93 | 1.0 |
| 2022 | 0 | 1st lowest of 15 · 0% of median | 1 | 0.0 |
| 2024 | 0 | 1st lowest of 15 · 0% of median | 1 | 0.0 |
| 2025 | 0 | 1st lowest of 15 · 0% of median | 1 | 0.0 |
Trends for this structure
Recorded use is falling over its last 15 recorded years (-19 AF/yr, Mann-Kendall p=0.027).
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 | 6 right(s), seniority decoded |
| diversion record | present | 2926 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | sparse | 27% of the irrigation seasons in 1974-2025 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.