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WILLOWDALE DITCH
Structure dossier · WDID 1100684 · 1 · CHALK CREEK · DWR record
Where this page's figures come from
Generated 2026-08-28 00:39 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 1867-05-31 — 50th most senior of the 1489 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: PIKE DITCH (1867-05-31). Immediately behind: UPPER MILL DITCH (1867-05-31).
Decreed rights (9)
| 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 |
|---|---|---|---|---|---|---|---|
| 6360.0 | 1867-05-31 | 1890-06-19 | 0.0 | 0.0 | C | IRR | 18 |
| 11412.0 | 1881-03-30 | 1890-06-19 | 3.3 | 0.0 | C | STOIRRMUNCOMINDRECFISFIRDOMAUG | 84 |
| 13119.0 | 1885-12-01 | 1890-06-19 | 2.54 | 0.0 | C | STOIRRMUNCOMINDRECFISFIRDOMAUG | 147 |
| 13710.0 | 1887-07-15 | 1904-07-12 | 6.0333 | 0.0 | C | STOIRRMUNCOMINDRECFISFIRDOMAUG | |
| 14147.0 | 1888-09-24 | 1890-06-19 | 6.36 | 0.0 | C | STOIRRMUNCOMINDRECFISFIRDOMAUG | 173 |
| 14305.0 | 1889-03-01 | 1890-06-19 | 0.0 | 0.0 | C | IRR | 176 |
| 17358.15462 | 1892-05-01 | 1907-07-13 | 3.2 | 0.0 | C | STOIRRMUNCOMINDRECFIRDOMAUG | |
| 22407.21014 | 1907-07-15 | 1911-06-09 | 2.0 | 0.0 | C | STOIRRMUNCOMINDRECFISFIRDOMAUG | |
| 28435.11412 | 1881-03-30 | 1932-01-18 | 1.5 | 0.0 | C | STOIRRMUNCOMINDRECFISFIRDOMSTK | NI |
Legal record & documents
28 decreed actions on record across
8 court cases:
CA3053, 01CW0152, 80CW0004, W4800, CA4761, CA4075, CA3824, CA1127.
Every case, dated
| Case | Actions | Latest adjudication | Types |
|---|---|---|---|
CA3053 | 1 | 1932-01-18 | S |
01CW0152 | 15 | 1932-01-18 | O, S |
80CW0004 | 7 | 1911-06-09 | O, S |
W4800 | 1 | 1890-06-19 | O |
CA4761 | 1 | 1890-06-19 | O |
CA4075 | 1 | 1890-06-19 | O |
CA3824 | 1 | 1890-06-19 | O |
CA1127 | 1 | 1890-06-19 | 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 1,812 AF. Its most recent year on record, 2023, came in at 1,502 AF — 83% of that, and 7th 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) |
|---|---|---|---|---|
| 2009 | 0 | 1st lowest of 15 · 0% of median | 306 | 0.0 |
| 2010 | 0 | 1st lowest of 15 · 0% of median | 12 | 0.0 |
| 2011 | 2,060 | 10th lowest of 15 · 114% of median | 126 | 13.8 |
| 2012 | 1,353 | 3rd lowest of 15 · 75% of median | 157 | 9.8 |
| 2013 | 1,461 | 6th lowest of 15 · 81% of median | 111 | 10.7 |
| 2014 | 1,353 | 3rd lowest of 15 · 75% of median | 99 | 16.6 |
| 2015 | 2,324 | 13th lowest of 15 · 128% of median | 156 | 15.0 |
| 2016 | 2,243 | 11th lowest of 15 · 124% of median | 152 | 16.1 |
| 2017 | 3,002 | 15th lowest of 15 · 166% of median | 171 | 28.0 |
| 2018 | 1,812 | 8th lowest of 15 · 100% of median | 168 | 14.2 |
| 2019 | 1,446 | 5th lowest of 15 · 80% of median | 176 | 13.5 |
| 2020 | 1,955 | 9th lowest of 15 · 108% of median | 214 | 11.0 |
| 2021 | 2,810 | 14th lowest of 15 · 155% of median | 225 | 10.8 |
| 2022 | 2,281 | 12th lowest of 15 · 126% of median | 365 | 10.9 |
| 2023 | 1,502 | 7th lowest of 15 · 83% of median | 304 | 13.7 |
Trends for this structure
Recorded use is rising over its last 15 recorded years (+100 AF/yr, Mann-Kendall p=0.047).
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 | 9 right(s), seniority decoded |
| diversion record | present | 11413 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | patchy | 48% of the irrigation seasons in 1912-2023 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.