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RALSTON NO 1 DITCH
Structure dossier · WDID 3800953 · 1 · COULTER CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 19:54 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 in line
Priority 1884-10-01 — 138th most senior of the 4788 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: MILLER DITCH WOODY CR (1884-09-01). Immediately behind: BUCK FARM DITCH (1884-10-15).
Decreed rights (1)
| 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 |
|---|---|---|---|---|---|---|---|
| 12693.0 | 1884-10-01 | 1890-04-18 | 1.0 | 0.0 | C | STOIRRAUG | 104A |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 440 AF. Its most recent year on record, 2024, came in at 464 AF — 106% of that, and 11th 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) |
|---|---|---|---|---|
| 2010 | 624 | 15th lowest of 15 · 142% of median | 141 | 4.2 |
| 2011 | 446 | 9th lowest of 15 · 101% of median | 144 | 3.0 |
| 2012 | 385 | 5th lowest of 15 · 88% of median | 117 | 3.0 |
| 2013 | 264 | 2nd lowest of 15 · 60% of median | 113 | 2.3 |
| 2014 | 472 | 12th lowest of 15 · 107% of median | 153 | 3.0 |
| 2015 | 389 | 6th lowest of 15 · 88% of median | 110 | 2.0 |
| 2016 | 432 | 7th lowest of 15 · 98% of median | 137 | 2.0 |
| 2017 | 301 | 4th lowest of 15 · 68% of median | 101 | 2.0 |
| 2018 | 283 | 3rd lowest of 15 · 64% of median | 174 | 2.5 |
| 2019 | 532 | 14th lowest of 15 · 121% of median | 142 | 2.0 |
| 2020 | 453 | 10th lowest of 15 · 103% of median | 147 | 2.0 |
| 2021 | 212 | 1st lowest of 15 · 48% of median | 62 | 2.0 |
| 2022 | 440 | 8th lowest of 15 · 100% of median | 136 | 2.0 |
| 2023 | 496 | 13th lowest of 15 · 113% of median | 126 | 2.0 |
| 2024 | 464 | 11th lowest of 15 · 106% of median | 153 | 2.8 |
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.