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GROM DITCH
Structure dossier · WDID 5100687 · 1 · ROCK CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 19:52 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 1909-05-01 — 252nd most senior of the 2208 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: MITCHELL WELL (1909-03-23). Immediately behind: MORRIS RANCH WELL NO 1 (1909-06-01).
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 |
|---|---|---|---|---|---|---|---|
| 21670.0 | 1909-05-01 | 1911-08-03 | 3.0 | 0.0 | C | IRR | 259 |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 320 AF. Its most recent year on record, 2024, came in at 294 AF — 92% 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) |
|---|---|---|---|---|
| 2010 | 212 | 2nd lowest of 15 · 66% of median | 56 | 3.2 |
| 2011 | 334 | 11th lowest of 15 · 104% of median | 60 | 3.8 |
| 2012 | 217 | 3rd lowest of 15 · 68% of median | 95 | 1.9 |
| 2013 | 253 | 4th lowest of 15 · 79% of median | 101 | 1.7 |
| 2014 | 514 | 14th lowest of 15 · 161% of median | 81 | 7.5 |
| 2015 | 183 | 1st lowest of 15 · 57% of median | 67 | 1.9 |
| 2016 | 321 | 9th lowest of 15 · 100% of median | 81 | 3.8 |
| 2017 | 320 | 8th lowest of 15 · 100% of median | 79 | 3.1 |
| 2018 | 436 | 13th lowest of 15 · 136% of median | 113 | 4.1 |
| 2019 | 534 | 15th lowest of 15 · 167% of median | 98 | 4.0 |
| 2020 | 262 | 5th lowest of 15 · 82% of median | 51 | 3.0 |
| 2021 | 278 | 6th lowest of 15 · 87% of median | 70 | 3.0 |
| 2022 | 346 | 12th lowest of 15 · 108% of median | 80 | 3.0 |
| 2023 | 322 | 10th lowest of 15 · 101% of median | 75 | 3.0 |
| 2024 | 294 | 7th lowest of 15 · 92% of median | 63 | 3.0 |
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.