Hydrohistorian
← My Water · Print / save as PDF
MAY GRAY DITCH
Structure dossier · WDID 4700762 · 1 · GRIZZLY CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 20:37 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.
Which of its rights get called out?
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 1903-09-21 — 308th 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: MANVILLE DITCH NO 2 (1903-06-29). Immediately behind: GOULD DITCH (1904-11-01).
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 |
|---|---|---|---|---|---|---|---|
| 19621.0 | 1903-09-21 | 1908-07-01 | 2.0 | 0.0 | C | IRR | 169 |
| 23984.0 | 1915-09-01 | 1921-08-02 | 3.0 | 0.0 | C | IRR | 211 |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 307 AF. Its most recent year on record, 2024, 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) |
|---|---|---|---|---|
| 2006 | 376 | 12th lowest of 15 · 122% of median | 54 | 6.0 |
| 2007 | 317 | 9th lowest of 15 · 103% of median | 56 | 5.1 |
| 2008 | 302 | 7th lowest of 15 · 98% of median | 37 | 6.8 |
| 2009 | 380 | 13th lowest of 15 · 124% of median | 47 | 6.0 |
| 2010 | 385 | 14th lowest of 15 · 125% of median | 42 | 6.0 |
| 2011 | 252 | 4th lowest of 15 · 82% of median | 25 | 6.5 |
| 2013 | 263 | 5th lowest of 15 · 86% of median | 33 | 5.5 |
| 2014 | 323 | 10th lowest of 15 · 105% of median | 41 | 5.0 |
| 2015 | 307 | 8th lowest of 15 · 100% of median | 47 | 4.0 |
| 2016 | 81 | 2nd lowest of 15 · 26% of median | 64 | 0.7 |
| 2017 | 327 | 11th lowest of 15 · 106% of median | 55 | 3.2 |
| 2018 | 272 | 6th lowest of 15 · 89% of median | 48 | 3.2 |
| 2019 | 752 | 15th lowest of 15 · 245% of median | 54 | 7.2 |
| 2020 | 251 | 3rd lowest of 15 · 82% of median | 50 | 6.0 |
| 2024 | 0 | 1st lowest of 15 · 0% of median | 1 | 0.0 |
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.