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ISLAND DITCH

Structure dossier · WDID 5900599 · 1 · GUNNISON RIVER · DWR record

Where this page's figures come from

Generated 2026-08-27 21:09 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 1881-05-31 — 72nd most senior of the 2360 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: HINKLE IRG DITCH (1881-05-15). Immediately behind: OTIS MOORE DITCH (1881-05-31).

Decreed rights (4)

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. UnitsUsesWhat the court said this water may be used for -- irrigation, municipal supply, augmentation and so on.Case
11474.01881-05-311906-09-14 1.00.0 CIRR 28
30667.183831900-05-011941-04-29 8.00.0 CIRR 378
38131.01954-05-261957-06-20 2.30.0 CIRRFIS 520
39598.01958-06-011961-01-27 3.50.0 CIRR 577

Recorded use (last 15 years on record)

In a median year this structure has a recorded diversion of 193 AF. Its most recent year on record, 2025, came in at 47 AF — 24% of that, and 1st lowest of the 15 years with a recorded volume.

YearDiverted (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 recordDays recordedPeak (cfs)
2011 195 9th lowest of 15 · 101% of median 145 1.1
2012 511 15th lowest of 15 · 265% of median 155 2.0
2013 395 13th lowest of 15 · 205% of median 163 2.0
2014 291 11th lowest of 15 · 151% of median 150 1.7
2015 305 12th lowest of 15 · 158% of median 155 1.7
2016 193 8th lowest of 15 · 100% of median 153 1.2
2017 189 7th lowest of 15 · 98% of median 151 1.0
2018 261 10th lowest of 15 · 135% of median 142 1.2
2019 398 14th lowest of 15 · 206% of median 151 2.3
2020 112 3rd lowest of 15 · 58% of median 100 0.7
2021 175 5th lowest of 15 · 91% of median 151 0.8
2022 150 4th lowest of 15 · 78% of median 129 0.8
2023 181 6th lowest of 15 · 94% of median 119 0.9
2024 74 2nd lowest of 15 · 38% of median 66 0.7
2025 47 1st lowest of 15 · 24% of median 62 0.4

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.