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THORNTON NO 1 DITCH

Structure dossier · WDID 5900694 · 1 · GUNNISON RIVER · DWR record

Where this page's figures come from

Generated 2026-08-28 02:53 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 1953-10-21 — 780th 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: SILKA RESERVOIR (1953-09-29). Immediately behind: TWIN BRIDGES ASSN DITCH (1953-11-13).

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. UnitsUsesWhat the court said this water may be used for -- irrigation, municipal supply, augmentation and so on.Case
37914.01953-10-211957-06-20 6.00.0 CIRR 517

Recorded use (last 15 years on record)

In a median year this structure has a recorded diversion of 124 AF. Its most recent year on record, 2025, came in at 153 AF — 123% of that, and 10th 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 155 11th lowest of 15 · 125% of median 69 1.5
2012 32 2nd lowest of 15 · 26% of median 98 0.2
2013 152 9th lowest of 15 · 123% of median 68 2.1
2014 222 14th lowest of 15 · 179% of median 101 1.4
2015 81 4th lowest of 15 · 65% of median 71 0.9
2016 262 15th lowest of 15 · 211% of median 69 3.2
2017 62 3rd lowest of 15 · 50% of median 96 0.6
2018 91 5th lowest of 15 · 73% of median 124 0.7
2019 102 6th lowest of 15 · 82% of median 95 0.7
2020 31 1st lowest of 15 · 25% of median 67 0.2
2021 221 13th lowest of 15 · 178% of median 178 1.0
2022 109 7th lowest of 15 · 88% of median 164 0.5
2023 193 12th lowest of 15 · 156% of median 120 1.5
2024 124 8th lowest of 15 · 100% of median 100 0.9
2025 153 10th lowest of 15 · 123% of median 100 1.3

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
CheckStateDetail
identity complete name, type, and water source all on file
decreed rights on file 1 right(s), seniority decoded
diversion record present 2375 measured days; currency unknown (no data-coverage date to compare against)
record continuity patchy 44% of the irrigation seasons in 2000-2025 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.