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THORNTON COOLEY PIT RES

Structure dossier · WDID 0203325 · RESERVOIR · SOUTH PLATTE RIVER · DWR record

Where this page's figures come from

Generated 2026-08-27 19:50 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (e70d0b5) — every figure regenerates from this named code version and data image.

Current administration

● In priority — no active call senior to this structure's rights affects its district (23 active call(s) checked).

Where it sits in line

Priority 1991-12-31 — 10690th most senior of the 21881 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: 0200989 (1991-12-31). Immediately behind: 0203707 (1991-12-31).

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
51864.01991-12-311991-12-31 0.04411.37 AIRRMUNCOMINDRECFISFIRDOMAUGPWR

Recorded use (last 14 years on record)

In a median year this structure has a recorded diversion of 1,452 AF. Its most recent year on record, 2025, came in at 1,741 AF — 120% of that, and 9th lowest of the 14 years with a recorded volume.

This structure records both diversions and reservoir releases — they are separate water movements and are accounted separately below.

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 recordReleased (AF)Days recordedPeak (cfs)
2012 56 1st lowest of 14 · 4% of median 22 61 6.8
2013 1,287 7th lowest of 14 · 89% of median 401 365 16.2
2014 302 2nd lowest of 14 · 21% of median 873 365 2.5
2015 361 3rd lowest of 14 · 25% of median 584 365 5.1
2016 2,015 11th lowest of 14 · 139% of median 2,541 366 42.2
2017 897 5th lowest of 14 · 62% of median 2,179 365 11.3
2018 760 4th lowest of 14 · 52% of median 643 365 9.1
2019 1,062 6th lowest of 14 · 73% of median 3,468 365 5.9
2020 3,924 12th lowest of 14 · 270% of median 6,542 366 45.0
2021 15,077 13th lowest of 14 · 1039% of median 12,474 365 116.1
2022 20,220 14th lowest of 14 · 1393% of median 10,990 365 191.6
2023 1,616 8th lowest of 14 · 111% of median 6,347 365 23.4
2024 1,884 10th lowest of 14 · 130% of median 3,660 366 12.2
2025 1,741 9th lowest of 14 · 120% of median 2,543 304 16.7

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.