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THOMPSON-EPPERSON DITCH

Structure dossier · WDID 3100511 · 1 · LOS PINOS RIVER · DWR record

Where this page's figures come from

Generated 2026-08-27 19:17 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.

Where it sits in line

Priority 1877-12-31 — 280th most senior of the 1037 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: BEAN DITCH (1877-04-15). Immediately behind: LOS PINOS IRRIGATING DITCH (1878-03-01).

Decreed rights (6)

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
10227.01877-12-311934-06-12 4.750.0 CIRR P-3
12784.01884-12-311934-06-12 0.6250.0 CIRR P-18
16436.01894-12-311934-06-12 4.550.0 CIRR P-24
16892.01896-03-311934-06-12 12.00.0 CIRR P-25
18536.01900-10-011934-06-12 11.6810.0 CIRR P-26
19266.01902-10-011934-06-12 1.750.0 CIRR P-32

Recorded use (last 15 years on record)

In a median year this structure has a recorded diversion of 9,498 AF. Its most recent year on record, 2025, came in at 9,963 AF — 105% of that, and 10th lowest of the 15 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)
2011 10,005 11th lowest of 15 · 105% of median — 171 43.9
2012 10,184 12th lowest of 15 · 107% of median — 170 39.3
2013 8,895 4th lowest of 15 · 94% of median — 154 37.3
2014 8,860 3rd lowest of 15 · 93% of median — 165 42.6
2015 9,284 7th lowest of 15 · 98% of median — 192 40.5
2016 9,212 5th lowest of 15 · 97% of median — 208 40.5
2017 9,725 9th lowest of 15 · 102% of median — 163 41.3
2018 8,226 1st lowest of 15 · 87% of median — 161 35.7
2019 10,730 14th lowest of 15 · 113% of median — 178 43.0
2020 11,033 15th lowest of 15 · 116% of median — 275 54.9
2021 9,498 8th lowest of 15 · 100% of median — 365 34.9
2022 9,254 6th lowest of 15 · 97% of median — 365 35.7
2023 10,382 13th lowest of 15 · 109% of median — 365 43.0
2024 8,820 2nd lowest of 15 · 93% of median — 366 42.6
2025 9,963 10th lowest of 15 · 105% of median — 304 41.8

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.