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MCELROY NO 1 PUMP

Structure dossier · WDID 5000612 · 8 · COLORADO RIVER · DWR record

Where this page's figures come from

Generated 2026-08-27 21:04 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 1882-10-10 — 142nd most senior of the 360 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: MCELROY NO 2 PUMP (1881-12-20). Immediately behind: D H RIGGLE DITCH NO 1 (1884-08-12).

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
32335.119711882-10-101941-07-17 12.00.0 CIRR 167

Recorded use (last 15 years on record)

In a median year this structure has a recorded diversion of 809 AF. Its most recent year on record, 2024, came in at 476 AF — 59% of that, and 2nd 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)
2010 833 10th lowest of 15 · 103% of median 40 12.0
2011 405 1st lowest of 15 · 50% of median 18 12.0
2012 833 10th lowest of 15 · 103% of median 40 12.0
2013 881 12th lowest of 15 · 109% of median 42 12.0
2014 785 7th lowest of 15 · 97% of median 36 12.0
2015 809 8th lowest of 15 · 100% of median 38 12.0
2016 571 4th lowest of 15 · 71% of median 26 12.0
2017 595 5th lowest of 15 · 74% of median 27 12.0
2018 809 8th lowest of 15 · 100% of median 37 12.0
2019 928 13th lowest of 15 · 115% of median 41 12.0
2020 1,186 15th lowest of 15 · 147% of median 59 12.0
2021 476 2nd lowest of 15 · 59% of median 35 10.0
2022 595 5th lowest of 15 · 74% of median 42 10.0
2023 1,079 14th lowest of 15 · 133% of median 54 12.0
2024 476 2nd lowest of 15 · 59% of median 32 10.0

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.