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HOLBROOK RESERVOIR

Structure dossier · WDID 1703511 · RESERVOIR · ARKANSAS RIVER · DWR record

Holbrook Reservoir is a reservoir on Arkansas River in Colorado. This page is its public record: the water it has a right to, whether it may take it today, and its history, compiled from the Colorado Division of Water Resources.

Source DWR administrative record · verify at DWR structure ↗ Source DWR administrative record · verify at DWR diversion records ↗ Source Our computation, scored against a reference · scored against DWR's call analysis, see /methods

Where this page's figures come from

Generated 2026-10-13 23:13 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260928 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (dd58e60) — every figure regenerates from this named code version and data image.

Download this structure

Everything on this page as data you can work with — and a README that makes it citable: the HydroBase snapshot it was built from, the build commit, what every column means, the method behind each derived figure, and that method's stated limits.

⇩ Full record (.zip) Print / save as PDF

Or one table at a time: rights.csv · annual_use.csv · curtailment_now.csv · court_cases.csv · co_parties.csv · call_climatology.csv

What is in the bundle
  • rights.csv — every decreed right, most senior first, with admin numbers, dates, amounts, uses and case numbers.
  • annual_use.csv — recorded diversion by year, with releases accounted separately.
  • curtailment_now.csv — each right's current priority status and how often it was out across analog years.
  • court_cases.csv — the cases attached to its rights.
  • co_parties.csv — the other structures that were parties to those cases. Not available anywhere else.
  • call_climatology.csv — how often each right has been out of priority by week of season, with confidence intervals and the seasons the record could actually judge.
  • README.txt — provenance, methods, limits, disclaimer, and links back to DWR's own records for verification.

Where it sits

Location as DWR records it (storage). Faint dots are the neighbouring water; click any to open it.

Dam safety

Dam HOLBROOK (completed 1890)
Hazard class Significant
Condition at last inspection Conditionally Satisfactory (2025-09-11)
Storage restriction None on file
Normal storage 6,258 AF
Physical status Active
Emergency action plan Yes

Source: DWR Dam Safety’s jurisdictional-dam inventory (damsafety/damsafetydaminfojd), refreshed weekly. DWR’s record for this dam carries no WDID and no matched NID id, so it is joined by name and position: “HOLBROOK” 0.178 mi away. More than half of Colorado’s jurisdictional dams can be reached no other way; judge the match before relying on it. Hazard class describes the consequence of failure, not the likelihood of it. DWR’s dam record.

Current administration

● Junior rights called out — call at ARKANSAS RIVER COMPACT(COLORADO-KANSAS STATE LINE) (ARKANSAS RIVER, priority 1949-05-30).

● Fully called out — call at LAS ANIMAS CONSOLIDATED (ARKANSAS RIVER, priority 1884-12-03).

Which of its rights are out of priority?

The outlook for the weeks ahead is not computable for this structure: no gage record for this year at this date, so there is nothing to find analogs for. Today’s position is a separate question, and it is answered in Current administration above — that screen reads the district’s active calls and needs no reference gage.

Where it sits in line

Priority 1892-03-02 — 18th most senior of the 1909 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: CANADY DITCH (1892-01-18). Immediately behind: LA JUNTA WELL NO 1 (1892-09-19).

On MAINSTEM at river mile 63.2, it is 275th of 458 down the reach. Immediately upstream: CHERRY SPRING NO 1. Immediately downstream: MANBY LAKE.

Position on the modelled network, not a claim about whose water this is — a stream carries water from many rights at once, and diverted water returns to it.

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. Alt-pointAn absolute amount decreed at another structure that may be diverted here instead -- an alternate point of diversion or an exchange. DWR calls this the APEX amount; a right showing 0.0 absolute but an alt-point amount is exercised here under another structure's decree. Decreed forWhat the court said this water may be used for -- irrigation, municipal supply, augmentation and so on.Case
15402.00000 1892-03-021905-04-08 4247.0611 AF 0.0 — Irrigation R2
20186.19640 1903-10-101927-02-03 2000.0 AF 0.0 — Irrigation, Domestic R20
21807.00000 1909-09-151927-02-03 1196.0 AF 0.0 — Irrigation, Domestic R49
58863.00000 2011-02-282011-12-31 0.0 AF 0.0 450.0 AF Irrigation, Municipal +5 11CW0013

Amounts marked cfs are flow rates; AF are stored volumes (storage rights are decreed in acre-feet). An absolute amount of 0.0 beside an alt-point amount is not a dead right: the water is decreed at another structure, and that row records permission to divert it here instead (an alternate point or exchange). A case listing several numbers reflects the original decree plus later change cases.

Water-court filings naming this structure

1 application in the monthly water-court resumes explicitly reference this WDID. The resume is the earliest public notice of a new claim (C.R.S. 37-92-302) — years before anything reaches the decree record below. Most applications name structures by name rather than WDID, so absence here is weak evidence of absence.

MonthCaseWhat it asksOppose byExcerpt
2026-02 2019CW3036 — closed 2026-04-30 CASE NO. 2019CW3036; LOWER ARKANSAS WATER MANAGEMENT ASSOCIATION (“LAWMA”), c/o Roy Cue, Manager, P. O. Box 1161, Lamar, Colorado 81052 (Please address all pleadings and inquiries regarding this matter to Applicant’s att…

Source: Judicial Branch combined monthly resumes (archive), indexed nightly; WDIDs attached only when a 7-digit token in the filing matches DWR’s structure inventory.

Recorded use (last 15 years on record)

Years far under the decreed amount? That gap has a name — paper water vs. wet water, explained on this structure.

In a median year this structure has a recorded diversion of 5,916 AF. Its most recent year on record, 2025, came in at 5,621 AF — 95% of that, and 7th 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)
2011 6,210 8th lowest of 14 · 105% of median 4,578 17 402.0
2012 — no recorded volume 1,688 0 —
2013 8,912 14th lowest of 14 · 151% of median 15,006 78 143.0
2014 4,249 4th lowest of 14 · 72% of median 3,191 61 489.0
2015 4,776 6th lowest of 14 · 81% of median 7,556 31 454.0
2016 8,820 13th lowest of 14 · 149% of median 1,615 30 454.0
2017 7,645 11th lowest of 14 · 129% of median 1,833 151 152.0
2018 2,563 3rd lowest of 14 · 43% of median 1,291 365 377.0
2019 8,612 12th lowest of 14 · 146% of median 3,426 334 530.0
2020 0 1st lowest of 14 · 0% of median 3,070 85 0.0
2021 4,596 5th lowest of 14 · 78% of median 3,185 365 523.0
2022 0 1st lowest of 14 · 0% of median — 365 0.0
2023 7,429 10th lowest of 14 · 126% of median — 365 440.0
2024 6,878 9th lowest of 14 · 116% of median 4,327 366 547.0
2025 5,621 7th lowest of 14 · 95% of median 6,609 303 377.2

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 4 right(s), seniority decoded
diversion record current 3182 measured days, newest 332 day(s) before the data's end (DWR publishes ~1 year in arrears)
record continuity sparse 22% of the irrigation seasons in 1959-2025 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.

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