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LARIMER WELD RES

Structure dossier · WDID 0303805 · RESERVOIR · CACHE LA POUDRE RIVER · DWR record

Larimer Weld Res is a reservoir on Cache La Poudre 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 2026-10-16 12:45 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.

The record and the river

In short

LARIMER WELD RES holds 4 decreed rights on CACHE LA POUDRE RIVER. A call at OGILVY DITCH on CACHE LA POUDRE RIVER (1884-04-10) currently reaches it: fully called out. 1 further call state no district and sit outside this one, so it is counted here rather than assumed either way. That is today's position; the weeks ahead cannot be projected for it: no administrative call record for this basin. In a median year over its last 15 recorded years it diverts 9,973 acre-feet.

Assembled from the figures on this page — every number above is checked against them before it is shown (5 checked). The detail, with its method, is in the cards below.

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.

Current administration

● Fully called out — call at OGILVY DITCH (CACHE LA POUDRE RIVER, priority 1884-04-10).

Which of its rights are out of priority?

The outlook for the weeks ahead is not computable for this structure: no administrative call record for this basin. 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 1890-06-30 — 209th most senior of the 2964 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: LONGS PEAK SPG WELL 8 (1889-12-31). Immediately behind: BRACKENBURY RANCH WELL 2 (1890-12-31).

On MAINSTEM at river mile 117.9, it is 463rd of 818 down the reach. Immediately upstream: VANDEWARK DITCH. Immediately downstream: JOSH AMES DITCH.

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
14791.00000 1890-06-301904-12-09 5165.0 AF 0.0 — Irrigation CA1591
16527.00000 1895-04-011904-12-09 2296.0 AF 0.0 — Irrigation CA1591
20333.00000 1905-09-021922-04-22 2296.0 AF 0.0 — Irrigation CA2031
35050.31888 1937-04-221953-09-10 633.0 AF 0.0 — Irrigation CA11217

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.

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 9,973 AF. Its most recent year on record, 2025, came in at 0 AF — 0% of that, and 1st 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 15,667 13th lowest of 15 · 157% of median 14,794 327 135.1
2012 11,318 10th lowest of 15 · 114% of median 14,056 299 76.1
2013 6,714 5th lowest of 15 · 67% of median 14,070 124 225.0
2014 4,536 4th lowest of 15 · 46% of median 8,373 296 29.8
2015 2,970 3rd lowest of 15 · 30% of median 12,211 138 47.8
2016 7,900 6th lowest of 15 · 79% of median 15,018 277 50.7
2017 10,961 9th lowest of 15 · 110% of median 15,368 251 75.0
2018 9,881 7th lowest of 15 · 99% of median 7,183 281 80.4
2019 9,973 8th lowest of 15 · 100% of median 8,039 310 72.9
2020 12,820 11th lowest of 15 · 128% of median 7,731 303 88.8
2021 16,588 14th lowest of 15 · 166% of median 18,226 357 165.7
2022 17,501 15th lowest of 15 · 176% of median 19,164 365 104.8
2023 13,892 12th lowest of 15 · 139% of median 10,489 290 134.6
2024 1,622 2nd lowest of 15 · 16% of median 10,703 41 30.0
2025 0 1st lowest of 15 · 0% of median — 41 0.0

How good is our record of it?

Grade A (9/10 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 5694 measured days, newest 383 day(s) before the data's end (DWR publishes ~1 year in arrears)
record continuity patchy 50% of the irrigation seasons in 1972-2025 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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