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LAFAYETTE DITCH 1

Structure dossier · WDID 0600880 · DITCH · COAL CREEK · DWR record · probably LAFAYETTE CITY OF’s (matched on DWR’s contact or an EPA intake name; verify below)

Lafayette Ditch 1 is a ditch on Coal Creek 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 2026-10-14 04:14 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

LAFAYETTE DITCH 1 holds 9 decreed rights on COAL CREEK. A call at RURAL DITCH on BOULDER CREEK (1862-05-09), and 1 other currently reaches it: junior rights called out. 7 further calls state no district and sit outside this one, so they are counted here rather than assumed either way. That is today's position; the weeks ahead cannot be projected for it: no gage record for this year at this date, so there is nothing to find analogs for. In a median year over its last 15 recorded years it diverts 18 acre-feet. That use is falling by about 1.6 acre-feet a year over 15 years (p=0.03312552483120834). It was a party to 10 court cases that also touched 20 other structures.

Assembled from the figures on this page — every number above is checked against them before it is shown (12 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 (diversion). Faint dots are the neighbouring water; click any to open it.

Current administration

● Junior rights called out — call at RURAL DITCH (BOULDER CREEK, priority 1862-05-09).

● Junior rights called out — call at HOWELL DITCH (BOULDER CREEK, priority 1859-12-01).

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 1859-10-01 — 14th most senior of the 1867 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: 0600879 (1859-10-01). Immediately behind: NEW DRY CR CARRIER DITCH (1859-10-01).

On COAL CREEK at river mile 11.1, it is 25th of 29 down the reach. Immediately upstream: T N WILLIS DITCH. Immediately downstream: BECK PUMP STATION.

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 (9)

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
3561.00000 1859-10-011882-06-02 0.0 cfs 0.0 0.749 cfs Irrigation, Municipal +7 97CW0195
7457.00000 1870-06-011882-06-02 0.0 cfs 0.0 1.696 cfs Irrigation, Municipal +7 97CW0195
47116.46613 1977-08-151979-12-31 5.52 cfs 0.0 — Irrigation, Municipal +6 79CW0385, 06CW0226 +1
47481.00000 1979-12-311979-12-31 0.0 cfs 0.0 16.0 cfs Irrigation, Municipal +6 02CW0281, 79CW0387 +1
47847.00000 1980-12-311980-12-31 0.0 cfs 0.0 8.0 cfs Irrigation, Municipal +6 79CW0387
51269.00000 1990-05-151990-12-31 0.0 cfs 0.0 8.0 cfs Irrigation, Municipal +7 90CW0108, 99CW0125
53872.00000 1997-06-301997-12-31 0.0 cfs 0.0 8.0 cfs Irrigation, Municipal +7 06CW0150, 97CW0195
58804.58227 2009-06-022011-12-31 0.0 cfs 0.0 3.5 cfs All beneficial uses 11CW0298
58825.00000 2011-01-212011-12-31 0.0 cfs 0.0 8.0 cfs Irrigation, Municipal +7 05CW0295

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.

How much of this decree was in priority, by day

A right is in priority on a day when it is senior to every call administering this structure. Of its 5.52 cfs decreed rate, the average day over the last 6 year(s) had 0.748 cfs in priority (14% of the decree). No call in effect is a free river — that was 9.6% of days.

On 30 days some rights were in priority and others were not — seniority splits a decree rather than switching it off. Calls are set and released at a time of day, not at midnight, so a day is counted by the hour: a call setting at 4pm costs that day a third of its rate, not all of it. A call began or ended mid-day on 28 of these days.

This is paper water. It is the decreed rate that was in priority — not water that was physically in the stream, and not water this structure diverted. A ditch can be in priority for 50 cfs on a day the creek carries five. What that distinction means →

YearMean in priority (Apr–Sep) Share of decreeFree-river days Days fully out
2026 0.0 cfs 0% 0 286
2025 0.26 cfs 5% 15 330
2024 1.27 cfs 23% 90 248
2023 2.25 cfs 41% 69 259
2022 0.06 cfs 1% 1 362
2021 0.0 cfs 0% 0 79
Show the last 120 days, day by day
DateIn priorityControlling call
2026-10-13 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-10-12 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-10-11 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-10-10 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-10-09 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-10-08 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-10-07 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-10-06 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-10-05 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-10-04 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-10-03 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-10-02 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-10-01 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-30 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-29 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-28 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-27 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-26 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-25 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-24 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-23 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-22 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-21 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-20 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-19 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-18 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-17 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-16 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-15 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-14 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-13 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-12 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-11 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-10 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-09 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-08 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-07 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-06 0.0 cfs (0%) BOULDER WELD CTY DITCH, 1861-06-01 · Boulder Creek · on a river this source flows into
2026-09-05 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-09-04 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-09-03 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-09-02 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-09-01 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-31 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-30 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-29 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-28 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-27 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-26 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-08-25 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-08-24 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-08-23 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-08-22 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-21 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-20 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-19 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-18 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-17 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-16 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-15 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-14 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-13 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-08-12 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-08-11 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-08-10 0.0 cfs (0%) HOWELL DITCH, 1860-10-01 · Boulder Creek · on a river this source flows into
2026-08-09 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-08 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-07 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-06 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-05 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-04 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-03 0.0 cfs (0%) RURAL DITCH, 1862-05-10 · Boulder Creek · on a river this source flows into
2026-08-02 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-08-01 0.0 cfs (0%) RURAL DITCH, 1862-09-15 · Boulder Creek · on a river this source flows into
2026-07-31 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-30 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-29 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-28 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-27 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-26 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-25 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-24 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-23 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-22 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-21 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-20 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-19 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-18 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-17 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-16 0.0 cfs (0%) RURAL DITCH, 1862-06-01 · Boulder Creek · on a river this source flows into
2026-07-15 0.0 cfs (0%) RURAL DITCH, 1862-09-15 · Boulder Creek · on a river this source flows into
2026-07-14 0.0 cfs (0%) RURAL DITCH, 1862-09-15 · Boulder Creek · on a river this source flows into
2026-07-13 0.0 cfs (0%) RURAL DITCH, 1862-09-15 · Boulder Creek · on a river this source flows into
2026-07-12 0.0 cfs (0%) RURAL DITCH, 1862-09-15 · Boulder Creek · on a river this source flows into
2026-07-11 0.0 cfs (0%) RURAL DITCH, 1862-09-15 · Boulder Creek · on a river this source flows into
2026-07-10 0.0 cfs (0%) RURAL DITCH, 1862-09-15 · Boulder Creek · on a river this source flows into
2026-07-09 0.0 cfs (0%) RURAL DITCH, 1862-09-15 · Boulder Creek · on a river this source flows into
2026-07-08 0.0 cfs (0%) RURAL DITCH, 1862-09-15 · Boulder Creek · on a river this source flows into
2026-07-07 0.0 cfs (0%) BOULDER CR MIN FLOW C, 1862-10-01 · Boulder Creek · on a river this source flows into
2026-07-06 0.0 cfs (0%) BOULDER CR MIN FLOW C, 1862-10-01 · Boulder Creek · on a river this source flows into
2026-07-05 0.0 cfs (0%) BOULDER CR MIN FLOW C, 1862-10-01 · Boulder Creek · on a river this source flows into
2026-07-04 0.0 cfs (0%) RURAL DITCH, 1862-10-01 · Boulder Creek · on a river this source flows into
2026-07-03 0.0 cfs (0%) RURAL DITCH, 1862-10-01 · Boulder Creek · on a river this source flows into
2026-07-02 0.0 cfs (0%) RURAL DITCH, 1862-10-01 · Boulder Creek · on a river this source flows into
2026-07-01 0.0 cfs (0%) RURAL DITCH, 1862-10-01 · Boulder Creek · on a river this source flows into
2026-06-30 0.0 cfs (0%) RURAL DITCH, 1862-10-01 · Boulder Creek · on a river this source flows into
2026-06-29 0.0 cfs (0%) RURAL DITCH, 1863-06-01 · Boulder Creek · on a river this source flows into
2026-06-28 0.0 cfs (0%) RURAL DITCH, 1868-05-01 · Boulder Creek · on a river this source flows into
2026-06-27 0.0 cfs (0%) RURAL DITCH, 1868-05-01 · Boulder Creek · on a river this source flows into
2026-06-26 0.0 cfs (0%) RURAL DITCH, 1868-05-01 · Boulder Creek · on a river this source flows into
2026-06-25 0.0 cfs (0%) RURAL DITCH, 1863-06-01 · Boulder Creek · on a river this source flows into
2026-06-24 0.0 cfs (0%) RURAL DITCH, 1863-06-01 · Boulder Creek · on a river this source flows into
2026-06-23 0.0 cfs (0%) RURAL DITCH, 1868-05-01 · Boulder Creek · on a river this source flows into
2026-06-22 0.0 cfs (0%) RURAL DITCH, 1868-05-01 · Boulder Creek · on a river this source flows into
2026-06-21 0.0 cfs (0%) RURAL DITCH, 1868-05-01 · Boulder Creek · on a river this source flows into
2026-06-20 0.0 cfs (0%) RURAL DITCH, 1868-05-01 · Boulder Creek · on a river this source flows into
2026-06-19 0.0 cfs (0%) RURAL DITCH, 1868-05-01 · Boulder Creek · on a river this source flows into
2026-06-18 0.0 cfs (0%) RURAL DITCH, 1870-06-01 · Boulder Creek · on a river this source flows into
2026-06-17 0.0 cfs (0%) RURAL DITCH, 1870-06-01 · Boulder Creek · on a river this source flows into
2026-06-16 0.0 cfs (0%) RURAL DITCH, 1870-06-01 · Boulder Creek · on a river this source flows into
How this is worked out, and what it cannot tell you
  • This is a decreed rate that was in priority -- paper water, not water that was available or diverted.
  • Augmentation plans, exchanges and substitute supply plans let a structure divert lawfully while out of priority; none are modelled.
  • Calls on the river this source flows into are included without a position test, so curtailment can be over-reported where the calling point sits above the confluence.
  • DWR's administration is the authority. Scored against DWR's own call analysis, this method agreed on 95.5% of 85,822 structure-days (2026-08-29).
  • Calls considered for this structure: 3395, of which 3395 sit on a river it flows into.

Water-court filings naming this structure

4 applications 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
2026-08 2026CW3125 reasonable diligence 2026-10-31 (17d left) CASE NUMBER 2026CW3125 (90CW108) (99CW125) (12CW72) (20CW3017) APPLICATION FOR FINDING OF REASONABLE DILIGENCE IN BOULDER COUNTY . 1. Name, Mailing Address, Phone Number, and E -mail Address of Applicant . CITY OF LAFAYE…
2026-06 2026CW3093 reasonable diligence closed 2026-08-31 CASE NUMBER 20 26CW3093 (05CW295) (19CW3201) APPLICATION FOR FINDING OF REASONABLE DILIGENCE IN BOULDER COUNTY. 1. Name, Mailing Address, Phone Number, and E -mail Address of Applicant . CITY OF LAFAYETTE , c/o Cari Bisc…
2025-10 2025CW3137 reasonable diligence closed 2025-12-31 CASE NUMBER 2025CW3137 (97CW195) (06CW150) (19CW3020) APPLICATION FOR FINDING OF REASONABLE DILIGENCE IN BOULDER COUNTY – 1. Name, Mailing Address, Phone Number, and E-mail Address of Applicant. CITY OF LAFAYETTE, c/o Ca…
2025-04 2025CW3049 reasonable diligence closed 2025-06-30 CASE NUMBER 2025CW3049 (79CW387) (93CW025) (01CW295) (02CW281) (18CW3035) APPLICATION FOR FINDING OF REASONABLE DILIGENCE IN BOULDER COUNTY. – 1. Name, Mailing Address, Phone Number, and E-mail Address of Applicant. CITY…

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.

How often is it out of priority?

Across the 11 seasons whose call record is complete enough to judge this structure (2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026), week by week from April.

most senior right · admin 3561.00000 · never out of priority in these seasons
AprMayJunJulAugSep
middle right · admin 47847.00000 · peaks at 11 of 11 seasons
AprMayJunJulAugSep
most junior right · admin 58825.00000 · peaks at 11 of 11 seasons
AprMayJunJulAugSep

Snow sets the clock here. In the driest third of snow years (3 seasons), the call settled in for the season around June 3; in 1 of them it never lifted at all. In the middle third (5 seasons), the call settled in for the season around June 24 (June 17 to July 8 across those years); in 1 of them it never lifted at all. In the wettest third (3 seasons), the call settled in for the season around June 24; in 2 of them it never lifted at all.

Snow years ranked by the district’s April 1 snow-water percentile across 3 SNOTEL sites; 11 seasons carry both a snow reading and a judgeable call record. How the past played out, not a forecast.

Why only 11 seasons, and what the bars mean

Each bar is one week: how many of those seasons that right was out of priority under a call this site can lawfully attribute to this structure. Green is never, red is every season on record.

The short record is a property of DWR's data, not of the river. A call only counts against a structure when we can establish it applies — by the districts named in its set comments, or by stream mile on the same source. DWR did not begin stating affected districts routinely until about 2015: fewer than one call in ten can be judged before then, against roughly two in three since. A season we cannot judge is not a season without calls, so it is dropped rather than counted as quiet — 12 seasons dropped here.

This is a frequency over past seasons, not a forecast. It says nothing about what the division engineer will do this year.

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 18 AF. Its most recent year on record, 2014, came in at 15 AF — 83% of that, and 5th 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)
1989 1 1st lowest of 15 · 6% of median 9 0.1
2000 30 11th lowest of 15 · 167% of median 108 0.7
2001 54 14th lowest of 15 · 300% of median 134 0.4
2002 108 15th lowest of 15 · 600% of median 146 2.3
2003 44 13th lowest of 15 · 244% of median 135 0.7
2004 21 9th lowest of 15 · 117% of median 75 0.5
2005 24 10th lowest of 15 · 133% of median 81 0.5
2006 43 12th lowest of 15 · 239% of median 149 0.5
2007 18 8th lowest of 15 · 100% of median 100 0.4
2008 17 7th lowest of 15 · 94% of median 138 0.3
2010 8 2nd lowest of 15 · 44% of median 92 0.2
2011 10 3rd lowest of 15 · 56% of median 120 0.3
2012 15 5th lowest of 15 · 83% of median 109 0.4
2013 11 4th lowest of 15 · 61% of median 99 0.1
2014 15 5th lowest of 15 · 83% of median 136 0.2

How good is our record of it?

Grade B (7/10 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 9 right(s), seniority decoded
diversion record stale 1631 measured days, but newest is 4371 day(s) before the data's end (target 450)
record continuity sparse 30% of the irrigation seasons in 1989-2014 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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