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DILLE TUNNEL

Structure dossier · WDID 0400540 · PIPELINE · BIG THOMPSON RIVER · DWR record

Dille Tunnel is a pipeline on Big Thompson 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 2026-10-14 00:08 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

Where this structure is measured

GageFlowing nowRecordHow we know
DILLE TUNNEL NEAR DRAKE DILTUNCO 0.0 cfs 1950–2026, 31,208 days DWR telemetry mapping

A green link is DWR's own: either its telemetry inventory maps this WDID to that station, or the station is named for this WDID (0700553 → 0700553A). An amber one is ours — the station sits within 250 m and shares a distinctive word with this structure's name, which is a strong hint rather than a DWR statement that this gage meters this structure. Wrong? Tell us.

Flowing now

0.0 cfs as of 2026-10-13 20:30 (3.6 h ago)

Zero is a real reading: the gage is reporting, and it says this structure is not diverting right now.

Provisional 15-minute telemetry from DILTUNCO ↗ (DILLE TUNNEL NEAR DRAKE). Raw, not the approved record — it is never merged into the diversion history below. DWR publishes the official diversion record after the water year closes and is approved, which is why that record ends months back while this reads minutes ago.

In short

DILLE TUNNEL holds 26 decreed rights on BIG THOMPSON RIVER. A call at FARMERS IRRIGATION CANAL on BIG THOMPSON RIVER (1873-04-30) currently reaches it: junior rights called out. 6 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 23,049 acre-feet. It was a party to 8 court cases that also touched 16 other structures.

Assembled from the figures on this page — every number above is checked against them before it is shown (7 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 FARMERS IRRIGATION CANAL (BIG THOMPSON RIVER, priority 1873-04-30).

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 1861-11-10 — 12th most senior of the 1296 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: LOVELAND GREELEY CANAL (1861-11-10). Immediately behind: SOUTH SIDE DITCH (1861-11-10).

On MAINSTEM at river mile 39.6, it is 232nd of 487 down the reach. Immediately upstream: LARIMER CO SPRING F. Immediately downstream: ARKINS SUPPLY CNL.

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 (27)

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
4332.00000 1861-11-101883-05-28 0.0 cfs 0.0 13.1608 cfs Irrigation, Municipal +6 02CW0392, 07CW0325 +3
4332.00000 1861-11-101883-05-28 0.0 AF 0.0 222.6 AF Irrigation, Municipal +6 02CW0392, 07CW0325 +3
4839.00000 1863-04-011883-05-28 0.0 cfs 0.0 6.0871 cfs Irrigation, Municipal +6 82CW0202, 02CW0392 +1
5235.00000 1864-05-011883-05-28 0.0 cfs 0.0 6.6141 cfs Irrigation, Municipal +6 02CW0392, 82CW0202 +1
5772.00000 1865-10-201883-05-28 0.0 cfs 0.0 11.0097 cfs Irrigation, Municipal +6 87CW0178, 82CW0202 +4
5784.00000 1865-11-011883-05-28 0.0 cfs 0.0 5.0126 cfs Municipal 02CW0392, 03CW0354
5923.00000 1866-03-201883-05-28 0.0 cfs 0.0 4.27 cfs Irrigation, Municipal +6 82CW0202
6269.00000 1867-03-011883-05-28 0.0 cfs 0.0 9.0189 cfs Irrigation, Municipal +6 82CW0202, 87CW0178 +1
6361.00000 1867-06-011883-05-28 0.0 cfs 0.0 7.154 cfs Irrigation, Municipal +6 02CW0392, 03CW0354 +4
7598.00000 1870-10-201883-05-28 0.0 cfs 0.0 32.9643 cfs Irrigation, Municipal +6 03CW0354, 82CW0202 +1
7944.00000 1871-10-011883-05-28 0.0 cfs 0.0 14.484 cfs Irrigation, Municipal +6 02CW0392, 82CW0202 +1
8157.00000 1872-05-011883-05-28 0.0 cfs 0.0 4.4241 cfs Irrigation, Municipal +6 82CW0202, 87CW0178 +1
8522.00000 1873-05-011883-05-28 0.0 cfs 0.0 36.9929 cfs Irrigation, Municipal +6 02CW0392, 87CW0178
8575.00000 1873-06-231883-05-28 0.0 cfs 0.0 11.8224 cfs Irrigation, Municipal +6 87CW0178, 82CW0202 +4
8699.00000 1873-10-251883-05-28 0.0 cfs 0.0 29.9753 cfs Irrigation, Municipal +6 02CW0392, 82CW0202 +1
10167.00000 1877-11-011883-05-28 0.0 cfs 0.0 13.6459 cfs Irrigation, Municipal +6 02CW0392, 87CW0178
10532.00000 1878-11-011883-05-28 0.0 cfs 0.0 12.8344 cfs Irrigation, Municipal +6 03CW0354, 82CW0202 +1
11269.00000 1880-11-071883-05-28 0.0 cfs 0.0 40.2594 cfs Irrigation, Municipal +6 82CW0202
12313.00000 1883-09-171883-05-28 0.0 cfs 0.0 0.0002 cfs Irrigation, Municipal +6 87CW0178
13563.00000 1887-02-181916-06-29 0.0 cfs 0.0 3.0 cfs Municipal 84CW0421
14691.13563 1887-02-181916-06-29 0.0 cfs 0.0 0.5 cfs Irrigation, Municipal +6 82CW0202
18719.00000 1901-04-021916-06-29 0.0 cfs 0.0 2.5 cfs Irrigation, Municipal +6 82CW0202
30572.00000 1933-09-141939-11-14 385.0 cfs 0.0 — Storage, Irrigation +4 81CW0149, CA10077 +1
47847.47664 1980-07-011981-12-31 6.0 cfs 0.0 — Irrigation 81CW0007
55881.00000 2002-12-302002-12-31 0.0 cfs 0.0 388.5 cfs Municipal 02CW0393, 02CW0394
60630.39945 1959-05-142016-12-31 146.0 cfs 0.0 — Power generation 16CW3193
60630.53490 1996-06-132016-12-31 254.0 cfs 0.0 — Power generation 16CW3193

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 791.0 cfs decreed rate, the average day over the last 6 year(s) had 41.296 cfs in priority (5% of the decree). No call in effect is a free river — that was 3.8% of days.

On 57 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 10 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 0.0 cfs 0% 0 365
2024 93.07 cfs 12% 29 297
2023 197.97 cfs 25% 41 308
2022 0.0 cfs 0% 0 364
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%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-12 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-11 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-10 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-09 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-08 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-07 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-06 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-05 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-04 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-03 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-02 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-10-01 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-30 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-29 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-28 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-27 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-26 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-25 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-24 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-23 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-22 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-21 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-20 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-19 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-18 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-17 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-16 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-15 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-14 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-13 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-12 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-11 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-10 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-09 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-08 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-07 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-06 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-05 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-04 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-03 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-02 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-09-01 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-31 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-30 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-29 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-28 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-27 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-26 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-25 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-24 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-23 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-22 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-21 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-20 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-19 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-18 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-17 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-16 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-15 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-14 0.0 cfs (0%) HILLSBOROUGH DITCH, 1861-11-10 · Big Thompson River · same source, at or above the calling point
2026-08-13 0.0 cfs (0%) HILLSBOROUGH DITCH, 1861-11-10 · Big Thompson River · same source, at or above the calling point
2026-08-12 0.0 cfs (0%) HILLSBOROUGH DITCH, 1861-11-10 · Big Thompson River · same source, at or above the calling point
2026-08-11 0.0 cfs (0%) HILLSBOROUGH DITCH, 1861-11-10 · Big Thompson River · same source, at or above the calling point
2026-08-10 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-09 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-08 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-07 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-04-01 · Big Thompson River · same source, at or above the calling point
2026-08-06 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-08-05 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-08-04 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-08-03 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-08-02 0.0 cfs (0%) HILLSBOROUGH DITCH, 1865-02-25 · Big Thompson River · same source, at or above the calling point
2026-08-01 0.0 cfs (0%) HILLSBOROUGH DITCH, 1865-10-20 · Big Thompson River · same source, at or above the calling point
2026-07-31 0.0 cfs (0%) HILLSBOROUGH DITCH, 1865-10-20 · Big Thompson River · same source, at or above the calling point
2026-07-30 0.0 cfs (0%) HILLSBOROUGH DITCH, 1865-02-25 · Big Thompson River · same source, at or above the calling point
2026-07-29 0.0 cfs (0%) HILLSBOROUGH DITCH, 1865-02-25 · Big Thompson River · same source, at or above the calling point
2026-07-28 0.0 cfs (0%) HILLSBOROUGH DITCH, 1865-10-20 · Big Thompson River · same source, at or above the calling point
2026-07-27 0.0 cfs (0%) HILLSBOROUGH DITCH, 1865-10-20 · Big Thompson River · same source, at or above the calling point
2026-07-26 0.0 cfs (0%) HILLSBOROUGH DITCH, 1865-11-01 · Big Thompson River · same source, at or above the calling point
2026-07-25 0.0 cfs (0%) BIG T PLATTE R DITCH, 1865-11-18 · Big Thompson River · same source, at or above the calling point
2026-07-24 0.0 cfs (0%) HILLSBOROUGH DITCH, 1865-10-20 · Big Thompson River · same source, at or above the calling point
2026-07-23 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-22 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-21 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-20 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-19 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-18 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-17 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-16 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-15 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-14 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-13 0.0 cfs (0%) HILLSBOROUGH DITCH, 1863-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-12 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-11 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-10 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-09 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-08 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-07 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-06 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-05 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-04 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-03 0.0 cfs (0%) HILLSBOROUGH DITCH, 1864-05-01 · Big Thompson River · same source, at or above the calling point
2026-07-02 0.0 cfs (0%) HILLSBOROUGH DITCH, 1865-02-25 · Big Thompson River · same source, at or above the calling point
2026-07-01 0.0 cfs (0%) HILLSBOROUGH DITCH, 1865-10-20 · Big Thompson River · same source, at or above the calling point
2026-06-30 0.0 cfs (0%) BIG T PLATTE R DITCH, 1866-06-30 · Big Thompson River · same source, at or above the calling point
2026-06-29 0.0 cfs (0%) BIG T PLATTE R DITCH, 1867-03-01 · Big Thompson River · same source, at or above the calling point
2026-06-28 0.0 cfs (0%) BIG T PLATTE R DITCH, 1867-03-01 · Big Thompson River · same source, at or above the calling point
2026-06-27 0.0 cfs (0%) BIG T PLATTE R DITCH, 1867-03-01 · Big Thompson River · same source, at or above the calling point
2026-06-26 0.0 cfs (0%) BIG T PLATTE R DITCH, 1867-03-01 · Big Thompson River · same source, at or above the calling point
2026-06-25 0.0 cfs (0%) BIG T PLATTE R DITCH, 1867-03-01 · Big Thompson River · same source, at or above the calling point
2026-06-24 0.0 cfs (0%) BIG T PLATTE R DITCH, 1867-03-01 · Big Thompson River · same source, at or above the calling point
2026-06-23 0.0 cfs (0%) BIG T PLATTE R DITCH, 1867-03-01 · Big Thompson River · same source, at or above the calling point
2026-06-22 0.0 cfs (0%) BIG T PLATTE R DITCH, 1867-06-01 · Big Thompson River · same source, at or above the calling point
2026-06-21 0.0 cfs (0%) BIG T PLATTE R DITCH, 1867-06-01 · Big Thompson River · same source, at or above the calling point
2026-06-20 0.0 cfs (0%) BIG T PLATTE R DITCH, 1870-10-20 · Big Thompson River · same source, at or above the calling point
2026-06-19 0.0 cfs (0%) BIG T PLATTE R DITCH, 1870-10-20 · Big Thompson River · same source, at or above the calling point
2026-06-18 0.0 cfs (0%) BIG T PLATTE R DITCH, 1870-10-20 · Big Thompson River · same source, at or above the calling point
2026-06-17 0.0 cfs (0%) BIG T PLATTE R DITCH, 1870-10-20 · Big Thompson River · same source, at or above the calling point
2026-06-16 0.0 cfs (0%) BIG T PLATTE R DITCH, 1871-10-01 · Big Thompson River · same source, at or above the calling point
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: 3992, of which 2690 sit on a river it flows into.

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 4332.00000 · never out of priority in these seasons
AprMayJunJulAugSep
middle right · admin 8699.00000 · peaks at 11 of 11 seasons
AprMayJunJulAugSep
most junior right · admin 60630.53490 · peaks at 11 of 11 seasons
AprMayJunJulAugSep

Snow sets the clock here. In the driest third of snow years (3 seasons), 2 seasons stayed under call throughout and 0 ended free. In the middle third (5 seasons), the call settled in for the season around June 10 (June 3 to June 24 across those years); in 2 of them it never lifted at all. In the wettest third (3 seasons), the call settled in for the season around July 8 (June 17 to July 8 across those years); in 1 of them it never lifted at all.

Snow years ranked by the district’s April 1 snow-water percentile across 2 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 23,049 AF. Its most recent year on record, 2025, came in at 2,410 AF — 10% of that, and 1st 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 75,421 15th lowest of 15 · 327% of median 183 685.0
2011 55,927 13th lowest of 15 · 243% of median 183 398.0
2012 24,069 9th lowest of 15 · 104% of median 159 471.4
2013 15,403 6th lowest of 15 · 67% of median 122 164.0
2014 2,423 2nd lowest of 15 · 10% of median 41 72.0
2016 23,049 8th lowest of 15 · 100% of median 87 391.0
2017 56,448 14th lowest of 15 · 245% of median 186 403.0
2018 4,522 3rd lowest of 15 · 20% of median 72 136.0
2019 38,940 10th lowest of 15 · 169% of median 164 401.3
2020 41,297 11th lowest of 15 · 179% of median 162 386.0
2021 13,601 5th lowest of 15 · 59% of median 143 250.0
2022 5,377 4th lowest of 15 · 23% of median 110 101.0
2023 18,732 7th lowest of 15 · 81% of median 106 400.1
2024 48,166 12th lowest of 15 · 209% of median 179 400.0
2025 2,410 1st lowest of 15 · 10% of median 63 50.6

Call-derived yield: senior right divertible 100.0% of a median season / 61.2% dry-year.

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 27 right(s), seniority decoded
diversion record current 3297 measured days, newest 402 day(s) before the data's end (DWR publishes ~1 year in arrears)
record continuity patchy 48% of the irrigation seasons in 1993-2025 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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