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DENVER CONDUIT NO 20

Structure dossier · WDID 0801002 · PIPELINE · SOUTH PLATTE RIVER · DWR record

Denver Conduit No 20 is a pipeline on South Platte 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 00:41 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
DENVER WATER CONDUIT NO 20 COND20CO 114.0 cfs 2018–2026, 2,792 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

114.0 cfs as of 2026-10-13 23:45 (0.9 h ago)

Provisional 15-minute telemetry from COND20CO ↗ (DENVER WATER CONDUIT NO 20). 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

DENVER CONDUIT NO 20 holds 24 decreed rights on SOUTH PLATTE RIVER. As of 2026-10-02, 19 of them are out of priority under a call at admin 5112.00000 placed by SOUTH PLATTE RIVER AT WATERTON. Its 5 most senior rights, back to 1860-12-28, keep diverting. 4 further calls state no district and sit outside this one, so they are counted here rather than assumed either way. In a median year over its last 15 recorded years it diverts 38,945 acre-feet. It was a party to 7 court cases that also touched 37 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 SOUTH PLATTE RIVER COMPACT (SOUTH PLATTE RIVER, priority 1897-06-13).

● Junior rights called out — call at WESTERN MUTUAL DITCH (SOUTH PLATTE RIVER, priority 1871-10-04).

● Junior rights called out — call at SOUTH PLATTE RIVER AT WATERTON (SOUTH PLATTE RIVER, priority 1863-12-30).

● Junior rights called out — call at CHATFIELD RESERVOIR (SOUTH PLATTE RIVER, priority 1865-12-30).

● Junior rights called out — call at STERLING IRR CO DITCH 1 (SOUTH PLATTE RIVER, priority 1901-02-16).

Which of its rights are out of priority?

Under today's controlling call (SOUTH PLATTE RIVER AT WATERTON, priority 1863-12-30): 19 of this structure's 24 rights are out of priority now. (4 call(s) state no district and sit outside this one — not judged, not assumed.) In the 5 past years most like this one (2023, 2019, 2025, 2021, 2022), 3 of the rights shown below were out at least one week in at least one analog year.

Right (priority)NowAnalog years outMajority out by
1860-12-28 4015 ● in priority 0 of 5 —
1861-07-30 4229 ● in priority 0 of 5 —
1861-08-30 4260 ● in priority 0 of 5 —
1862-11-30 4717 ● in priority 0 of 5 —
1863-12-30 5112 ● in priority 0 of 5 —
1864-12-30 5478 ● out 0 of 5 —
1865-12-30 5843 ● out 0 of 5 —
… 14 more rights between these …
1910-12-06 22254 ● out 5 of 5 2026-10-02
1911-04-01 22370 ● out 5 of 5 2026-10-02
1921-07-04 29386 ● out 5 of 5 2026-10-02
How this table is built, and what it is not

“Now” compares each right's admin number with today's most senior applicable active call. The outlook uses flows at DENVER WATER CONDUIT NO 20 around 2026-10-02 (the newest reading on file) — currently 18% of that gage's own median for this window — to pick the 5 most similar past years with complete administration records (2011–2026). Only calls that verifiably apply count: DWR's own district statements in the call's set comments, a caller located in this district, or — on the same stream, where DWR records both stream miles (measured from the mouth) — a caller DOWNSTREAM of this structure. An upstream senior cannot demand water this diversion never deprives it of. Calls that state nothing and sit elsewhere are counted as unjudged rather than assumed, which also means the verified record is shorter than the raw one: early calls rarely state districts. For each week it finds the most senior call then in force; a right is out in that week exactly when that call is senior to it, which is why one line prices every right and juniors can be out while seniors keep diverting. “Majority out by” is the first week out in more than half the analog years. A frequency among named historical years, not a probability from a model, and not a forecast of what the division engineer will do. It says how often years whose flow resembled this one were under a call senior to this right in a given week. Snowpack, storage, and the actual administrative decisions of a given season are not modelled. Check the analog years listed: if they do not resemble this year to you, the outlook does not either.

Where it sits in line

Priority 1860-12-28 — 14th most senior of the 21886 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: 0203504 (1860-12-28). Immediately behind: DENVER FILTER PLT FLUME (1860-12-28).

On MAINSTEM at river mile 81.2, it is 546th of 890 down the reach. Immediately upstream: LUCKY JACK SPRING. Immediately downstream: ELK RIDGE LAND CO SPRG 2.

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
4015.00000 1860-12-281883-12-10 0.0 AF 0.0 1790.28 AF Irrigation, Municipal 20CW3200
4015.00000 1860-12-281883-12-10 0.0 cfs 0.0 6.5 cfs Irrigation, Municipal 20CW3200
4229.00000 1861-07-301883-12-10 4.7 cfs 0.0 4.7 cfs Irrigation, Municipal +1 CA3169, CA0973
4260.00000 1861-08-301883-12-10 0.0 AF 0.0 187.1 AF Municipal, Augmentation +1 90CW0172, 20CW3103
4260.00000 1861-08-301883-12-10 8.08 cfs 0.0 0.538 cfs Municipal, Augmentation +1 90CW0172, 20CW3103
4717.00000 1862-11-301883-12-10 0.0 cfs 0.0 2.4 cfs Irrigation, Municipal +6 86CW0014
5112.00000 1863-12-301883-12-10 24.5 cfs 0.0 24.5 cfs Municipal CA3169, CA0973
5478.00000 1864-12-301883-12-10 17.3 cfs 0.0 17.3 cfs Irrigation, Municipal +1 CA0973, CA3169
5843.00000 1865-12-301883-12-10 0.0 AF 0.0 225.9 AF Municipal, Augmentation +1 90CW0172, 20CW3103
5843.00000 1865-12-301883-12-10 0.82 cfs 0.0 0.66 cfs Municipal, Augmentation +1 90CW0172, 20CW3103
5965.00000 1866-05-011889-10-18 8.7 cfs 0.0 8.7 cfs Irrigation, Municipal +1 CA1974, CA3169
7659.00000 1870-12-201930-06-16 3.0 cfs 0.0 3.0 cfs Municipal CA0807, CA3169
9131.00000 1874-12-311930-06-16 3.78 cfs 0.0 3.78 cfs Municipal CA0807, CA3169
9252.00000 1875-05-011889-10-18 2.31 cfs 0.0 2.31 cfs Irrigation, Municipal +8 84CW0057, CA3169 +2
10480.00000 1878-09-101930-06-16 13.22 cfs 0.0 13.22 cfs Municipal CA3169, CA0807
10744.00000 1879-06-011889-10-18 3.65 cfs 0.0 3.65 cfs Municipal CA1942, CA3169
11139.00000 1880-06-301930-06-16 10.0 cfs 0.0 10.0 cfs Municipal CA0807, CA3169
11451.00000 1881-05-081889-10-18 1.71 cfs 0.0 1.71 cfs Municipal CA1936, CA3169
11809.00000 1882-05-011889-10-18 0.48 cfs 0.0 0.48 cfs Irrigation, Municipal +8 84CW0057, 88CW0262 +2
12924.00000 1885-05-201889-10-18 2.04 cfs 0.0 2.04 cfs Municipal, All beneficial uses CA1942, 88CW0263 +1
14519.00000 1889-10-011930-06-16 12.38 cfs 0.0 12.38 cfs Municipal CA3169, CA0807
15585.00000 1892-09-011930-06-16 25.33 cfs 0.0 25.33 cfs Municipal CA0807, CA3169
18018.00000 1899-05-011930-06-16 38.08 cfs 0.0 38.08 cfs Municipal CA0807, CA3169
19240.00000 1902-09-051930-06-16 63.0 cfs 0.0 63.0 cfs Storage CA3169, CA0807
22254.00000 1910-12-061930-06-16 42.72 cfs 0.0 42.72 cfs Municipal CA0807, CA3169
22370.00000 1911-04-011930-06-16 154.0 cfs 0.0 154.0 cfs Storage CA0807, CA3169
29386.26117 1921-07-041972-05-18 0.0 cfs 0.0 340.0 cfs Irrigation, Municipal +4 CA3635

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 439.8 cfs decreed rate, the average day over the last 6 year(s) had 231.719 cfs in priority (53% of the decree). No call in effect is a free river — that was 9.3% of days.

On 1476 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 32 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 124.28 cfs 28% 0 0
2025 133.47 cfs 30% 0 0
2024 250.5 cfs 57% 102 0
2023 272.7 cfs 62% 64 0
2022 137.04 cfs 31% 3 0
2021 252.11 cfs 57% 0 0
Show the last 120 days, day by day
DateIn priorityControlling call
2026-10-13 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-12 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-11 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-10 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-09 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-08 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-07 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-06 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-05 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-04 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-03 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-02 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-01 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-30 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-29 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-28 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-27 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-26 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-25 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-24 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-23 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-22 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-21 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-20 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-19 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-18 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-17 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-16 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-15 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-14 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-13 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-12 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-11 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-10 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-09 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-08 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-07 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-06 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-05 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-04 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-03 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-02 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-01 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-31 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-30 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-29 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-28 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-27 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-26 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-25 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-24 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-23 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-22 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-21 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-20 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-19 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-18 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-17 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-16 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-15 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-14 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-13 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-12 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-11 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-10 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-09 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-08 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-07 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-06 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-05 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-04 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-03 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-02 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-01 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-31 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-30 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-29 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-28 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-27 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-26 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-25 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-24 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-23 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-22 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-21 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-20 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-19 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-18 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-17 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-16 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-15 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-14 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-13 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-12 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-11 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-10 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-09 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-08 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-07 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-06 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-05 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-04 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-03 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-02 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-01 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-30 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-29 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-28 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-27 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-26 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-25 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-24 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-23 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-22 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-21 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-20 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-19 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-18 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-17 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-16 142.0 cfs (32%) HARMONY DITCH 1, 1897-05-03 · South Platte 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: 1574.

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 4015.00000 · never out of priority in these seasons
AprMayJunJulAugSep
middle right · admin 10744.00000 · peaks at 10 of 11 seasons
AprMayJunJulAugSep
most junior right · admin 29386.26117 · peaks at 10 of 11 seasons
AprMayJunJulAugSep
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 38,945 AF. Its most recent year on record, 2026, came in at 35,481 AF — 91% of that, and 6th 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)
2012 44,416 10th lowest of 15 · 114% of median — 366 194.0
2013 18,744 2nd lowest of 15 · 48% of median — 165 264.8
2014 7,578 1st lowest of 15 · 20% of median — 93 94.5
2015 51,233 13th lowest of 15 · 132% of median — 308 293.6
2016 30,572 4th lowest of 15 · 78% of median — 195 150.2
2017 38,945 8th lowest of 15 · 100% of median — 267 162.4
2018 44,494 11th lowest of 15 · 114% of median — 249 280.9
2019 55,901 14th lowest of 15 · 144% of median — 290 281.9
2020 34,975 5th lowest of 15 · 90% of median — 256 241.0
2021 35,606 7th lowest of 15 · 91% of median — 263 166.9
2022 50,727 12th lowest of 15 · 130% of median — 336 229.5
2023 28,818 3rd lowest of 15 · 74% of median — 365 261.0
2024 58,570 15th lowest of 15 · 150% of median — 366 201.0
2025 40,076 9th lowest of 15 · 103% of median — 365 177.0
2026 35,481 6th lowest of 15 · 91% of median — 287 190.0

Call-derived yield: senior right divertible 91.8% of a median season / 72.0% dry-year.

How good is our record of it?

Grade A (10/10 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 23153 measured days, newest -12 day(s) before the data's end (DWR publishes ~1 year in arrears)
record continuity continuous 100% of the irrigation seasons in 1919-2026 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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