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LAST CHANCE DITCH 2

Structure dossier · WDID 0801007 · DITCH · SOUTH PLATTE RIVER · DWR record

Last Chance Ditch 2 is a ditch 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 14:50 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

LAST CHANCE DITCH 2 holds 14 decreed rights on SOUTH PLATTE RIVER. As of 2026-10-02, 5 of them are out of priority under a call at admin 17332.00000 placed by SOUTH PLATTE RIVER COMPACT. Its 9 most senior rights, back to 1862-11-30, keep diverting. 5 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 3,539 acre-feet. It was a party to 20 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 LITTLETON BOAT CHUTE NO 10 (SOUTH PLATTE RIVER, priority 1994-12-02).

● Junior rights called out — call at SOUTH PLATTE RIVER COMPACT (SOUTH PLATTE RIVER, priority 1897-06-13).

● 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 COMPACT, priority 1897-06-13): 5 of this structure's 14 rights are out of priority now. (5 call(s) state no district and sit outside this one — not judged, not assumed.) In the 5 past years most like this one (2015, 2025, 2023, 2017, 2024), 5 of the rights shown below were out at least one week in at least one analog year.

Right (priority)NowAnalog years outMajority out by
1862-11-30 4717 ● in priority 0 of 5 —
1863-05-01 4869 ● in priority 0 of 5 —
1863-12-30 5112 ● in priority 0 of 5 —
1865-12-30 5843 ● in priority 0 of 5 —
1868-03-03 6637 ● in priority 0 of 5 —
1870-12-30 7669 ● in priority 0 of 5 —
1878-05-01 10348 ● in priority 0 of 5 —
1880-07-31 11170 ● in priority 0 of 5 —
1881-04-01 11414 ● in priority 0 of 5 —
1984-09-07 49193 ● out 4 of 5 2026-10-02
1988-12-21 50759 ● out 4 of 5 2026-10-02
1985-10-17 52230 ● out 4 of 5 2026-10-02
1995-11-28 53292 ● out 4 of 5 2026-10-02
2019-12-31 62091 ● out 4 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 COLORADO PARKS AND WILDLIFE CHATFIELD FISH HATCHERY around 2026-10-02 (the newest reading on file) — currently 179% 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 1862-11-30 — 98th 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: HARTSEL RANCH CLAIM (1862-11-01). Immediately behind: BROWN DITCH (1862-11-30).

On MAINSTEM at river mile 90.0, it is 640th of 890 down the reach. Immediately upstream: NEVADA DITCH. Immediately downstream: CHATFIELD FISH UNIT.

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 (20)

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
4717.00000 1862-11-301883-12-10 0.0 cfs 0.0 2.4 cfs Irrigation, Municipal +6 86CW0014
4869.00000 1863-05-011913-05-22 0.0 AF 0.0 18.7 AF Irrigation, Municipal +8 18CW3188, 07CW0062
4869.00000 1863-05-011913-05-22 0.0 cfs 0.0 0.498 cfs Irrigation, Municipal +8 18CW3188, 07CW0062
5112.00000 1863-12-301883-12-10 1.6224 cfs 0.0 — Irrigation, Domestic +1 91CW0117, 92CW0014 +2
5843.00000 1865-12-301883-12-10 0.1 AF 0.0 — Irrigation, Augmentation W1686, W8521 +3
5843.00000 1865-12-301883-12-10 0.1536 cfs 0.0 — Irrigation, Augmentation W1686, W8521 +3
6637.00000 1868-03-031883-12-10 10.2 AF 0.0 — Irrigation, Domestic +1 12/10/1883, 02CW0360 +5
6637.00000 1868-03-031883-12-10 5.4766 cfs 0.0 — Irrigation, Domestic +1 12/10/1883, 02CW0360 +5
7669.00000 1870-12-301883-12-10 0.0 cfs 0.0 5.0 cfs Storage, Irrigation +4 93CW0177
10348.00000 1878-05-011889-10-18 0.0 AF 0.0 1724.0 AF Irrigation, Municipal +8 05CW0111
10348.00000 1878-05-011889-10-18 0.0 cfs 0.0 11.75 cfs Irrigation, Municipal +8 05CW0111
11170.00000 1880-07-311889-10-18 0.0 AF 0.0 185.0 AF Irrigation, Municipal +8 05CW0111
11170.00000 1880-07-311889-10-18 0.0 cfs 0.0 1.15 cfs Irrigation, Municipal +8 05CW0111
11414.00000 1881-04-011889-10-18 0.0 AF 0.0 2134.0 AF Irrigation, Municipal +8 05CW0111
11414.00000 1881-04-011889-10-18 0.0 cfs 0.0 11.75 cfs Irrigation, Municipal +8 05CW0111
49193.00000 1984-09-071984-12-31 0.0 cfs 0.0 75.0 cfs Storage 93CW0082, 21CW3183
50759.00000 1988-12-211988-12-31 0.0 cfs 0.0 59.63 cfs Storage, Irrigation +6 12CW0184, 93CW0179
52230.49598 1985-10-171993-12-31 0.0 cfs 0.0 137.1 cfs Irrigation, Municipal +8 11CW0244, 93CW0178
53292.00000 1995-11-281995-12-31 57.0 cfs 0.0 — Storage 20CW3078, 12CW0199 +1
62091.00000 2019-12-312019-12-31 0.0 cfs 0.0 13.1 cfs Municipal 19CW3257

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 64.253 cfs decreed rate, the average day over the last 6 year(s) had 13.637 cfs in priority (21% of the decree). No call in effect is a free river — that was 9.4% of days.

On 1637 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 34 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 7.23 cfs 11% 0 0
2025 7.14 cfs 11% 0 0
2024 19.4 cfs 30% 102 0
2023 26.86 cfs 42% 64 0
2022 8.71 cfs 14% 6 0
2021 7.25 cfs 11% 0 0
Show the last 120 days, day by day
DateIn priorityControlling call
2026-10-13 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-12 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-11 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-10 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-09 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-08 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-07 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-06 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-05 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-04 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-03 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-02 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-10-01 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-30 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-29 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-28 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-27 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-26 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-25 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-24 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-23 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-22 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-21 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-20 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-19 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-18 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-17 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-16 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-15 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-14 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-13 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-12 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-11 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-10 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-09 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-08 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-07 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-06 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-05 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-04 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-03 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-02 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-09-01 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-31 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-30 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-29 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-28 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-27 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-26 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-25 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-24 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-23 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-22 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-21 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-20 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-19 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-18 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-17 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-16 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-15 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-14 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-13 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-12 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-11 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-10 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-09 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-08 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-07 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-06 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-05 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-04 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-03 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-02 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-08-01 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-31 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-30 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-29 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-28 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-27 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-26 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-25 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-24 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-23 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-22 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-21 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-20 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-19 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-18 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-17 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-16 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-15 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-14 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-13 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-12 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-11 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-10 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-09 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-08 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-07 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-06 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-05 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-04 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-03 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-02 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-07-01 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-30 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-29 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-28 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-27 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-26 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-25 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-24 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-23 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-22 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-21 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-20 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-19 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-18 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-17 7.253 cfs (11%) HARMONY DITCH 1, 1897-05-03 · South Platte River · same source, at or above the calling point
2026-06-16 7.253 cfs (11%) 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: 1534.

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 4717.00000 · never out of priority in these seasons
AprMayJunJulAugSep
middle right · admin 11170.00000 · peaks at 10 of 11 seasons
AprMayJunJulAugSep
most junior right · admin 62091.00000 · 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 3,539 AF. Its most recent year on record, 2026, came in at 0 AF — 0% 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)
2007 1,430 3rd lowest of 15 · 40% of median 190 8.0
2008 8,095 14th lowest of 15 · 229% of median 289 36.7
2009 7,982 13th lowest of 15 · 226% of median 345 41.8
2010 9,040 15th lowest of 15 · 255% of median 304 40.6
2016 226 2nd lowest of 15 · 6% of median 61 2.0
2017 3,539 8th lowest of 15 · 100% of median 365 10.9
2018 3,044 7th lowest of 15 · 86% of median 312 14.8
2019 2,672 4th lowest of 15 · 76% of median 202 26.3
2020 2,867 5th lowest of 15 · 81% of median 248 17.6
2021 2,982 6th lowest of 15 · 84% of median 271 14.7
2022 4,897 11th lowest of 15 · 138% of median 275 23.9
2023 3,559 9th lowest of 15 · 101% of median 365 29.4
2024 5,299 12th lowest of 15 · 150% of median 366 30.3
2025 4,771 10th lowest of 15 · 135% of median 365 25.4
2026 0 1st lowest of 15 · 0% of median 287 0.0

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 20 right(s), seniority decoded
diversion record current 15036 measured days, newest -12 day(s) before the data's end (DWR publishes ~1 year in arrears)
record continuity continuous 91% of the irrigation seasons in 1949-2026 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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