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CASCADE RESERVOIR

Structure dossier · WDID 3003536 · RESERVOIR · ELBERT CREEK · DWR record

Cascade Reservoir is a reservoir on Elbert 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 2026-10-22 04:06 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260928 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (71f534c) — 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
CASCADE RESERVOIR CASRESCO — — co-located, 1 m
ELBERT CREEK BELOW CASCADE RESERVOIR ELBCASCO — 2000–2026, 9,461 days co-located, 70 m

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.

In short

CASCADE RESERVOIR holds 2 decreed rights on ELBERT CREEK. No call currently reaches it that we can lawfully attribute, so none of its rights are being curtailed by one. 3 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 395 acre-feet.

Assembled from the figures on this page — every number above is checked against them before it is shown (4 checked). The detail, with its method, is in the cards below.

Download this structure

Everything on this page as data you can work with — and a README that makes it citable: the HydroBase snapshot it was built from, the build commit, what every column means, the method behind each derived figure, and that method's stated limits.

⇩ Full record (.zip) Print / save as PDF

Or one table at a time: rights.csv · annual_use.csv · curtailment_now.csv · court_cases.csv · co_parties.csv · call_climatology.csv

What is in the bundle
  • rights.csv — every decreed right, most senior first, with admin numbers, dates, amounts, uses and case numbers.
  • annual_use.csv — recorded diversion by year, with releases accounted separately.
  • curtailment_now.csv — each right's current priority status and how often it was out across analog years.
  • court_cases.csv — the cases attached to its rights.
  • co_parties.csv — the other structures that were parties to those cases. Not available anywhere else.
  • call_climatology.csv — how often each right has been out of priority by week of season, with confidence intervals and the seasons the record could actually judge.
  • README.txt — provenance, methods, limits, disclaimer, and links back to DWR's own records for verification.

Where it sits

Location as DWR records it (storage). Faint dots are the neighbouring water; click any to open it.

Dam safety

Dam CASCADE #3 (completed 1902)
Hazard class Low
Condition at last inspection Conditionally Satisfactory (2008-08-21)
Storage restriction None on file
Normal storage 25 AF
Physical status Active
Emergency action plan Not Required

Source: DWR Dam Safety’s jurisdictional-dam inventory (damsafety/damsafetydaminfojd), refreshed weekly. Joined on this structure’s own WDID as DWR records it on the dam. Hazard class describes the consequence of failure, not the likelihood of it. DWR’s dam record.

Current administration

● In priority — no active call senior to this structure's rights affects its district (3 active call(s) checked).

3 further calls state no district and sit outside this one, so they are counted here rather than assumed either way.

Which of its rights are out of priority?

No active call verifiably reaches this structure (3 active call(s) checked), so none of its 2 rights is administratively curtailed today. (3 call(s) state no district and sit outside this one — not judged, not assumed.) In the 5 past years most like this one (2007, 2015, 2014, 2017, 2013), 2 of the rights shown below were out at least one week in at least one analog year.

Right (priority)NowAnalog years outMajority out by
1902-10-02 26974 — 3 of 5 2026-09-27
1978-03-10 46820 — 3 of 5 2026-09-27
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 ELBERT CREEK BELOW CASCADE RESERVOIR around 2026-09-27 (the newest reading on file) — currently 151% of that gage's own median for this window — to pick the 5 most similar past years with complete administration records (2004–2025). 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 1902-10-02 — 475th most senior of the 2278 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: POWER CANAL NO 1 (1902-10-02). Immediately behind: CASCADE RESERVOIR NO 3 (1902-10-02).

On ELBERT CREEK at river mile 6.3, it is 66th of 145 down the reach. Immediately upstream: PERMISON RESERVOIR #2. Immediately downstream: POWER CANAL NO 1.

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 (2)

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
26974.19267 1902-10-021966-03-21 23254.0 AF 0.0 — Storage, Irrigation +3 65-2
46820.00000 1978-03-101978-12-31 0.0 AF 22000.0 AF — Irrigation, Industrial +2 W1896

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 often is it out of priority?

Across the 1 season whose call record is complete enough to judge this structure (2004), week by week from April. Read these as counts, not rates — 1 seasons is a short record.

most senior right · admin 26974.19267 · never out of priority in these seasons
AprMayJunJulAugSep
most junior right · admin 46820.00000 · never out of priority in these seasons
AprMayJunJulAugSep
Why only 1 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 — 22 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 395 AF. Its most recent year on record, 2018, came in at 4,041 AF — 1023% of that, and 11th 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)
2004 112 7th lowest of 15 · 28% of median 602 185 0.7
2005 0 1st lowest of 15 · 0% of median 182 1 0.0
2006 105 6th lowest of 15 · 27% of median 220 128 0.4
2007 98 4th lowest of 15 · 25% of median 301 154 0.4
2008 21 2nd lowest of 15 · 5% of median 320 83 0.2
2009 62 3rd lowest of 15 · 16% of median 361 85 0.4
2010 98 4th lowest of 15 · 25% of median 2,976 188 0.5
2011 9,708 14th lowest of 15 · 2458% of median 15,498 365 186.8
2012 8,753 13th lowest of 15 · 2216% of median 11,088 366 158.1
2013 395 8th lowest of 15 · 100% of median 9,601 303 4.5
2014 3,560 10th lowest of 15 · 901% of median 278 304 110.6
2015 11,868 15th lowest of 15 · 3005% of median 678 365 88.8
2016 738 9th lowest of 15 · 187% of median 5,207 305 28.0
2017 6,135 12th lowest of 15 · 1553% of median 6,869 365 61.0
2018 4,041 11th lowest of 15 · 1023% of median 4,410 273 121.2

How good is our record of it?

Grade B (8/10 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 2 right(s), seniority decoded
diversion record stale 6629 measured days, but newest is 2888 day(s) before the data's end (target 450)
record continuity patchy 72% of the irrigation seasons in 1975-2018 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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