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AURORA EVERIST RESERVOIR 1

Structure dossier · WDID 0203087 · RESERVOIR SYSTEM · SOUTH PLATTE RIVER · DWR record · probably AURORA CITY OF’s (matched on DWR’s contact or an EPA intake name; verify below)

Aurora Everist Reservoir 1 is a water structure 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 15:55 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
LUPTON EAST GOLDEN DELIVERY TO AURORA EVERIST RESERVOIR 1 0203087B 0.04 cfs 2024–2026, 585 days DWR telemetry mapping
AURORA EVERIST RESERVOIR 1 OUTLET EV1OUTCO 0.0 cfs 2019–2026, 2,401 days DWR telemetry mapping
HILL OAKLEY INLET TO AURORA EVERIST RESERVOIR 1 0203087C 0.01 cfs 2024–2026, 520 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

0.04 cfs as of 2026-10-14 14:15 (1.7 h ago)

Provisional 15-minute telemetry from 0203087B ↗ (LUPTON EAST GOLDEN DELIVERY TO AURORA EVERIST RESERVOIR 1). 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

AURORA EVERIST RESERVOIR 1 holds 2 decreed rights on SOUTH PLATTE RIVER. A call at SOUTH PLATTE RIVER COMPACT on SOUTH PLATTE RIVER (1897-06-13), and 1 other currently reaches it: junior rights called out. 5 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 9 recorded years it diverts 423 acre-feet. It was a party to 3 court cases that also touched 21 other structures.

Assembled from the figures on this page — every number above is checked against them before it is shown (9 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.

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 STERLING IRR CO DITCH 1 (SOUTH PLATTE RIVER, priority 1901-02-16).

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 1873-09-15 — 429th 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: 0203058 (1873-09-15). Immediately behind: 0203410 (1873-09-15).

On MAINSTEM at river mile 140.3, it is 830th of 890 down the reach. Immediately upstream: LUPTON BOTTOM D WEST LATERAL AUG RETURN. Immediately downstream: PLATTEVILLE D CENTRAL AUG RT.

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
8659.00000 1873-09-151883-04-28 0.0 cfs 0.0 1.4071 cfs Municipal 18CW3038
57395.00000 2007-02-212002-12-31 0.0 AF 7000.0 AF — Municipal 02CW0330

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.

Filings that would move water above this headgate

1 water-court application in the monthly resumes names a structure on SOUTH PLATTE RIVER upstream of this headgate. A new right, exchange or change of use up there changes what arrives down here — the resume is the public notice, and the opposition window is how anyone affected answers it.

MonthCaseWhat it asksUpstream structuresOppose by
2024-12 2024CW3183 — LUPTON BOTTOM DITCH (6.6 mi up) 2025-02-28

Judged on this structure’s own named stream only — a filing on a tributary that joins upstream is not judged here. Filings that name structures only in prose, without a WDID, are invisible to this card. Reading aid, not legal advice; the deadline is computed from C.R.S. 37-92-302(3), and the court’s own notice controls.

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 8659.00000 · peaks at 8 of 11 seasons
AprMayJunJulAugSep
most junior right · admin 57395.00000 · 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 9 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 423 AF. Its most recent year on record, 2025, came in at 237 AF — 56% of that, and 4th lowest of the 9 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)
2016 584 6th lowest of 9 · 138% of median 111 3.6
2018 423 5th lowest of 9 · 100% of median 92 4.6
2019 781 9th lowest of 9 · 185% of median 115 4.6
2020 748 8th lowest of 9 · 177% of median 206 4.0
2021 0 1st lowest of 9 · 0% of median 1 0.0
2022 0 1st lowest of 9 · 0% of median 61 0.0
2023 173 3rd lowest of 9 · 41% of median 304 6.0
2024 666 7th lowest of 9 · 157% of median 188 3.8
2025 237 4th lowest of 9 · 56% of median 304 3.3

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 2 right(s), seniority decoded
diversion record current 1382 measured days, newest 336 day(s) before the data's end (DWR publishes ~1 year in arrears)
record continuity patchy 68% of the irrigation seasons in 2016-2025 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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