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THORNTON AUG IMPACT REACH 2

Structure dossier · WDID 0202235 · REACH (AGGREGATING) · SOUTH PLATTE RIVER · DWR record · probably THORNTON CITY OF’s (matched on DWR’s contact or an EPA intake name; verify below)

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 2026-09-13 08:40 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (956f090) — every figure regenerates from this named code version and data image.

In short

In a median year over its last 14 recorded years it diverts 1,345 acre-feet. That use is rising by about 454.5 acre-feet a year over 14 years (p=0.01600615515316317).

Assembled from the figures on this page — every number above is checked against them before it is shown (5 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 (instream). Faint dots are the neighbouring water; click any to open it.

Which of its rights are out of priority?

Not computable for this structure: no decreed right on file, so there is no priority to test.

Recorded use (last 14 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 1,345 AF. Its most recent year on record, 2025, came in at 6,943 AF — 516% of that, and 11th lowest of the 14 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 704 7th lowest of 14 · 52% of median — 245 3.3
2013 453 6th lowest of 14 · 34% of median — 281 1.4
2014 168 2nd lowest of 14 · 12% of median — 63 1.5
2015 145 1st lowest of 14 · 11% of median 62 74 1.7
2016 284 4th lowest of 14 · 21% of median 1,201 183 1.3
2017 202 3rd lowest of 14 · 15% of median 5,599 228 1.3
2018 1,986 8th lowest of 14 · 148% of median 1,559 250 16.4
2019 9,107 12th lowest of 14 · 677% of median 5,260 304 17.4
2020 323 5th lowest of 14 · 24% of median 6,937 231 2.1
2021 2,299 9th lowest of 14 · 171% of median 7,244 321 18.2
2022 10,790 14th lowest of 14 · 802% of median 9,472 365 17.4
2023 10,317 13th lowest of 14 · 767% of median 6,582 365 31.4
2024 3,931 10th lowest of 14 · 292% of median 6,142 366 16.3
2025 6,943 11th lowest of 14 · 516% of median 6,553 304 13.2

How good is our record of it?

Grade B (7/10 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 absent no water rights cached for this WDID
diversion record present 3580 measured days; currency unknown (no data-coverage date to compare against)
record continuity continuous 100% of the irrigation seasons in 2012-2025 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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