Hydrohistorian
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· every download of this record carries its certificate idECCV AUG SOUTH PLATTE WESTERN TO LATHAM IMPACT REA
Structure dossier · WDID 0202294 · REACH (AGGREGATING) · SOUTH PLATTE RIVER · DWR record · probably EAST CHERRY CREEK VALLEY WSD, CHERRY CREEK VALLEY WSD’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 2026-09-11 09:17 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (fea6c6b) — every figure regenerates from this named code version and data image.
Where this structure is measured
| Gage | Flowing now | Record | How we know |
|---|---|---|---|
| LOWER LATHAM AUGMENTATION BYPASS LLABYPCO | 10.29 cfs | 2008–2026, 5,929 days | co-located, 27 m |
| LOWER LATHAM BYPASS NO 2 LLABY2CO | 22.86 cfs | 2016–2026, 3,672 days | co-located, 76 m |
| LOWER LATHAM DITCH LLADIVCO | 95.67 cfs | 2008–2026, 6,407 days | co-located, 102 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
In a median year over its last 5 recorded years it diverts 108 acre-feet.
Assembled from the figures on this page — every number above is checked against them before it is shown (2 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.
Filings that would move water above this headgate
2 water-court applications in the monthly resumes name 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.
| Month | Case | What it asks | Upstream structures | Oppose by |
|---|---|---|---|---|
| 2025-10 | 2025CW3141 |
plan for augmentation | WESTERN D CENTRAL GMS AUG RT (11.5 mi up) | 2025-12-31 |
| 2024-12 | 2024CW3183 |
— | MEADOW ISLAND 1 DITCH (27.8 mi up), LUPTON BOTTOM DITCH (35.8 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.
Recorded use (last 5 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 108 AF. Its most recent year on record, 2025, came in at 62 AF — 57% of that, and 2nd lowest of the 5 years with a recorded volume.
This structure records both diversions and reservoir releases — they are separate water movements and are accounted separately below.
| Year | Diverted (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 record | Released (AF) | Days recorded | Peak (cfs) |
|---|---|---|---|---|---|
| 2021 | 108 | 3rd lowest of 5 · 100% of median | 319 | 34 | 2.3 |
| 2022 | 144 | 4th lowest of 5 · 133% of median | 243 | 76 | 2.7 |
| 2023 | 308 | 5th lowest of 5 · 285% of median | 271 | 275 | 2.1 |
| 2024 | 52 | 1st lowest of 5 · 48% of median | 396 | 366 | 0.6 |
| 2025 | 62 | 2nd lowest of 5 · 57% of median | 646 | 304 | 0.5 |
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
| Check | State | Detail |
|---|---|---|
| identity | complete | name, type, and water source all on file |
| decreed rights | absent | no water rights cached for this WDID |
| diversion record | present | 1055 measured days; currency unknown (no data-coverage date to compare against) |
| record continuity | continuous | 100% of the irrigation seasons in 2021-2025 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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