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TWIN LAKES TUNNEL IN

Structure dossier · WDID 1104617 · DITCH · LAKE CREEK · DWR record

Twin Lakes Tunnel In is a ditch on Lake 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 2026-10-17 12:36 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.

Who owns it

DWR’s own records name no owner for a ditch, reservoir or well, so this comes from the source shown and can be out of date. Organisations only: a private landowner’s name is never listed.

The record and the river

This is water crossing the divide

Twin Lakes Tunnel in is the receiving end of the Twin Lakes Tunnel (tunnel). It takes water from Roaring Fork headwaters at Independence Pass (Div 5) and delivers it to Lake Creek to Twin Lakes, Arkansas basin (Div 2). Water arriving here is an import: it was never in this basin’s own runoff.

The other end: Ind P Tm Dvr Tunnel No 1 3804617

Metered as a facility: TWITUNCO — the record for the crossing itself, which may run longer than the record for either structure.

Owner / operator: Twin Lakes Reservoir & Canal Co.

From the site’s hand-curated register of transbasin facilities. Every crossing on one page →

Where this structure is measured

GageFlowing nowRecordHow we know
TWIN LAKES TUNNEL TWITUNCO 9.53 cfs 1935–2026, 33,295 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

9.53 cfs as of 2026-10-17 12:15 (0.4 h ago)

Provisional 15-minute telemetry from TWITUNCO ↗ (TWIN LAKES TUNNEL). 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

In a median year over its last 15 recorded years it diverts 4,580 acre-feet. That use is falling by about 1016.5 acre-feet a year over 15 years (p=0.022821503671488053).

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 (diversion). Faint dots are the neighbouring water; click any to open it.

Which of its rights are out of priority?

The outlook for the weeks ahead is not computable for this structure: no decreed right on file, so there is no priority to test.

Water-court filings naming this structure

1 application in the monthly water-court resumes explicitly reference this WDID. The resume is the earliest public notice of a new claim (C.R.S. 37-92-302) — years before anything reaches the decree record below. Most applications name structures by name rather than WDID, so absence here is weak evidence of absence.

MonthCaseWhat it asksOppose byExcerpt
2025-08 25CW3137 reasonable diligence closed 2025-10-31 25CW3137 PITKIN COUNTY. Application for Findings of Reasonable Diligence . Applicant: The Estate of Julia S. Marshall, c/o Sara M. Dunn & Andrea J. Hall, Balcomb & Green, P.C.; P.O. Drawer 790, Glenwood Springs, CO 81602…

Source: Judicial Branch combined monthly resumes (archive), indexed nightly; WDIDs attached only when a 7-digit token in the filing matches DWR’s structure inventory.

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 4,580 AF. Its most recent year on record, 2025, came in at 7,582 AF — 166% 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)
1982 54,902 14th lowest of 15 · 1199% of median — 365 567.0
1983 57,990 15th lowest of 15 · 1266% of median — 304 620.0
1985 1,664 7th lowest of 15 · 36% of median — 365 36.0
1986 49,039 13th lowest of 15 · 1071% of median — 212 608.0
2015 8,193 12th lowest of 15 · 179% of median 8,193 212 238.2
2016 4,580 8th lowest of 15 · 100% of median 4,580 243 213.6
2017 7,425 10th lowest of 15 · 162% of median 7,425 365 237.7
2018 6,702 9th lowest of 15 · 146% of median 6,702 153 105.4
2019 302 2nd lowest of 15 · 7% of median 302 61 45.1
2020 514 3rd lowest of 15 · 11% of median 514 223 64.6
2021 229 1st lowest of 15 · 5% of median 229 365 58.4
2022 1,246 5th lowest of 15 · 27% of median 1,246 365 117.5
2023 1,302 6th lowest of 15 · 28% of median 1,302 365 127.6
2024 1,014 4th lowest of 15 · 22% of median 1,014 366 60.5
2025 7,582 11th lowest of 15 · 166% of median 7,582 304 109.1

How good is our record of it?

Grade C (6/10 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 7555 measured days; currency unknown (no data-coverage date to compare against)
record continuity patchy 63% of the irrigation seasons in 1970-2025 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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