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CBT ALVA B ADAMS TUNNEL
Structure dossier · WDID 5104634 · 7 · EAST INLET · DWR record
Where this page's figures come from
Generated 2026-08-27 19:54 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (2deb1d7) — every figure regenerates from this named code version and data image.
Where it sits in line
Priority 1935-08-01 — 428th most senior of the 2208 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: CBT GRANBY RESERVOIR (1935-08-01). Immediately behind: HAMILTON-CABIN CREEK DITCH (1932-07-02).
Decreed rights (1)
| 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. | Units | UsesWhat the court said this water may be used for -- irrigation, municipal supply, augmentation and so on. | Case |
|---|---|---|---|---|---|---|---|
| 31258.0 | 1935-08-01 | 1955-10-12 | 550.0 | 0.0 | C | IRRINDREC |
Recorded use (last 15 years on record)
In a median year this structure has a recorded diversion of 214,797 AF. Its most recent year on record, 2024, came in at 200,750 AF — 94% of that, and 4th lowest of the 15 years with a recorded volume.
| 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 | Days recorded | Peak (cfs) |
|---|---|---|---|---|
| 2010 | 202,323 | 5th lowest of 15 · 94% of median | 365 | 552.0 |
| 2011 | 263,849 | 12th lowest of 15 · 123% of median | 365 | 565.0 |
| 2012 | 302,218 | 15th lowest of 15 · 141% of median | 366 | 564.0 |
| 2013 | 193,302 | 3rd lowest of 15 · 90% of median | 365 | 565.0 |
| 2014 | 210,177 | 6th lowest of 15 · 98% of median | 365 | 555.0 |
| 2015 | 132,031 | 1st lowest of 15 · 62% of median | 365 | 550.0 |
| 2016 | 245,234 | 10th lowest of 15 · 114% of median | 366 | 557.0 |
| 2017 | 214,797 | 8th lowest of 15 · 100% of median | 365 | 549.0 |
| 2018 | 268,559 | 13th lowest of 15 · 125% of median | 365 | 557.0 |
| 2019 | 276,687 | 14th lowest of 15 · 129% of median | 335 | 666.9 |
| 2020 | 211,560 | 7th lowest of 15 · 98% of median | 366 | 625.5 |
| 2021 | 252,807 | 11th lowest of 15 · 118% of median | 365 | 553.6 |
| 2022 | 175,673 | 2nd lowest of 15 · 82% of median | 365 | 551.0 |
| 2023 | 239,359 | 9th lowest of 15 · 111% of median | 365 | 552.2 |
| 2024 | 200,750 | 4th lowest of 15 · 94% of median | 305 | 553.1 |
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.