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KOSSLER RES
Structure dossier · WDID 0604179 · RESERVOIR · MIDDLE BOULDER CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 21:28 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (96d5528) — every figure regenerates from this named code version and data image.
Where it sits
Location as DWR records it. 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 administrative call record for this basin.
Where it sits in line
Priority 1906-11-17 — 191st most senior of the 1867 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: 0605172 (1906-11-02). Immediately behind: 0604233 (1906-12-18).
On MIDDLE BOULDER CREEK at river mile -6.1, it is 4th of 4 down the reach. Immediately upstream: BOULDER PL 3 AT BARKER R. Nothing modelled downstream of it on this reach.
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 (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 |
|---|---|---|---|---|---|---|---|
| 20774.0 | 1906-11-17 | 1909-11-03 | 128.9 | 0.0 | A | IND |
Recorded use (last 8 years on record)
In a median year this structure has a recorded diversion of 137 AF. Its most recent year on record, 2025, came in at 81 AF — 59% of that, and 2nd lowest of the 8 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) |
|---|---|---|---|---|
| 2016 | 29 | 1st lowest of 8 · 21% of median | 15 | 3.0 |
| 2017 | 198 | 8th lowest of 8 · 144% of median | 84 | 5.1 |
| 2018 | 139 | 5th lowest of 8 · 102% of median | 65 | 3.7 |
| 2020 | 135 | 4th lowest of 8 · 98% of median | 120 | 4.3 |
| 2021 | 170 | 6th lowest of 8 · 124% of median | 224 | 6.6 |
| 2022 | 119 | 3rd lowest of 8 · 87% of median | 142 | 5.7 |
| 2023 | 172 | 7th lowest of 8 · 126% of median | 192 | 4.5 |
| 2025 | 81 | 2nd lowest of 8 · 59% of median | 79 | 2.2 |
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.