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NIELSEN PONDS NO 1
Structure dossier · WDID 0603982 · RESERVOIR · BOULDER CREEK · DWR record
Where this page's figures come from
Generated 2026-08-27 19:49 by Hydrohistorian. Sources: DWR HydroBase snapshot HydroBase_CO_20260707 (history) + CDSS REST (current), USGS NWIS cross-checks. Engine v0.5.0 (e70d0b5) — every figure regenerates from this named code version and data image.
Where it sits in line
Priority 1981-12-10 — 1645th 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: 0606145 (1981-09-29). Immediately behind: NIELSEN PONDS NO 2 (1981-12-10).
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 |
|---|---|---|---|---|---|---|---|
| 48212.48191 | 1981-12-10 | 1982-12-31 | 16.5 | 0.0 | A | COMRECFISDOM |
Recorded use (last 5 years on record)
In a median year this structure has a recorded diversion of 24 AF. Its most recent year on record, 2023, came in at 67 AF — 279% of that, and 5th lowest of the 5 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) |
|---|---|---|---|---|
| 2008 | 32 | 4th lowest of 5 · 133% of median | 17 | 4.0 |
| 2009 | 24 | 3rd lowest of 5 · 100% of median | 13 | 3.0 |
| 2020 | 15 | 2nd lowest of 5 · 62% of median | 7 | 1.2 |
| 2021 | 9 | 1st lowest of 5 · 38% of median | 12 | 0.7 |
| 2023 | 67 | 5th lowest of 5 · 279% of median | 29 | 2.0 |
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.