California reservoir · state assessment record
Ash Creek Wildlife Area (Lassen and Modoc Counties)
The assessment record reported by California to EPA under Clean Water Act sections 303(d) and 305(b).
- 2,876
- Assessed acres
- Lake / Reservoir / Pond
- Water type
This waterbody in one line
Ash Creek Wildlife Area (Lassen and Modoc Counties), a reservoir in California, has no overall assessment verdict in the state's most recent Integrated Report. By assessed acreage it sits among the largest 5% by assessed acreage nationally (38,628 lakes).
- Not reported
- overall status
- P97
- Assessed size nationally
Assessment verdicts are the state agency's decisions as reported to EPA ATTAINS; PlainLakes renders them without modification.
How Ash Creek Wildlife Area (Lassen and Modoc Counties) reads against the filed register
Paragraphs are selected by this unit's percentiles and use matrix: different lakes lead with different dimensions. Figures are ATTAINS / portal register arithmetic, not advice.
The signature stat: assessed size
The number that most separates Ash Creek Wildlife Area (Lassen and Modoc Counties) nationally is assessed size: 2,876 acres, larger than 97% of the 38,628 lake-type units with an area on file.
According to the U.S. Environmental Protection Agency's ATTAINS program, California carries 607 filed lake-type waterbodies in the August 2026 extract, and this page renders the assessment record EPA assigned to Ash Creek Wildlife Area (Lassen and Modoc Counties) without modification. See our methodology for reporting-unit limits and gauge linking rules.
The record
Listed impairment causes
No causes are listed because this reservoir has no overall assessment verdict in the reported cycle. An unassessed waterbody is neither confirmed clean nor confirmed impaired.
Reading the record
What Ash Creek Wildlife Area (Lassen and Modoc Counties)'s record holds
Scale and rank
Ash Creek Wildlife Area (Lassen and Modoc Counties) is one of 607 lake-type waterbodies reported to EPA from California. It is not among the 195 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 2,876 assessed acres it ranks 1,028th by assessed size among the 38,628 lakes the dataset carries an area for, counting a state’s repeated filings of one water once, behind 1,027 lakes with a larger one.
Which uses were judged
California filed no use-level rows for this reservoir and reached no overall verdict, so nothing here was judged either way.
What this record holds
California filed no overall verdict, no reporting cycle and no EPA category for this reservoir, so the record holds the identifying fields above and no judgement of any kind: no verdict, and no impairment cause to track over time. The state has not yet filed a definitive fish-consumption verdict, a definitive recreation verdict, a definitive aquatic-life verdict, and 1 other for this record; those fields populate when it reports them in a future Integrated Report cycle.
In context
Where Ash Creek Wildlife Area (Lassen and Modoc Counties) sits nationally
Assessed size among U.S. lakes
Distribution of assessed acreage across ATTAINS lakes filed with an area, counting a state’s repeated filings of one water once
2,876 Top 3% larger than 97% of 38,628 lakes
lakes the dataset carries an area for, counting a state’s repeated filings of one water once, bucketed by value
Source EPA ATTAINS · Reporting cycles 1987–2026
In both charts each bar is a band and taller bars hold more waterbodies; the dashed line and filled bar mark Ash Creek Wildlife Area (Lassen and Modoc Counties). Hover or tap any bar for its full count and share.
In context
California context
ATTAINS carries 607 lake-type waterbodies in California, 202 assessed as not supporting at least one use and 22 fully supporting.
| Other large assessed lakes in California | Assessed acres |
|---|---|
| Salton Sea Not Supporting | 233,045 |
| Tahoe, Lake Not Supporting | 84,092 |
| Goose Lake (Modoc County) Not reported | 62,385 |
| Honey Lake Not Supporting | 55,526 |
| Klamath River HU, Tule Lake and Lower Klamath Lake National Wildlife Refuge Not Supporting | 48,791 |
| Mono Lake Not Supporting | 45,299 |
Lakes near Ash Creek Wildlife Area (Lassen and Modoc Counties)'s assessed acres
Similar assessed acres
Nearest filed extents (2,876 acres here).
- Lake Livingston · 2,875 acres · TX
- Twin Lakes (North) · 2,871 acres · WI
- St. John River at Oullette Brook · 2,866 acres · ME
- Council Grove Lake · 2,860 acres · KS
What to do with this record
- Assessment verdicts are cycle-based, not real-time. For fish-consumption decisions, your state advisory program is the binding source. Consumption status guide
- Impairment listings follow the Clean Water Act 303(d) process; a listing is a regulatory finding, not a closure notice. 303(d) explained
PlainLakes renders state assessment decisions and federal gauge observations without modification. It does not issue advisories.
Assessment decisions on this page are rendered directly from state Integrated Report records in EPA's ATTAINS system; gauge figures are daily-value observations from the USGS National Water Information System, no number is typed in by an editor. Overall status, use verdicts, and causes are the state's reported decisions for assessment unit CAL5266108020200728034366. Counts and percentiles are computed across all lake-type records PlainLakes ingests from ATTAINS. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-08-17. Primary sources: EPA ATTAINS and USGS National Water Information System.