Utah lake · state assessment record
Sevier Bridge Reservoir (Yuba Lake)
Assessment decisions reported by Utah to EPA under Clean Water Act sections 303(d) and 305(b), last assessed in the 2026 reporting cycle.
- 8,978
- Assessed acres
- Lake, Freshwater
- Water type
This waterbody in one line
Sevier Bridge Reservoir (Yuba Lake), a lake in Utah, is assessed as not supporting one or more designated uses, with one listed impairment cause in the state's most recent Integrated Report cycle (2026). By assessed acreage it sits among the largest 1% of assessed lakes nationally (38,628 lakes with a filed area); its impairment list is among the longest nationally (one listed cause vs 23,610 assessed lakes). Aquatic life is assessed as fully supporting.
- Not Supporting
- overall status
- P99
- Assessed size nationally
- P20
- Shorter cause list
- Fully Supporting
- aquatic life
Assessment verdicts are the state agency's decisions as reported to EPA ATTAINS; PlainLakes renders them without modification.
A composite of this record's EPA ATTAINS designated-use verdicts, filed impairment count, and assessment currency, weighted and benchmarked against the national corpus of assessed active waterbodies. This is a water-quality standing, not a human-recreation or property-value judgment, and dimensions with no filed verdict drop out rather than count against the score.
Sevier Bridge Reservoir (Yuba Lake) against the ATTAINS 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 Sevier Bridge Reservoir (Yuba Lake) nationally is assessed size: 8,978 acres, larger than 99% of the 38,628 lake-type units with an area on file.
The uses disagree
This record splits: Not Supporting on recreation, Fully Supporting on aquatic life. The divergence is inside the designated-use matrix, not a single all-or-nothing label.
Sevier Bridge Reservoir (Yuba Lake): Category 5, TMDL still owed
Category 5 is the Integrated Report band where a TMDL (or equivalent) is still expected for Sevier Bridge Reservoir (Yuba Lake). Read the listed causes and any cleanup actions filed beside them before treating the overall status tile as a finished restoration story.
Overall status: not supporting
The filer's overall status for Sevier Bridge Reservoir (Yuba Lake) is Not Supporting. That tile summarizes the assessment unit; the designated-use rows and cause list are the evidence behind it.
Typical cause-list length
1 listed cause is a middle-tercile list length among assessed lake-type units. Look to IR category and use outcomes for the distinctive reading.
According to the U.S. Environmental Protection Agency's ATTAINS program, Utah carries 143 filed lake-type waterbodies in the August 2026 extract, and this page renders the assessment record EPA assigned to Sevier Bridge Reservoir (Yuba Lake) without modification. See our methodology for reporting-unit limits and gauge linking rules.
The record
Designated-use assessments
Fully Supporting and Not Supporting are the state's definitive verdicts; other entries mean the use was not conclusively assessed in this cycle.
| Designated use | Group | Verdict |
|---|---|---|
| Agricultural | Other | Fully Supporting |
| Aquatic Wildlife (Warm Water) | Aquatic-life or related | Fully Supporting |
| Recreation and Aesthetics (Frequent Primary Contact) | Recreation | Not Supporting |
The record
Listed impairment causes
Causes the state listed as impairing designated uses of this lake, with the cycle each was first listed and the Clean Water Act action recorded against it.
| Cause | Affected uses | First listed | Cleanup standing |
|---|---|---|---|
| Harmful Algal Blooms | Recreation and Aesthetics (Frequent Primary Contact) | 2024 | TMDL priority: Low |
Probable sources
Utah listed the source of the impairment as unknown. That is the state's own filed value, not a gap in this record: the cause has been identified, the origin has not.
Reading the record
Where Sevier Bridge Reservoir (Yuba Lake) sits among peers
88% of Utah's lakes assessed this deeply also came out mixed
Utah ruled definitively on 3 designated uses at Sevier Bridge Reservoir (Yuba Lake) and found 1 of 3 not supported. The dataset shows 24 Utah lakes judged to that same depth.
Utah's assessed lakes are most often judged on 2 uses; this one was judged on 3.
Computed share from EPA ATTAINS filed records, not an official EPA rating or safety grade.
| 1 | 2 | 3 | 4 | 5+ | |
|---|---|---|---|---|---|
| All supported | 28 | 27 | 2 | 3 | 0 |
| Mixed | Not possible | 29 | 21 (this record) | 9 | 1 |
| None supported | 14 | 2 | 1 | 0 | 0 |
Ringed cell: Sevier Bridge Reservoir (Yuba Lake). Source: EPA ATTAINS, Reporting cycles 1987–2026.
Scale and rank
Sevier Bridge Reservoir (Yuba Lake) is one of 143 lake-type waterbodies reported to EPA from Utah, and one of 84 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 8,978 assessed acres it ranks 360th 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 359 lakes with a larger one.
Awaiting a filing
The state has not yet filed a definitive fish-consumption verdict for this record; that field populates when it reports it in a future Integrated Report cycle.
In context
Where Sevier Bridge Reservoir (Yuba Lake) 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
8,978 Top 1% larger than 99% 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
Listed causes vs waterbodies carrying a verdict
How many impairment causes U.S. waterbodies with a reported verdict carry
1 Longer than most more listed causes than 49% of 23,610 waterbodies carrying a verdict
named waterbodies carrying a verdict, 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 Sevier Bridge Reservoir (Yuba Lake). Hover or tap any bar for its full count and share.
In context
Utah context
ATTAINS carries 143 lake-type waterbodies in Utah, 77 assessed as not supporting at least one use and 60 fully supporting. Among the 84 indexed units there, Sevier Bridge Reservoir (Yuba Lake) ranks 56th by listed-cause count (one listed cause) and 7th by assessed size among the 84 with an area filed; it sits in the not-supporting set (77 statewide) . Its listed causes include Harmful Algal Blooms, which also appears among Utah's most-filed impairment causes (led by pH).
| Other large assessed lakes in Utah | Assessed acres |
|---|---|
| Gilbert Bay Fully Supporting | 559,424 |
| Gunnison Bay Not Assessed | 384,588 |
| Lake Powell Fully Supporting | 149,885 |
| Utah Lake other than Provo Bay Not Supporting | 87,984 |
| Farmington Bay Not Assessed | 77,243 |
| Bear River Bay Not Assessed | 71,681 |
Peers near Sevier Bridge Reservoir (Yuba Lake)'s size or cause load
Similar assessed acres
Nearest filed extents (8,978 acres here).
- Brassua L · 8,979 acres · ME
- Havasu, Lake · 8,998 acres · CA
- Blue Mesa Reservoir · 8,957 acres · CO
- Bull Shoals Lake · 9,000 acres · MO
Similar cause load
Nearest listed-cause counts (1 here). Peers already in the acreage column are omitted.
- Aaron · 1 causes · MN
- Aaron River Reservoir · 1 causes · MA
- Abbotts Creek (including Lexington-Thomasville Water Supply Reservoir at normal reservoir elevation, Tom-A-Lex Lake) · 1 causes · NC
- Abeniki Lake · 1 causes · NH
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 UT-L-16030003-007_00. 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.