Nevada reservoir · state assessment record
Lake Mohave
Assessment decisions reported by Nevada to EPA under Clean Water Act sections 303(d) and 305(b), last assessed in the 2022 reporting cycle.
- 27,001
- Assessed acres
- Reservoir
- Water type
This waterbody in one line
Lake Mohave, a reservoir in Nevada, is assessed as not supporting one or more designated uses, with one listed impairment cause in the state's most recent Integrated Report cycle (2022). 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 not supporting.
- Not Supporting
- overall status
- P100
- Assessed size nationally
- P20
- Shorter cause list
- Not 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.
How Lake Mohave 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 Lake Mohave nationally is assessed size: 27,001 acres, larger than 100% of the 38,628 lake-type units with an area on file.
A split ruling across uses
This record splits: Not Supporting on aquatic life, Fully Supporting on recreation. The divergence is inside the designated-use matrix, not a single all-or-nothing label.
Lake Mohave: Category 5, TMDL still owed
Category 5 is the Integrated Report band where a TMDL (or equivalent) is still expected for Lake Mohave. 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 Lake Mohave 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, Nevada carries 69 filed lake-type waterbodies in the August 2026 extract, and this page renders the assessment record EPA assigned to Lake Mohave 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. Monitoring behind at least one of these designated-use verdicts ran through 2022, as Nevada filed it. Nevada filed its own confidence on the 3 definitive verdicts it rated: Low. That rating is the filer's, in EPA's own field, and EPA publishes no definition of the four words it offers.
| Designated use | Group | Verdict |
|---|---|---|
| Aquatic Life | Aquatic-life or related | Not Supporting Filer confidence: Low |
| Industrial Supply | Other | Fully Supporting Filer confidence: Low |
| Recreation Involving Contact with the Water | Recreation | Fully Supporting Filer confidence: Low |
| Irrigation | Other | Not Assessed |
| Municipal or Domestic Supply | Drinking-water supply designation | Not Assessed |
| Propagation of Wildlife | Other | Not Assessed |
| Recreation Not Involving Contact with the Water | Recreation | Not Assessed |
| Water and Organisms | Aquatic-life or related | Not Assessed |
| Watering of Livestock | Other | Not Assessed |
The record
Listed impairment causes
Causes the state listed as impairing designated uses of this reservoir, with the cycle each was first listed and the Clean Water Act action recorded against it.
| Cause | Affected uses | First listed | Cleanup standing |
|---|---|---|---|
| Temperature | Aquatic Life | 2024 | TMDL priority: Low |
Reading the record
Where Lake Mohave sits among peers
1 of 2 Nevada lakes assessed this deeply also came out mixed
Nevada ruled definitively on 3 designated uses at Lake Mohave and found 1 of 3 not supported. The dataset shows 2 Nevada lakes judged to that same depth.
Nevada's assessed lakes are most often judged on 5 or more uses; this one was judged on 3.
| 1 | 2 | 3 | 4 | 5+ | |
|---|---|---|---|---|---|
| All supported | 2 | 1 | 1 | 0 | 13 |
| Mixed | Not possible | 1 | 1 (this record) | 1 | 30 |
| None supported | 3 | 0 | 0 | 0 | 0 |
Ringed cell: Lake Mohave. Source: EPA ATTAINS, Reporting cycles 1987–2026.
Scale and rank
Lake Mohave is one of 69 lake-type waterbodies reported to EPA from Nevada, and one of 50 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 27,001 assessed acres it ranks 113th 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 112 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.
Why no water-level record
Lake Mohave has no daily USGS water-level or reservoir-storage series on this page because NWIS lists a lake monitoring site named for the waterbody, but the site is not active, and PlainLakes ingests only the active inventory, so there is no series to attach. How PlainLakes links gauges.
In context
Where Lake Mohave 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
27,001 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 Lake Mohave. Hover or tap any bar for its full count and share.
In context
Nevada context
ATTAINS carries 69 lake-type waterbodies in Nevada, 36 assessed as not supporting at least one use and 17 fully supporting. Among the 50 indexed units there, Lake Mohave ranks 27th by listed-cause count (one listed cause) and 4th by assessed size among the 50 with an area filed; it sits in the not-supporting set (36 statewide) . Its listed causes include Temperature, which also appears among Nevada's most-filed impairment causes (led by Phosphorus).
| Other large assessed lakes in Nevada | Assessed acres |
|---|---|
| Lake Mead Fully Supporting | 147,392 |
| Lake Tahoe Not Supporting | 122,902 |
| Walker Lake Not Supporting | 35,521 |
| Rye Patch Reservoir Not Supporting | 16,001 |
| Lahontan Reservoir Not Supporting | 14,178 |
| Washoe Lakes Not Supporting | 5,545 |
Peers near Lake Mohave's size or cause load
Similar assessed acres
Nearest filed extents (27,001 acres here).
- Lake Mohave · 27,044 acres · AZ
- Lake Istokpoga · 26,673 acres · FL
- Richard B. Russell Lake · 26,650 acres · GA
- Old Hickory Reservoir · 27,439 acres · TN
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 NV13-CL-38_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.