Mississippi reservoir · state assessment record
Pool B
The assessment record reported by Mississippi to EPA under Clean Water Act sections 303(d) and 305(b), filed in the 2018 reporting cycle.
- 2,434
- Assessed acres
- Lake / Reservoir / Pond
- Water type
This waterbody in one line
Pool B, a reservoir in Mississippi, was reported but not assessed in the state's most recent Integrated Report cycle (2018). By assessed acreage it sits among the largest 5% by assessed acreage nationally (38,628 lakes).
- Not Assessed
- overall status
- P97
- Assessed size nationally
Assessment verdicts are the state agency's decisions as reported to EPA ATTAINS; PlainLakes renders them without modification.
Reading Pool B's filed record
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 Pool B nationally is assessed size: 2,434 acres, larger than 97% of the 38,628 lake-type units with an area on file.
IR category 3 on Pool B
The Integrated Report category filed for Pool B is 3. PlainLakes renders EPA's code without remapping it into a consumer grade.
Overall status: Not Assessed
ATTAINS overall status on this unit is “Not Assessed”. PlainLakes does not rewrite that vocabulary into a consumer score.
According to the U.S. Environmental Protection Agency's ATTAINS program, Mississippi carries 114 filed lake-type waterbodies in the August 2026 extract, and this page renders the assessment record EPA assigned to Pool B 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 |
|---|---|---|
| Aquatic Life Use Support | Aquatic-life or related | Not Assessed |
The record
Listed impairment causes
The state reported this reservoir in its 2018 Integrated Report cycle but reached no assessment determination, so no causes are listed. The unit is recorded under EPA integrated-reporting Category 3: reviewed, with insufficient information to determine whether it meets water-quality standards. An undetermined waterbody is neither confirmed clean nor confirmed impaired.
Reading the record
What Pool B's record holds
Scale and rank
Pool B is one of 114 lake-type waterbodies reported to EPA from Mississippi. It is not among the 14 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 2,434 assessed acres it ranks 1,181st 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 1,180 lakes with a larger one.
What this record holds
Mississippi filed this reservoir in its 2018 Integrated Report cycle but reached no determination, so the record holds that filing and its use rows, but no verdict, and with nothing judged, 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 Pool B 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
2,434 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 Pool B. Hover or tap any bar for its full count and share.
In context
Mississippi context
ATTAINS carries 114 lake-type waterbodies in Mississippi, 14 assessed as not supporting at least one use and 84 fully supporting.
| Other large assessed lakes in Mississippi | Assessed acres |
|---|---|
| Ross Barnett Reservoir Assessment unit MS507511 Fully Supporting | 20,737 |
| Sardis Lake Fully Supporting | 15,277 |
| Grenada Lake Assessment unit MS914611 Fully Supporting | 9,927 |
| Arkabutla Lake Fully Supporting | 6,279 |
| Grenada Lake Assessment unit MS915811 Not Supporting | 6,011 |
| Ross Barnett Reservoir Assessment unit MS507412 Fully Supporting | 5,483 |
Lakes near Pool B's assessed acres
Similar assessed acres
Nearest filed extents (2,434 acres here).
- Mary · 2,434 acres · MN
- Kabekona · 2,434 acres · MN
- Smith Mtn. Lake (Roanoke River) · 2,435 acres · VA
- Long Lake · 2,436 acres · ME
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 MS819312. 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.