Mississippi reservoir · state assessment record
Roebuck Lake
Assessment decisions reported by Mississippi to EPA under Clean Water Act sections 303(d) and 305(b), last assessed in the 2018 reporting cycle.
- 728
- Assessed acres
- Lake / Reservoir / Pond
- Water type
This waterbody in one line
Roebuck Lake, a reservoir in Mississippi, is assessed as not supporting one or more designated uses, with 2 listed impairment causes in the state's most recent Integrated Report cycle (2018). By assessed acreage it sits among the largest 10% by assessed acreage nationally (38,628 lakes); its impairment list is among the longest nationally (2 listed causes vs 23,610 assessed lakes). Aquatic life is assessed as fully supporting. Fish consumption is assessed as not supporting.
- Not Supporting
- overall status
- P93
- Assessed size nationally
- P10
- 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.
Reading Roebuck Lake'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 Roebuck Lake nationally is assessed size: 727.6 acres, larger than 93% of the 38,628 lake-type units with an area on file.
Not one verdict, several
This record splits: Not Supporting on fish consumption, Fully Supporting on aquatic life. The divergence is inside the designated-use matrix, not a single all-or-nothing label.
Roebuck Lake: Category 4A reading
Category 4A means a TMDL (or equivalent) is already approved for the impairment on Roebuck Lake. The remaining work is implementation and tracking, read the cleanup-standing and cause rows for what the state already committed to address.
Longer than most cause lists
2 listed causes puts this unit above 80% of assessed lake-type records by list length. Treat that as a coding-and-sampling signal: states that split pollutants finely mint longer lists without proving worse water.
Overall status: not supporting
The filer's overall status for Roebuck Lake is Not Supporting. That tile summarizes the assessment unit; the designated-use rows and cause list are the evidence behind it.
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 Roebuck 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. Mississippi filed its own confidence on the one definitive verdict it rated: Good. 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 Support | Aquatic-life or related | Fully Supporting Filer confidence: Good |
| Fish Consumption | Fish-consumption or fishery | Not Supporting |
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 |
|---|---|---|---|
| DDT in Fish Tissue | Fish Consumption | 1998 | TMDL approved |
| Toxaphene | Fish Consumption | 1998 | TMDL approved |
Probable sources
Mississippi 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
Roebuck Lake: Category 4A reading
4A Category 4A: impaired, TMDL completed
Mississippi filed this assessment unit as Category 4A: impaired, with a pollutant-budget TMDL already completed under 303(d). The listing remains an impairment finding; the plan is on file rather than still awaiting write-up.
Scale and rank
Roebuck Lake is one of 114 lake-type waterbodies reported to EPA from Mississippi, and one of 14 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 728 assessed acres it ranks 2,856th 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 2,855 lakes with a larger one.
Open in the register
The state has not yet filed a definitive recreation verdict for this record; that field populates when it reports it in a future Integrated Report cycle.
Why no water-level record
Roebuck Lake 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 Roebuck 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
728 Top 7% larger than 93% 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
2 Longer than most more listed causes than 80% 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 Roebuck Lake. 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. Among the 14 indexed units there, Roebuck Lake ranks 4th by listed-cause count (2 listed causes) and 8th by assessed size among the 14 with an area filed; it sits in the not-supporting set (14 statewide) . Its listed causes (DDT in Fish Tissue and Toxaphene) sit outside Mississippi's top-five list, which is led by Mercury in Fish Tissue.
| 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 |
Peers near Roebuck Lake's size or cause load
Similar assessed acres
Nearest filed extents (728 acres here).
- Little Sodus Bay · 728 acres · NY
- St. Catherine · 728 acres · VT
- Baby · 728 acres · MN
- Higley Falls Reservoir · 726 acres · NY
Similar cause load
Nearest listed-cause counts (2 here). Peers already in the acreage column are omitted.
- 12th St. Beach · 2 causes · IL
- 31st St. Beach · 2 causes · IL
- 49th St. Beach · 2 causes · IL
- 57th St. Beach · 2 causes · IL
What to do with this record
- The fish-consumption use is assessed as not supporting. Before eating fish from this reservoir, check your state fish-advisory program for species-specific meal limits. 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 MS938212. 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.