Marshall County Lake Quality
Mississippi, 1 lake, average grade B (Good)
Marshall County has 1 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Chewalla Lake (B) is the cleanest in the county.
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Quick Answers for Marshall County
Planning a trip? Check special fishing regulations for Chewalla Lake — or check the official Mississippi fishing regulations.
All Lakes in Marshall County
1 lake1 graded lake
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BChewalla LakeMarshall | B | 2.5 ft | 20 µg/L | 11.4 µg/L | No recent samples | Not recorded |
Lake Match
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Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
Other Counties in Mississippi
See how Marshall County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.