Madison Parish County Lake Quality
Louisiana, 1 lake, average grade F (Algae-prone)
Madison Parish 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 average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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. Eagle Lake (F) is the cleanest in the county.
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Quick Answers for Madison Parish County
Planning a trip? Check special fishing regulations for Eagle Lake — or check the official Louisiana fishing regulations.
All Lakes in Madison Parish County
1 lake1 graded lake
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | FEagle LakeMadison Parish | F | 1.5 ft | 185 µg/L | 55.7 µg/L | No recent samples | Not recorded |
Lake Match
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Other Counties in Louisiana
See how Madison Parish 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.