St. Francois County Lake Quality
Missouri, 4 lakes, average grade B (Good)
Only 4 lakes in St. Francois County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. With an average grade of B, St. Francois County sits comfortably above the Missouri median.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Lake Capri (A); the most-stressed is Hemitite Lake (F).
Quick Answers for St. Francois County
Planning a trip? Check special fishing regulations for Lake Capri — or check the official Missouri fishing regulations.
All Lakes in St. Francois County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lake Capri | A | 16.3 ft | 5.7 µg/L |
| 2 | Lake Marseilles-Terre du Lac Lakes | A | 14.1 ft | 7.4 µg/L |
| 3 | Timberline Lakes | A | 14.3 ft | 5.5 µg/L |
| 4 | Hemitite Lake | F | 1.1 ft | 186.9 µg/L |
Other Counties in Missouri
See how St. Francois County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.
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Source: EPA National Aquatic Resource Surveys, 2026.