Monroe County Lake Quality
Indiana, 7 lakes, average grade C (Fair)
Only 7 lakes in Monroe 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. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Monroe Lake (D); the most-stressed is Lake Lemon (F).
Quick Answers for Monroe County
Planning a trip? Check special fishing regulations for Monroe Lake, whether the fish are safe to eat, and the best times to fish — or check the official Indiana fishing regulations.
Fishing in Monroe County
All Lakes in Monroe County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Monroe Lake | D | 5.7 ft | - |
| 2 | Lake Lemon | F | 2.1 ft | - |
Other Counties in Indiana
See how Monroe County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.
Where to stay near Monroe County
Top-rated places to stay near Monroe County
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Source: EPA National Aquatic Resource Surveys, 2026.