Lenawee County Lake Quality
Michigan, 8 lakes, average grade A (Excellent)
Lenawee County has 8 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. On average, Lenawee County lakes grade an A. That puts it near the top of the Michigan county ranking.
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 Round Lake (A); the most-stressed is Round Lake (A).
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Quick Answers for Lenawee County
Planning a trip? Check special fishing regulations for Round Lake, whether the fish are safe to eat, and the best times to fish — or check the official Michigan fishing regulations.
Fishing in Lenawee County
All Lakes in Lenawee County
8 lakes · 2 graded, 6 not rated2 graded lakes · 6 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | ARound LakeLenawee | A | 12.3 ft | 8 µg/L | 2 µg/L | No recent samples | 67 ft | Not recorded |
| 2 | ADevils LakeLenawee | A | 11 ft | 9 µg/L | 2.2 µg/L | No recent samples | No recent samples | Not recorded |
| NRPosey LakeLenawee | NR | 5 ft | No recent samples | No recent samples | No recent samples | 45 ft | Not recorded | |
| NREvans LakeLenawee | NR | 14 ft | No recent samples | No recent samples | No recent samples | 42 ft | Not recorded | |
| NRRound LakeLenawee | NR | 10 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRSand LakeLenawee | NR | 13.3 ft | No recent samples | No recent samples | No recent samples | 53 ft | ✓ Public | |
| NRSouth LakeLenawee | NR | 9.8 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRSilver LakeLenawee | NR | 11 ft | No recent samples | No recent samples | No recent samples | 26 ft | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
Lake Match
Which lake suits how you actually use one?
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 Michigan
See how Lenawee 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.