Dauphin County Lake Quality
Wisconsin, 11 lakes, average grade C (Fair)
Dauphin County has 11 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. Dauphin County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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. Susq 65a Lake (B) is the cleanest in the county.
Quick Answers for Dauphin County
Planning a trip? Check special fishing regulations for Susq 65a Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Dauphin County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Susq 65a Lake | B | - | - | 28 µg/L |
| 2 | Susq 65b Lake | B | - | - | 28 µg/L |
| 3 | Susq 69b Lake | B | - | - | 27 µg/L |
| 4 | Susq 61a Lake | B | - | - | 26 µg/L |
| 5 | Susq 61b Lake | B | - | - | 26 µg/L |
| 6 | Susq 58c Lake | C | - | - | 56 µg/L |
| 7 | Susq 65c Lake | C | - | - | 48 µg/L |
| 8 | Susq 58b Lake | C | - | - | 33 µg/L |
| 9 | Susq 58a Lake | C | - | - | 42 µg/L |
| 10 | Susq 61c Lake | C | - | - | 46 µg/L |
| 11 | Susq 69c Lake | C | - | - | 54 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.