1
BNorth Lemmon Lake
Adams County, Wisconsin · 22.9 mi from Mirror Lake
- +Two grade letters higher (F → B)
- ++3.6 ft water clarity
Cleaner Lakes Than Mirror Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Mirror Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. North Lemmon Lake (Adams County, Grade B, 22.9 mi away) is the closest meaningful upgrade.
2
CIndian Creek Dam Lake
Hettinger County, Wisconsin · 23.8 mi from Mirror Lake
- +Two grade letters higher (F → C)
3
CBowman-Haley Dam Lake
Bowman County, Wisconsin · 29.4 mi from Mirror Lake
- +Two grade letters higher (F → C)
- ++1.8 ft water clarity
5
DCastle Rock Dam Lake
Hettinger County, Wisconsin · 26.3 mi from Mirror Lake
- +Higher grade (F → D)
- ++1.7 ft water clarity
How this list is built
Every lake on LakeQuality has a calculated grade from EPA Water Quality Portal samples — secchi depth, total phosphorus, and chlorophyll-a measured against Metropolitan Council thresholds. To suggest cleaner alternatives, we filter lakes within 30 miles to those with a strictly higher numeric score, then rank by grade improvement with a small proximity tiebreak. Cross-state and limited-data lakes are excluded so the list stays locally relevant.