1
AGarlk1390a Lake
Mercer County, Wisconsin · 9.6 mi from Custer Mine Pond
- +Two grade letters higher (C → A)
- ++10.8 ft water clarity
Cleaner Lakes Than Custer Mine Pond
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Custer Mine Pond carries a Grade C (Fair) water quality score. Within 30 miles, 5 lakes hold a higher grade. Garlk1390a Lake (Mercer County, Grade A, 9.6 mi away) is the closest meaningful upgrade.
2
AQacmainstfbk Lake
Mercer County, Wisconsin · 9.9 mi from Custer Mine Pond
- +Two grade letters higher (C → A)
3
BGarlk1412dw Lake
Mercer County, Wisconsin · 22.4 mi from Custer Mine Pond
- +Higher grade (C → B)
- ++8.2 ft water clarity
5
BVelva Sportsmans Dam Lake
Ward County, Wisconsin · 26.6 mi from Custer Mine Pond
- +Higher grade (C → B)
- ++11.4 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.