1
ASaint Mary'S River Offshore Lake
Chippewa County, Wisconsin · 1 mi from Back Bay Lake
- +Two grade letters higher (C → A)
Cleaner Lakes Than Back Bay Lake
4 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Back Bay Lake carries a Grade C (Fair) water quality score. Within 30 miles, 4 lakes hold a higher grade. Saint Mary'S River Offshore Lake (Chippewa County, Grade A, 1 mi away) is the closest meaningful upgrade.
2
ASaint Mary'S River Shore Lake
Chippewa County, Wisconsin · 0.9 mi from Back Bay Lake
- +Two grade letters higher (C → A)
3
BBack Bay Deep Lake
Chippewa County, Wisconsin · 1.2 mi from Back Bay Lake
- +Higher grade (C → B)
- ++3.3 ft water clarity
- +Lower phosphorus (15 vs 20.9 µg/L)
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.