1
AIsland Lake Central Basin; Sherman Township
Gladwin County, Wisconsin · 5.7 mi from Lancelot Lake Southwest Basin
- +Higher grade (B → A)
- ++6.5 ft water clarity
Cleaner Lakes Than Lancelot Lake Southwest Basin
2 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Lancelot Lake Southwest Basin carries a Grade B (Good) water quality score. Within 30 miles, 2 lakes hold a higher grade. Island Lake Central Basin; Sherman Township (Gladwin County, Grade A, 5.7 mi away) is the closest meaningful upgrade.
2
ALancer Lake Southeast
Gladwin County, Wisconsin · 1.3 mi from Lancelot Lake Southwest Basin
- +Higher grade (B → A)
- ++3.2 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.