1
BCleaner Lakes Than Grav Arm 11 Lake
3 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Grav Arm 11 Lake carries a Grade B (Good) water quality score. Within 30 miles, 3 lakes hold a higher grade. Loto Lake (Morgan County, Grade B, 1.1 mi away) is the closest meaningful upgrade.
2
B3
BGrav Arm 10 Lake
Morgan County, Wisconsin · 1.3 mi from Grav Arm 11 Lake
- +Higher overall water quality score
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.