1
ALong Lake
Cass County, Minnesota · 5.5 mi from Boy Lake
- +Higher grade (B → A)
- ++12.9 ft water clarity
- +Lower phosphorus (9 vs 21 µg/L)
Cleaner Lakes Than Boy Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Boy Lake carries a Grade B (Good) water quality score. Within 30 miles, 5 lakes hold a higher grade. Long Lake (Cass County, Grade A, 5.5 mi away) is the closest meaningful upgrade.
2
A3
BSwift Lake
Cass County, Minnesota · 2.4 mi from Boy Lake
- +Higher overall water quality score
- +Lower phosphorus (13.5 vs 21 µg/L)
4
BTown Line Lake
Cass County, Minnesota · 3.7 mi from Boy Lake
- +Higher overall water quality score
- +Lower phosphorus (11 vs 21 µg/L)
5
BHeadquarters Bay Lake
Cass County, Minnesota · 6.6 mi from Boy 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.