1
ALone Lake
Clearwater County, Minnesota · 5.2 mi from Second Lake
- +Higher grade (B → A)
- ++12.2 ft water clarity
- +Lower phosphorus (7 vs 21 µg/L)
Cleaner Lakes Than Second Lake
3 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Second Lake carries a Grade B (Good) water quality score. Within 30 miles, 3 lakes hold a higher grade. Lone Lake (Clearwater County, Grade A, 5.2 mi away) is the closest meaningful upgrade.
2
AMinnow Lake
Clearwater County, Minnesota · 1 mi from Second Lake
- +Higher grade (B → A)
- ++3.3 ft water clarity
- +Lower phosphorus (14 vs 21 µg/L)
3
BWalker Brook Lake
Clearwater County, Minnesota · 8.7 mi from Second Lake
- +Higher overall water quality score
- ++3.8 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.