1
BSand Hill Lake
Polk County, Minnesota · 4 mi from Unnamed Lake
- +Higher grade (C → B)
- ++3.6 ft water clarity
Cleaner Lakes Than Unnamed Lake
3 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Unnamed Lake carries a Grade C (Fair) water quality score. Within 30 miles, 3 lakes hold a higher grade. Sand Hill Lake (Polk County, Grade B, 4 mi away) is the closest meaningful upgrade.
2
BPoplar Lake
Polk County, Minnesota · 8.5 mi from Unnamed Lake
- +Higher grade (C → B)
- ++5.6 ft water clarity
3
CSpring Lake
Polk County, Minnesota · 8.5 mi from Unnamed Lake
- +Higher overall water quality score
- ++1.6 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.