1
ABoxell Lake
Cass County, Minnesota · 3.4 mi from Three Island Lake
- +Higher grade (B → A)
- ++5.5 ft water clarity
Cleaner Lakes Than Three Island Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Three Island Lake carries a Grade B (Good) water quality score. Within 30 miles, 5 lakes hold a higher grade. Boxell Lake (Cass County, Grade A, 3.4 mi away) is the closest meaningful upgrade.
2
AMaple Lake
Cass County, Minnesota · 3.4 mi from Three Island Lake
- +Higher grade (B → A)
- ++4.5 ft water clarity
3
ABroadwater Bay Lake
Cass County, Minnesota · 4.6 mi from Three Island Lake
- +Higher grade (B → A)
- ++5.5 ft water clarity
4
BSilver Lake
Cass County, Minnesota · 2.6 mi from Three Island Lake
- +Higher overall water quality score
- ++4 ft water clarity
5
BHorseshoe Lake
Cass County, Minnesota · 2.9 mi from Three Island 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.