1
CEagle Lake
Carlton County, Minnesota · 3.4 mi from Island Lake
- +Higher overall water quality score
- ++2 ft water clarity
- +Lower phosphorus (34 vs 45.5 µg/L)
Cleaner Lakes Than Island Lake
3 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Island Lake carries a Grade C (Fair) water quality score. Within 30 miles, 3 lakes hold a higher grade. Eagle Lake (Carlton County, Grade C, 3.4 mi away) is the closest meaningful upgrade.
2
CSpruce Lake
Carlton County, Minnesota · 7.3 mi from Island Lake
- +Higher overall water quality score
- +Lower phosphorus (19 vs 45.5 µg/L)
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.