1
BBrownie Lake
Hennepin County, Minnesota · 1.3 mi from Lake of the Isles
- +Higher grade (C → B)
- +Lower phosphorus (3.4 vs 51.5 µg/L)
Cleaner Lakes Than Lake of the Isles
4 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Lake of the Isles carries a Grade C (Fair) water quality score. Within 30 miles, 4 lakes hold a higher grade. Brownie Lake (Hennepin County, Grade B, 1.3 mi away) is the closest meaningful upgrade.
2
CBde Maka Ska Lake
Hennepin County, Minnesota · 0.7 mi from Lake of the Isles
- +Higher overall water quality score
- ++5.8 ft water clarity
3
CSpring Lake
Hennepin County, Minnesota · 1.3 mi from Lake of the Isles
- +Higher overall water quality score
- +Lower phosphorus (7.1 vs 51.5 µg/L)
4
CWirth Lake
Hennepin County, Minnesota · 2.2 mi from Lake of the Isles
- +Higher overall water quality score
- ++4.8 ft water clarity
- +Lower phosphorus (31 vs 51.5 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.