1
BLittle Horseshoe Lake
Chisago County, Minnesota · 5.7 mi from Fannie Lake
- +Higher grade (C → B)
- +Lower phosphorus (16 vs 37 µg/L)
Cleaner Lakes Than Fannie Lake
1 higher-graded lake within 30 miles, ranked by grade improvement and proximity.
Fannie Lake carries a Grade C (Fair) water quality score. Within 30 miles, 1 lake holds a higher grade. Little Horseshoe Lake (Chisago County, Grade B, 5.7 mi away) is the closest meaningful upgrade.
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.