1
D06-0422-00 Lake
Big Stone County, Minnesota · 6.9 mi from Olson Lake
- +Higher grade (F → D)
- ++1.9 ft water clarity
- +Lower phosphorus (43 vs 782 µg/L)
Cleaner Lakes Than Olson Lake
2 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Olson Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 2 lakes hold a higher grade. 06-0422-00 Lake (Big Stone County, Grade D, 6.9 mi away) is the closest meaningful upgrade.
2
DUnnamed Lake
Big Stone County, Minnesota · 12.6 mi from Olson Lake
- +Higher grade (F → D)
- ++6.2 ft water clarity
- +Lower phosphorus (167.5 vs 782 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.