1
CWpa-06 Lake
Pike County, Wisconsin · 15.2 mi from Olp-09 Lake
- +Two grade letters higher (F → C)
- ++4.5 ft water clarity
Cleaner Lakes Than Olp-09 Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Olp-09 Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. Wpa-06 Lake (Pike County, Grade C, 15.2 mi away) is the closest meaningful upgrade.
3
CWpa-03 Lake
Dubois County, Wisconsin · 10.9 mi from Olp-09 Lake
- +Two grade letters higher (F → C)
- ++4 ft water clarity
4
CWpa-07 Lake
Gibson County, Wisconsin · 17 mi from Olp-09 Lake
- +Two grade letters higher (F → C)
- ++2.4 ft water clarity
5
DOlp-10 Lake
Warrick County, Wisconsin · 17.2 mi from Olp-09 Lake
- +Higher grade (F → D)
- ++1.8 ft water clarity
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.