1
CSilver Lake
Sargent County, Wisconsin · 1.5 mi from Sprague Lake
- +Two grade letters higher (F → C)
- ++4.3 ft water clarity
Cleaner Lakes Than Sprague Lake
2 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Sprague Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 2 lakes hold a higher grade. Silver Lake (Sargent County, Grade C, 1.5 mi away) is the closest meaningful upgrade.
2
CAlkali Lake
Sargent County, Wisconsin · 7.5 mi from Sprague Lake
- +Two grade letters higher (F → C)
- ++3 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.