1
AAlpine Lake
Warren County, Wisconsin · 2.4 mi from Aspen Lake Along Southern Arm
- +Two grade letters higher (C → A)
- ++8.8 ft water clarity
- +Lower phosphorus (7 vs 20.8 µg/L)
Cleaner Lakes Than Aspen Lake Along Southern Arm
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Aspen Lake Along Southern Arm carries a Grade C (Fair) water quality score. Within 30 miles, 5 lakes hold a higher grade. Alpine Lake (Warren County, Grade A, 2.4 mi away) is the closest meaningful upgrade.
2
BLake Konstanz
Warren County, Wisconsin · 2 mi from Aspen Lake Along Southern Arm
- +Higher grade (C → B)
- ++3.9 ft water clarity
- +Lower phosphorus (7 vs 20.8 µg/L)
3
BWhippoorwill Lake
Warren County, Wisconsin · 0.7 mi from Aspen Lake Along Southern Arm
- +Higher grade (C → B)
- ++1.2 ft water clarity
- +Lower phosphorus (13.8 vs 20.8 µg/L)
4
BCastlenovo Lake
Warren County, Wisconsin · 1 mi from Aspen Lake Along Southern Arm
- +Higher grade (C → B)
- ++2.2 ft water clarity
5
BInnsbrook Lake Nr. Dam
Warren County, Wisconsin · 1.2 mi from Aspen Lake Along Southern Arm
- +Higher grade (C → B)
- ++1.4 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.