1
ACruson Slough Lake
Richland County, Wisconsin · 4 mi from Avoca Lake
- +Two grade letters higher (D → A)
- ++18.5 ft water clarity
- +Lower phosphorus (28.9 vs 80.5 µg/L)
Cleaner Lakes Than Avoca Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Avoca Lake carries a Grade D (Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. Cruson Slough Lake (Richland County, Grade A, 4 mi away) is the closest meaningful upgrade.
2
AGoodwiler Lake
Iowa County, Wisconsin · 5.1 mi from Avoca Lake
- +Two grade letters higher (D → A)
- ++8.7 ft water clarity
- +Lower phosphorus (29.7 vs 80.5 µg/L)
3
BKendal Lake
Iowa County, Wisconsin · 3.3 mi from Avoca Lake
- +Two grade letters higher (D → B)
- ++16 ft water clarity
- +Lower phosphorus (32.7 vs 80.5 µg/L)
4
BLong Lake
Sauk County, Wisconsin · 7.3 mi from Avoca Lake
- +Two grade letters higher (D → B)
- ++6.9 ft water clarity
- +Lower phosphorus (27.9 vs 80.5 µg/L)
5
BBakkens Pond
Sauk County, Wisconsin · 9.1 mi from Avoca Lake
- +Two grade letters higher (D → B)
- ++1.6 ft water clarity
- +Lower phosphorus (23.3 vs 80.5 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.