1
AWilke Lake
Manitowoc County, Wisconsin · 12.3 mi from Long Lake
- +Two grade letters higher (D → A)
- ++17.8 ft water clarity
- +Lower phosphorus (16.5 vs 90.4 µg/L)
Cleaner Lakes Than Long Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Long Lake carries a Grade D (Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. Wilke Lake (Manitowoc County, Grade A, 12.3 mi away) is the closest meaningful upgrade.
2
APigeon Lake
Manitowoc County, Wisconsin · 13.4 mi from Long Lake
- +Two grade letters higher (D → A)
- ++24.4 ft water clarity
- +Lower phosphorus (15.4 vs 90.4 µg/L)
3
ASpring Lake
Manitowoc County, Wisconsin · 13.6 mi from Long Lake
- +Two grade letters higher (D → A)
- ++21 ft water clarity
- +Lower phosphorus (19.6 vs 90.4 µg/L)
4
AShoe Lake
Manitowoc County, Wisconsin · 13.6 mi from Long Lake
- +Two grade letters higher (D → A)
- ++17.8 ft water clarity
- +Lower phosphorus (26.6 vs 90.4 µg/L)
5
CBullhead Lake
Manitowoc County, Wisconsin · 2.4 mi from Long Lake
- +Higher grade (D → C)
- ++7.9 ft water clarity
- +Lower phosphorus (68.4 vs 90.4 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.