1
ALake Wauwanoka Nr. Dam
Jefferson County, Wisconsin · 7.2 mi from Lake Tishomingo Nr. Dam
- +Two grade letters higher (C → A)
- ++7.5 ft water clarity
- +Lower phosphorus (8 vs 23.5 µg/L)
Cleaner Lakes Than Lake Tishomingo Nr. Dam
4 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Lake Tishomingo Nr. Dam carries a Grade C (Fair) water quality score. Within 30 miles, 4 lakes hold a higher grade. Lake Wauwanoka Nr. Dam (Jefferson County, Grade A, 7.2 mi away) is the closest meaningful upgrade.
2
ACattails 2 Lake
Jefferson County, Wisconsin · 11.7 mi from Lake Tishomingo Nr. Dam
- +Two grade letters higher (C → A)
3
BCattails 1 Lake
Jefferson County, Wisconsin · 11.8 mi from Lake Tishomingo Nr. Dam
- +Higher grade (C → B)
- +Lower phosphorus (16 vs 23.5 µg/L)
4
BMarion Reservoir
Franklin County, Wisconsin · 9.1 mi from Lake Tishomingo Nr. Dam
- +Higher grade (C → B)
- +Lower phosphorus (16 vs 23.5 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.