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LakeQuality

Cleaner Lakes Than Thomas Mitchell Lake

2 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.

Thomas Mitchell Lake carries a Grade D (Poor) water quality score. Within 30 miles, 2 lakes hold a higher grade. Terra Park Lake (Polk County, Grade A, 16.8 mi away) is the closest meaningful upgrade.

1
A

Terra Park Lake

Polk County, Wisconsin · 16.8 mi from Thomas Mitchell Lake
  • +Two grade letters higher (D → A)
  • ++8.2 ft water clarity
2
C

Lake Petocka

Polk County, Wisconsin · 5.3 mi from Thomas Mitchell Lake
  • +Higher grade (D → C)

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.

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