1
AWhitefish Lake
Douglas County, Wisconsin · mi from St Croix Flowage Lake
- +Higher grade (B → A)
- ++17.7 ft water clarity
- +Lower phosphorus (11.4 vs 23.2 µg/L)
Cleaner Lakes Than St Croix Flowage Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
St Croix Flowage Lake carries a Grade B (Good) water quality score. Within 30 miles, 5 lakes hold a higher grade. Whitefish Lake (Douglas County, Grade A, null mi away) is the closest meaningful upgrade.
2
AWhitefish Lake
Douglas County, Wisconsin · mi from St Croix Flowage Lake
- +Higher grade (B → A)
- ++18.5 ft water clarity
- +Lower phosphorus (9.4 vs 23.2 µg/L)
3
ABardon Lake
Douglas County, Wisconsin · mi from St Croix Flowage Lake
- +Higher grade (B → A)
- ++20.2 ft water clarity
- +Lower phosphorus (9.4 vs 23.2 µg/L)
4
ALeader Lake
Douglas County, Wisconsin · mi from St Croix Flowage Lake
- +Higher grade (B → A)
- ++8.5 ft water clarity
- +Lower phosphorus (9.5 vs 23.2 µg/L)
5
BSaint Croix Flowage Lake
Douglas County, Wisconsin · mi from St Croix Flowage Lake
- +Higher overall water quality score
- ++3.7 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.