1
ACrescent Lake
Polk County, Wisconsin · 3.1 mi from Big Round Lake
- +Two grade letters higher (C → A)
- ++20.6 ft water clarity
- +Lower phosphorus (17.4 vs 27.6 µg/L)
Cleaner Lakes Than Big Round Lake
4 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Big Round Lake carries a Grade C (Fair) water quality score. Within 30 miles, 4 lakes hold a higher grade. Crescent Lake (Polk County, Grade A, 3.1 mi away) is the closest meaningful upgrade.
2
BPogo Lake
Polk County, Wisconsin · 3.2 mi from Big Round Lake
- +Higher grade (C → B)
- ++10.8 ft water clarity
3
BLittle Blake Lake
Polk County, Wisconsin · 2.5 mi from Big Round Lake
- +Higher grade (C → B)
- ++5.9 ft water clarity
4
CBig Blake Lake
Polk County, Wisconsin · 2.5 mi from Big Round Lake
- +Higher overall water quality score
- ++4.2 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.