1
BSand Hill Lake
Polk County, Minnesota · 5.7 mi from Beaulieu Lake
- +Two grade letters higher (F → B)
- ++5.6 ft water clarity
- +Lower phosphorus (26 vs 90 µg/L)
Cleaner Lakes Than Beaulieu Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Beaulieu Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. Sand Hill Lake (Polk County, Grade B, 5.7 mi away) is the closest meaningful upgrade.
2
BPoplar Lake
Polk County, Minnesota · 10 mi from Beaulieu Lake
- +Two grade letters higher (F → B)
- ++7.6 ft water clarity
- +Lower phosphorus (23 vs 90 µg/L)
3
BSarah Lake
Polk County, Minnesota · 12.2 mi from Beaulieu Lake
- +Two grade letters higher (F → B)
- ++6.6 ft water clarity
- +Lower phosphorus (29.5 vs 90 µg/L)
4
CSpring Lake
Polk County, Minnesota · 10.4 mi from Beaulieu Lake
- +Two grade letters higher (F → C)
- ++3.6 ft water clarity
- +Lower phosphorus (27.5 vs 90 µg/L)
5
CUnnamed Lake
Mahnomen County, Minnesota · 2.2 mi from Beaulieu Lake
- +Two grade letters higher (F → C)
- ++2 ft water clarity
- +Lower phosphorus (23 vs 90 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.