1
BMary Lake
Wright County, Minnesota · 2.6 mi from Ann Lake
- +Two grade letters higher (D → B)
- ++5.3 ft water clarity
- +Lower phosphorus (21 vs 262 µg/L)
Cleaner Lakes Than Ann Lake
4 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Ann Lake carries a Grade D (Poor) water quality score. Within 30 miles, 4 lakes hold a higher grade. Mary Lake (Wright County, Grade B, 2.6 mi away) is the closest meaningful upgrade.
2
BWaverly Lake
Wright County, Minnesota · 4.7 mi from Ann Lake
- +Two grade letters higher (D → B)
- ++3.7 ft water clarity
- +Lower phosphorus (28 vs 262 µg/L)
3
CHoward Lake
Wright County, Minnesota · 3.3 mi from Ann Lake
- +Higher grade (D → C)
- +Lower phosphorus (54 vs 262 µg/L)
4
CBrooks Lake
Wright County, Minnesota · 8.5 mi from Ann Lake
- +Higher grade (D → C)
- ++1.9 ft water clarity
- +Lower phosphorus (32 vs 262 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.