1
ASouth Twin Lake
Mahnomen County, Minnesota · 3.5 mi from Unnamed Lake
- +Two grade letters higher (D → A)
- ++6.9 ft water clarity
- +Lower phosphorus (14 vs 60 µg/L)
Cleaner Lakes Than Unnamed Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Unnamed Lake carries a Grade D (Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. South Twin Lake (Mahnomen County, Grade A, 3.5 mi away) is the closest meaningful upgrade.
2
AMccraney Lake
Mahnomen County, Minnesota · 5.1 mi from Unnamed Lake
- +Two grade letters higher (D → A)
- ++8.8 ft water clarity
- +Lower phosphorus (19 vs 60 µg/L)
3
ABass Lake
Mahnomen County, Minnesota · 5.8 mi from Unnamed Lake
- +Two grade letters higher (D → A)
- ++9.8 ft water clarity
- +Lower phosphorus (10 vs 60 µg/L)
4
BSargent Lake
Mahnomen County, Minnesota · 2.3 mi from Unnamed Lake
- +Two grade letters higher (D → B)
- ++5.6 ft water clarity
- +Lower phosphorus (16 vs 60 µg/L)
5
BNorth Twin Lake
Mahnomen County, Minnesota · 3.3 mi from Unnamed Lake
- +Two grade letters higher (D → B)
- ++5.2 ft water clarity
- +Lower phosphorus (17 vs 60 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.