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D06-0422-00 Lake
Big Stone County, Minnesota · 12.6 mi from Grossman Slough Lake
- +Higher grade (F → D)
- +Lower phosphorus (43 vs 708 µg/L)
Cleaner Lakes Than Grossman Slough Lake
1 higher-graded lake within 30 miles, ranked by grade improvement and proximity.
Grossman Slough Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 1 lake holds a higher grade. 06-0422-00 Lake (Big Stone County, Grade D, 12.6 mi away) is the closest meaningful upgrade.
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.