1
AHolland Lake
Dakota County, Minnesota · 0.6 mi from O'Brien Lake
- +Higher grade (B → A)
- ++8.2 ft water clarity
Cleaner Lakes Than O'Brien Lake
1 higher-graded lake within 30 miles, ranked by grade improvement and proximity.
O'Brien Lake carries a Grade B (Good) water quality score. Within 30 miles, 1 lake holds a higher grade. Holland Lake (Dakota County, Grade A, 0.6 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.