1
ALake of the Falls
Iron County, Wisconsin · 0.7 mi from First Black Lake
- +Higher grade (B → A)
- ++8.2 ft water clarity
- +Lower phosphorus (19.6 vs 27.5 µg/L)
Cleaner Lakes Than First Black Lake
3 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
First Black Lake carries a Grade B (Good) water quality score. Within 30 miles, 3 lakes hold a higher grade. Lake of the Falls (Iron County, Grade A, 0.7 mi away) is the closest meaningful upgrade.
2
AWilson Lake
Iron County, Wisconsin · 4.4 mi from First Black Lake
- +Higher grade (B → A)
- ++27.9 ft water clarity
- +Lower phosphorus (14.1 vs 27.5 µg/L)
3
ATurtle Flambeau Flowage Lake
Iron County, Wisconsin · 4.7 mi from First Black Lake
- +Higher grade (B → A)
- ++11.5 ft water clarity
- +Lower phosphorus (19.7 vs 27.5 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.