1
AMontana Lake
Marinette County, Wisconsin · 3.7 mi from Porcupine Lake-Deep Hole
- +Higher grade (B → A)
- ++7.7 ft water clarity
- +Lower phosphorus (17.5 vs 54.3 µg/L)
Cleaner Lakes Than Porcupine Lake-Deep Hole
4 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Porcupine Lake-Deep Hole carries a Grade B (Good) water quality score. Within 30 miles, 4 lakes hold a higher grade. Montana Lake (Marinette County, Grade A, 3.7 mi away) is the closest meaningful upgrade.
2
ARound Lake
Oconto County, Wisconsin · 4.7 mi from Porcupine Lake-Deep Hole
- +Higher grade (B → A)
- ++30.7 ft water clarity
- +Lower phosphorus (13.8 vs 54.3 µg/L)
3
AKelly Lake
Oconto County, Wisconsin · 4.9 mi from Porcupine Lake-Deep Hole
- +Higher grade (B → A)
- ++16 ft water clarity
- +Lower phosphorus (14.3 vs 54.3 µg/L)
4
ALong Lake
Oconto County, Wisconsin · 5.1 mi from Porcupine Lake-Deep Hole
- +Higher grade (B → A)
- ++29.1 ft water clarity
- +Lower phosphorus (10.2 vs 54.3 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.