Ontonagon County Lake Quality
Michigan, 6 lakes, average grade A (Excellent)
Only 6 lakes in Ontonagon County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county's average grade is A — among the cleanest in Michigan. 0 lakes pull an A on their own, and almost none fall into the D or F brackets.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Lake Gogebic; North Deep Basin; Bergland Township (C) is the cleanest in the county.
Quick Answers for Ontonagon County
Planning a trip? Check special fishing regulations for Lake Gogebic; North Deep Basin; Bergland Township, whether the fish are safe to eat, and the best times to fish — or check the official Michigan fishing regulations.
All Lakes in Ontonagon County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lake Gogebic; North Deep Basin; Bergland Township | C | 6.5 ft | - |
Other Counties in Michigan
See how Ontonagon County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.
Where to stay near Ontonagon County
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Source: EPA National Aquatic Resource Surveys, 2026.