Alpena County Lake Quality

Michigan, 1 lake — no lake here has enough monitoring data for a grade

Alpena County has 1 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters.

Many of the county's lakes are deep glacial basins — over 50 feet at their deepest point — which gives them thermal stratification and a buffer against summer warming. Beaver Lake (grade —) is the cleanest in the county.

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Quick Answers for Alpena County

Cleanest lakes in Alpena County →Cleanest lakes in Michigan →Safest swimming lakes in Michigan →

Planning a trip? Check special fishing regulations for Beaver Lake, whether the fish are safe to eat, and the best times to fish — or check the official Michigan fishing regulations.

All Lakes in Alpena County

1 lake · 0 graded, 1 not rated0 graded lakes · 1 not rated, hidden

Include not-rated lakes (1)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
	NRBeaver LakeAlpena	NR	16.5 ft	No recent samples	No recent samples	No recent samples	70 ft	Not recorded

NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

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