Keweenaw County Lake Quality

Michigan, 19 lakes, average grade B (Good)

There are 19 graded lakes in Keweenaw County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. With an average grade of B, Keweenaw County sits comfortably above the Michigan median.

The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Lake Gratiot (A); the most-stressed is Hidden Lake (C).

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Quick Answers for Keweenaw County

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

Planning a trip? Check special fishing regulations for Lake Gratiot — or check the official Michigan fishing regulations.

Fishing in Keweenaw County

Keweenaw County Fishing Guide

Fish species and best-graded lakes in Keweenaw County

All Lakes in Keweenaw County

Rank	Lake	Grade	Clarity	Phosphorus
1	Lake Gratiot	A	17.8 ft	-
2	Gratiot Lake	A	19 ft	-
3	Lake Harvey	A	10.5 ft	11.6 µg/L
4	Sargent Lake	A	10.4 ft	17.3 µg/L
5	Siskiwit Lake	A	19.3 ft	24.5 µg/L
6	Lake Richie	B	8.3 ft	17.8 µg/L
7	Beaver Lake	B	8 ft	17.1 µg/L
8	Feldtmann Lake	B	7.3 ft	14.2 µg/L
9	Lake George	B	8 ft	9.9 µg/L
10	Lake Ahmik	B	7 ft	17 µg/L
11	Lake Whittlesey	B	11.6 ft	23.3 µg/L
12	Lake Desor	B	7.8 ft	22.7 µg/L
13	Chickenbone Lake	C	6.1 ft	28.2 µg/L
14	Epidote Lake	C	7.2 ft	-
15	Hidden Lake	C	2.5 ft	27.5 µg/L