Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water

Mackinac County Lake Quality

Michigan, 55 lakes — no lake here has enough monitoring data for a grade

Mackinac County in Michigan carries 55 monitored lakes — one of the lake-richer counties in our dataset. Coverage that dense usually reflects active lake-association sampling alongside state-agency monitoring. No lake in Mackinac County has enough sampling behind it for an A–F grade yet. The 55 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.

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.

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Quick Answers for Mackinac County

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

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

All Lakes in Mackinac County

55 lakes · 0 graded, 55 not rated0 graded lakes · 55 not rated, hidden

Include not-rated lakes (55)

Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
NRBrevoort LakeMackinac	NR	10.5 ft	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
NRManistique LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	✓ Public
NRPullup LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	33 ft	Not recorded
NRBlack Creek FloodingMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	23 ft	Not recorded
NRDollar LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	26 ft	Not recorded
NRCranberry LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	29 ft	Not recorded
NRSouth Manistique LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	25 ft	✓ Public
NRBig Dollar LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	26 ft	Not recorded
NRShoepac LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	14 ft	Not recorded
NRMillecoquins LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	12 ft	✓ Public
NRStrouble LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	7 ft	Not recorded
NREast LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	27 ft	Not recorded
NRHill LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	19 ft	Not recorded
NRLong LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	21 ft	Not recorded
NRMitten LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	15 ft	Not recorded
NRBrowns LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	14 ft	Not recorded
NRMilakokia LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	25 ft	✓ Public
NRDry LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	22 ft	Not recorded
NRHeinz LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	18 ft	Not recorded
NRLittle Brevoort LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	✓ Public
NRDuel LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	28 ft	Not recorded
NRBatty Doe LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	19 ft	Not recorded
NRLoon LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
NRSatago LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	13 ft	Not recorded
NRRound LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	18 ft	Not recorded
NRHay LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	14 ft	Not recorded
NRGamble LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	28 ft	Not recorded
NRMartin LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	17 ft	Not recorded
NRChain LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	13 ft	Not recorded
NRFreschette LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	13 ft	Not recorded
NRLake MaryMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRTwin Lakes (west)Mackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRTwin Lakes (east)Mackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRThompson LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRLilly LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRStuart LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRLittle Mud LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRSwan MarshMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRSand LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRMud LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRBrowns LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRBurns PondMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRCranberry LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRSilver LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRMassey LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRBay City LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRLeach LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRRound LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRGrass LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRRexton LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRCrossville LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRGarnet LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRDollar LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRNelson LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
NRTee LakeMackinac	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	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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Other Counties in Michigan

Dickinson County

43 lakes · Avg grade A

Clare County

47 lakes · Avg grade A

Ogemaw County

50 lakes · Avg grade A

Cheboygan County

31 lakes · Avg grade A

Roscommon County

26 lakes · Avg grade A

Gladwin County

29 lakes · Avg grade A

See how Mackinac County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: EPA National Aquatic Resource Surveys, 2026.