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

Mecosta County Lake Quality

Michigan, 45 lakes, average grade A (Excellent)

There are 45 monitored lakes in Mecosta County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. 4 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county's average grade is A — among the cleanest in Michigan. 4 lakes pull an A on their own, and almost none fall into the D or F brackets.

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 Round Lake (A); the most-stressed is Round Lake (A).

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Where to stay near Mecosta County

Top-rated places to stay near Mecosta County

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Quick Answers for Mecosta County

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

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

Fishing in Mecosta County

Mecosta County Fishing Guide

Fish species and best-graded lakes in Mecosta County

All Lakes in Mecosta County

45 lakes · 4 graded, 41 not rated4 graded lakes · 41 not rated, hidden

Include not-rated lakes (41)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
1	ARound LakeMecosta	A	9 ft	17 µg/L	6.8 µg/L	No recent samples	45 ft	Not recorded
2	AMecosta LakeMecosta	A	9.5 ft	10 µg/L	3.3 µg/L	No recent samples	39 ft	Not recorded
3	AHorsehead LakeMecosta	A	9 ft	14 µg/L	2.5 µg/L	No recent samples	No recent samples	✓ Public
4	ASchool Section LakeMecosta	A	11.8 ft	8.5 µg/L	2.7 µg/L	No recent samples	33 ft	Not recorded
	NRChippewa LakeMecosta	NR	11 ft	No recent samples	No recent samples	No recent samples	40 ft	✓ Public
	NRBlue LakeMecosta	NR	10.5 ft	No recent samples	No recent samples	No recent samples	50 ft	Not recorded
	NRLake MecostaMecosta	NR	9.8 ft	No recent samples	No recent samples	No recent samples	39 ft	✓ Public
	NRRogers Dam PondMecosta	NR	11.5 ft	11 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
	NRCanadian LakeMecosta	NR	3 ft	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRPretty LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	22 ft	✓ Public
	NRMerrill LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	27 ft	Not recorded
	NRPogy LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
	NRLong LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	21 ft	Not recorded
	NRHaymarsh Lakes (north)Mecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	27 ft	Not recorded
	NRYoungs LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	33 ft	Not recorded
	NRMartiny LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	21 ft	Not recorded
	NRBig RapidsMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBergess LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	✓ Public
	NRDiamond LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Not recorded
	NRTownline LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	50 ft	✓ Public
	NRTanner Crk. FloodingMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	21 ft	Not recorded
	NRHillsview LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	✓ Public
	NRJehnsen LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	15 ft	✓ Public
	NRPretty LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	✓ Public
	NRClear LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	✓ Public
	NRLake of the CloudsMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	32 ft	Not recorded
	NRCanadian LakesMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	Not recorded
	NRWest Canadian LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	42 ft	Not recorded
	NRBrady LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	27 ft	Not recorded
	NRMorley PondMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	NRJacks LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRHodges LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLittle Blodgett LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRCook LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLower Evans LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRLost LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBig Evans LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRUpper Evans LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRTubbs LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRBoom LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBig John Brown LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLake TwentyeightMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRHannah LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGorrel LakeMecosta	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLake LauraMecosta	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.

Lake Match

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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 Mecosta 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.