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

Allegan County Lake Quality

Michigan, 52 lakes, average grade B (Good)

Allegan County has 52 monitored lakes, enough that within-county variation matters as much as the county average. Some are deep glacial basins, others are shallow agricultural-watershed waters, and the measurements reflect that mix. 4 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. With an average grade of B, Allegan County sits comfortably above the Michigan median.

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. Osterhout Lake (A) is the cleanest in the county.

Loading map…

Where to stay near Allegan County

Top-rated places to stay near Allegan County

Prices for Sep 11–13, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Planning a trip to Allegan County?

Get lake water-quality report cards plus the best cabin & lodging deals near Allegan County — straight to your inbox. No spam, unsubscribe anytime.

Quick Answers for Allegan County

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

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

Fishing in Allegan County

Allegan County Fishing Guide

Fish species and best-graded lakes in Allegan County

All Lakes in Allegan County

52 lakes · 4 graded, 48 not rated4 graded lakes · 48 not rated, hidden

Include not-rated lakes (48)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
1	AOsterhout LakeAllegan	A	9 ft	14 µg/L	2.8 µg/L	No recent samples	No recent samples	Not recorded
2	BHutchins LakeAllegan	B	13 ft	13.5 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
3	CMoore LakeAllegan	C	6.2 ft	38 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
4	CIngerson LakeAllegan	C	9 ft	39 µg/L	1.4 µg/L	No recent samples	No recent samples	Not recorded
	NREagle LakeAllegan	NR	15 ft	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRKalamazoo LakeAllegan	NR	2.4 ft	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRGreen LakeAllegan	NR	8 ft	No recent samples	No recent samples	No recent samples	60 ft	✓ Public
	NRSwan LakeAllegan	NR	3 ft	65 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
	NRMiner LakeAllegan	NR	10.5 ft	14 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
	NRSelkirk LakeAllegan	NR	No recent samples	17 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
	NRLongterm LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRMonterey LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	29 ft	Not recorded
	NRSilver LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NREast LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	26 ft	Not recorded
	NRSelkirk LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	✓ Public
	NRDumont LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	39 ft	Not recorded
	NRMiner LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	80 ft	✓ Public
	NRMiller LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	32 ft	Not recorded
	NRLake AlleganAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	✓ Public
	NRBig LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	Not recorded
	NRRound LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	24 ft	Not recorded
	NRSwan Creek PondAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	6 ft	✓ Public
	NRLake AlleganAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLower Scott LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	7 ft	Not recorded
	NRSchermerhorn LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	21 ft	Not recorded
	NRUpper Scott LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	6 ft	Not recorded
	NRLake SixteenAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	46 ft	Not recorded
	NRSwan LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	28 ft	✓ Public
	NRPine Creek PondAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRLake DosterAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	52 ft	Not recorded
	NREmerson LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	21 ft	Not recorded
	NRDuck LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	✓ Public
	NRBase Line LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	44 ft	Not recorded
	NRLester LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	NRMinkler LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRPike LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRLittlejohn LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRPratt LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSchnable LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBig LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRGeneva LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLake SixteenAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRFenner LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRRound LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBoot LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRMud LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRHerlan LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRWetmore LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSink LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRCrooked LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NREly LakeAllegan	NR	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRGoshorn LakeAllegan	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

Which lake suits how you actually use one?

Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.

Take the quiz →

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 Allegan 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.