B

Brooks Lake

Leelanau County, WisconsinMesotrophic

Brooks Lake is a mesotrophic lake in Leelanau County, MI. Water quality is graded B based on 2 sampling years through 2023. Compared to the 20 other monitored lakes in Leelanau County, Brooks Lake ranks #18 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-09-09. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Moderate clarity, visible to about 9 ft. Chlorophyll-a: 6.1 µg/L. Trophic State Index: 47.

Metric	Value	Grade
Water Clarity (Secchi Depth)	9 ft	C
Phosphorus	No data
Chlorophyll-a (Algae)	6.1 µg/L	B
Trophic State Index (TSI)	47	Mesotrophic

Moderate nutrients, good water quality

Location

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County Ranking

Ranked #18 of 21 lakes in Leelanau County

Cleaner Lakes Within 30 Miles

Brooks Lake holds Grade B. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Leelanau County

Leelanau County

Glen Lake North Cent Basin; Glen Arbor Township Section 35

Leelanau County

West Arm Grand Traverse Bay 2 Mi From South Shore Lake

Leelanau County

Lake Leelanau; North Basin

Leelanau County

Leelanau County

Leelanau County

More Wisconsin Lake Rankings

Cleanest lakes in Wisconsin

Top 25 by overall water quality score

Best swimming lakes in Wisconsin

Grade A/B + low algae filter

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Panfish-rich, public access

All Wisconsin lakes

Full state directory

Other Grade B Lakes in Wisconsin

Middle Lake; Elba Township; Section 13

Lapeer County · Clarity: 9.5 ft

Livingston County · Clarity: 13 ft

Bear Lake East Basin; Pleasanton Township

Manistee County · Clarity: 11 ft

Lake County · Clarity: 14 ft

Cass County · Clarity: 10.5 ft

Byram Lake West Central Basin; Fenton Township

Genesee County · Clarity: 10 ft

Mesotrophic Lakes in Wisconsin

Middle Lake; Elba Township; Section 13 Portage Lake Shavehead Lake East Basin; Porter Township Chippewa Lake Northeast Basin; Chippewa Township

EPA Impairment Status

Brooks Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

MercuryPesticidesPCBs

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MI040601040402-01 · Official waterbody report · Matched by proximity (2.56 km)

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Most recent sample: 2023-09-09

Monitoring stations: 1