B

Grand Sable Lake

Alger County, WisconsinMesotrophic

Grand Sable Lake is a mesotrophic lake in Alger County, MI. Water quality is graded B based on 2 sampling years through 2024. Compared to the 12 other monitored lakes in Alger County, Grand Sable Lake ranks #10 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-08-20. 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 8.9 ft. Phosphorus level: 11.8 µg/L. Trophic State Index: 43.

Metric	Value	Grade
Water Clarity (Secchi Depth)	8.9 ft	C
Phosphorus	11.8 µg/L	A
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	43	Mesotrophic

Moderate nutrients, good water quality

Location

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County Ranking

Ranked #10 of 13 lakes in Alger County

Cleaner Lakes Within 30 Miles

Grand Sable Lake holds Grade B. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Alger County

Tie Lake; Deep Basin; Munising Township

Csmi 2021 Station Med Lake

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

Family fishing lakes in Wisconsin

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

Grand Sable Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

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

Source: EPA ATTAINS assessment unit MI040202010209-04 · Official waterbody report

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: 2024-08-20

Monitoring stations: 1