What is the water quality grade for Juno Lake Central Basin; Mason Township?

Juno Lake Central Basin; Mason Township in Cass County, Wisconsin received a water quality grade of C (Fair). Water clarity: 7 ft visibility. Chlorophyll-a (algae): 11.5 µg/L.

Is Juno Lake Central Basin; Mason Township safe to swim in?

Generally safe for swimming, moderate water quality. Juno Lake Central Basin; Mason Township has an overall water quality grade of C. Algae concentration (chlorophyll-a) is 11.5 µg/L. Always check local health department advisories before swimming.

Juno Lake Central Basin; Mason Township

Cass County, WisconsinEutrophic

Juno Lake Central Basin; Mason Township is a productive, nutrient-rich eutrophic lake in Cass County, MI. Water quality is graded C based on 2 sampling years through 2023. Compared to the 22 other monitored lakes in Cass County, Juno Lake Central Basin; Mason Township ranks #17 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-09-20. Grade methodology: LakeGrade methodology.

Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Moderate clarity, visible to about 7 ft. Chlorophyll-a: 11.5 µg/L. Trophic State Index: 52.

Metric	Value	Grade
Water Clarity (Secchi Depth)	7 ft	C
Phosphorus	No data
Chlorophyll-a (Algae)	11.5 µg/L	C
Trophic State Index (TSI)	52	Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #17 of 23 lakes in Cass County

Cleaner Lakes Within 30 Miles

Juno Lake Central Basin; Mason Township holds Grade C. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Cass County

Stone Lake Central Basin; Jefferson Township

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Birch Lake Central Basin; Porter Township

Long Lake South Central Basin

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Robbins Lake; Porter Township; Section 33

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Other Grade C Lakes in Wisconsin

Brooks Lake

Leelanau County · Clarity: 9.5 ft

Van Etten Lake North Central Basin; Oscoda Township

Iosco County · Clarity: 5.5 ft

White Lake

Muskegon County · Clarity: 6.8 ft

Little Lake Twenty

Gladwin County · Clarity: 9 ft

East Twin Lake

Montmorency County · Clarity: 9 ft

Seymour Lake; Brandon Township; Section 34

Oakland County · Clarity: 9 ft

Eutrophic Lakes in Wisconsin

Kimball Lake Van Etten Lake North Central Basin; Oscoda Township Community College Pond Pentwater Lake Northwest Basin; Pentwater Township

EPA Impairment Status

Juno Lake Central Basin; Mason Township 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 MI040500011403-03 · Official waterbody report · Matched by proximity (0.27 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: 2023-09-20

Monitoring stations: 1