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LakeQuality
B

Long Lake South Central Basin

Cass County, WisconsinMesotrophic

Long Lake South Central Basin is a mesotrophic lake in Cass County, MI. Water quality is graded B based on 2 sampling years through 2023. The lake supports 25 documented fish species including Blackchin shiner, Blacknose shiner, and Bluegill. Compared to the 22 other monitored lakes in Cass County, Long Lake South Central Basin ranks #5 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-09-22. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 10.5 ft. Chlorophyll-a: 5.6 µg/L. Trophic State Index: 45.

MetricValueGrade
Water Clarity (Secchi Depth)10.5 ftB
PhosphorusNo data
Chlorophyll-a (Algae)5.6 µg/LB
Trophic State Index (TSI)45Mesotrophic

Moderate nutrients, good water quality

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

→ Best fishing times for Long Lake South Central Basin (14-day solunar calendar)

→ Is it safe to eat fish from Long Lake South Central Basin? (mercury & PFAS guide)

Long Lake South Central Basin fishing regulations (limits, seasons, special rules)

Location

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County Ranking

Ranked #5 of 23 lakes in Cass County

Cleaner Lakes Within 30 Miles

Long Lake South Central Basin holds Grade B. One nearby lake has a higher grade.

See full comparison →

Nearby Lakes in Cass County

EPA Impairment Status

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

Causes of impairment

Nutrients (phosphorus, nitrogen)Oxygen depletion (low DO)

Source: EPA ATTAINS assessment unit MI040500011303-06 · Official waterbody report · Matched by proximity (0.71 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: 2023-09-22

Monitoring stations: 1