Main Section Lake
Clinton County, WisconsinMesotrophic
Main Section Lake is a mesotrophic lake in Clinton County, NY. Water quality is graded A based on 3 sampling years through 2024. Compared to the 2 other monitored lakes in Clinton County, Main Section Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-10-25. Grade methodology: LakeGrade methodology.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 14.8 ft. Phosphorus level: 9.4 µg/L. Chlorophyll-a: 4.7 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.8 ft | B |
| Phosphorus | 9.4 µg/L | A |
| Chlorophyll-a (Algae) | 4.7 µg/L | A |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #3 of 3 lakes in Clinton County
Nearby Lakes in Clinton County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
EPA Impairment Status
Main Section Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NY1001-0001 · Official waterbody report · Matched by proximity (0.63 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: 2024-10-25
Monitoring stations: 1