Sturgeon Lake; Center of Deepest Basin; Colon Township is a productive, nutrient-rich eutrophic lake in St. Joseph County, Michigan. Water quality is graded F based on 1 sampling years through 2023. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 12 other monitored lakes in St. Joseph County, Sturgeon Lake; Center of Deepest Basin; Colon Township ranks #13 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-14. Grade methodology: LakeGrade methodology.
Watch Sturgeon Lake; Center of Deepest Basin; Colon Township water quality
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 3 ft of visibility. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Sturgeon Lake; Center of Deepest Basin; Colon Township
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Fishing Sturgeon Lake; Center of Deepest Basin; Colon Township
Recreation & Access
Location
County Ranking
Ranked #13 of 13 lakes in St. Joseph County
Cleaner Lakes Within 30 Miles
Sturgeon Lake; Center of Deepest Basin; Colon Township holds Grade F. 2 nearby lakes hold higher grades.
Nearby Lakes in St. Joseph County
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High nutrients, frequent algae, reduced clarity
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More records, surveys & data sources
EPA Impairment Status
Sturgeon Lake; Center of Deepest Basin; Colon Township is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MI040500010406-03 · Official waterbody report · Matched by proximity (0.43 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2023-09-14
Monitoring stations: 1