Coldwater Lake Southeast Basin; Nottawa Township
Isabella County, WisconsinMesotrophic
Coldwater Lake Southeast Basin; Nottawa Township is a mesotrophic lake in Isabella County, MI. Water quality is graded A based on 2 sampling years through 2023. The lake supports 1 documented fish species including Lake herring. Compared to the 1 other monitored lakes in Isabella County, Coldwater Lake Southeast Basin; Nottawa Township ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-09-14. 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 10.5 ft. Chlorophyll-a: 2.1 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 2.1 µg/L | A |
| Trophic State Index (TSI) | 40 | Mesotrophic |
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 Coldwater Lake Southeast Basin; Nottawa Township (14-day solunar calendar)
Location
County Ranking
Ranked #1 of 2 lakes in Isabella County
Nearby Lakes in Isabella County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Mecosta County · Clarity: 12.8 ft
Benzie County · Clarity: 13.5 ft
Clare County · Clarity: 15 ft
Kalkaska County · Clarity: 16 ft
Gogebic County · Clarity: 18 ft
Iron County · Clarity: 16 ft
Mesotrophic Lakes in Wisconsin
EPA Impairment Status
Coldwater Lake Southeast Basin; Nottawa Township is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040802020204-07 · Official waterbody report · Matched by proximity (0.75 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: 2023-09-14
Monitoring stations: 1