Baldwins Lake
Cass County, WisconsinLimited DataMesotrophic
Baldwins Lake is a mesotrophic lake in Cass County, MI. Water quality is graded C based on 1 sampling years through 2022. The lake supports 33 documented fish species including Blackchin shiner, Blacknose shiner, and Blackside darter. Compared to the 22 other monitored lakes in Cass County, Baldwins Lake ranks #18 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2022-09-23. Grade methodology: LakeGrade methodology.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 8 ft. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 47 | 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 Baldwins Lake (14-day solunar calendar)
→ Is it safe to eat fish from Baldwins Lake? (mercury & PFAS guide)
→ Baldwins Lake fishing regulations (limits, seasons, special rules)
Location
County Ranking
Ranked #18 of 23 lakes in Cass County
Cleaner Lakes Within 30 Miles
Baldwins Lake holds Grade C. 2 nearby lakes hold higher grades.
- ALmj-13 LakeCass County · 1.2 mi · Two grade letters higher (C → A)
- BLong Lake South Central BasinCass County · 0.6 mi · Higher grade (C → B)
Nearby Lakes in Cass County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Leelanau County · Clarity: 9.5 ft
Iosco County · Clarity: 5.5 ft
Muskegon County · Clarity: 6.8 ft
Gladwin County · Clarity: 9 ft
Montmorency County · Clarity: 9 ft
Oakland County · Clarity: 9 ft
Mesotrophic Lakes in Wisconsin
EPA Impairment Status
Baldwins Lake 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 MI040500011303-05 · Official waterbody report · Matched by proximity (0.23 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: 2022-09-23
Monitoring stations: 1