Eagle Lake is a productive, nutrient-rich eutrophic lake in Cass County, Michigan. Water quality is graded D based on 1 sampling years through 2022. Water clarity is improving over recent sampling years. The lake supports 22 documented fish species including Black crappie, Blackchin shiner, and Blacknose shiner. Compared to the 22 other monitored lakes in Cass County, Eagle Lake ranks #19 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-15. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 6 ft. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Eagle Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Eagle Lake
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.185 m/yr | 4 |
| Chlorophyll-a | ↓ Declining | +0.6 µg/L/yr | 3 |
Location
County Ranking
Ranked #19 of 23 lakes in Cass County
Cleaner Lakes Within 30 Miles
Eagle Lake holds Grade D. 3 nearby lakes hold higher grades.
Nearby Lakes in Cass County
Explore Eagle Lake across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Cass County
Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Grade D Lakes in Michigan
Berrien County · Clarity: 5 ft
St. Joseph County · Clarity: 5 ft
St. Joseph County · Clarity: 6.5 ft
St. Joseph County · Clarity: 4.5 ft
Van Buren County · Clarity: 6.5 ft
Kalamazoo County · Clarity: 4 ft
Eutrophic Lakes in Michigan
More records, surveys & data sources
EPA Impairment Status
Eagle Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040500011403-04 · Official waterbody report
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Eagle Lake under Clean Water Act (NPDES) discharge permits.
- Prairieview Farm, Phase TwoElkhart · 3.4 mi away · NPDES INR10P510
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-09-15
Monitoring stations: 1