Eagle Lake
Cass County, Michigan399 acresView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Impaired · Mercury
- 35 ft max depth
- Public access
- Limited data
Eagle Lake in Cass County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 7 ft visibility. Maximum depth: 35 ft. Surface area: 399.2 acres.
- Clarity
- 7 ft
- Max depth
- 35 ft
- Area
- 399 acres
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Eagle Lake’s letter
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Why Eagle Lake has no grade
Eagle Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Eagle Lake is Not Rated — not an F. Its 7-foot median from 106 readings collected 2016–2022 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by EGLE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Eagle Lake is a 399-acre lake in Cass County, Michigan with a maximum depth of 35 feet. Overall water quality is improving over recent sampling years. The lake supports 22 documented fish species including Black crappie, Blackchin shiner, and Blacknose shiner. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-15. Grade methodology: LakeQuality methodology.
What Eagle Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing22 species recorded
- Deep water35 ft surveyed max depth
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Eagle Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Water quality measurements for Eagle Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 7 ft. TSI 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 35 ft |
| Surface Area | 399 acres |
| Public Access | Yes |
Recreation & Access
- Eagle LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Eagle Lake
Water Quality Trend: ↑ Improving
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.219 m/yr | 8 |
| Phosphorus | ↑ Improving | -0.45 µg/L/yr | 7 |
| Chlorophyll-a | ↓ Declining | +0.36 µg/L/yr | 7 |
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
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.
Graded lakes near Eagle Lake
Eagle Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Cass County
Frequently asked questions about Eagle Lake
Where is Eagle Lake?
- Eagle Lake is a lake in Cass County, Michigan. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Eagle Lake?
- Eagle Lake in Cass County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 7 ft visibility. Maximum depth: 35 ft. Surface area: 399.2 acres.
Is Eagle Lake safe to swim in?
- The letter is not a swimming clearance. Eagle Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Eagle Lake?
- Eagle Lake has a maximum depth of 35 feet. The lake covers 399.2 acres.
What fish are in Eagle Lake?
- Fish species found in Eagle Lake include Black crappie, Blackchin shiner, Blacknose shiner, Bluegill, Bluntnose minnow, Brook silverside, Grass pickerel, Green sunfish, Iowa darter, Largemouth bass, Longnose gar, Northern longear sunfish, Northern pike, Pumpkinseed, Rock bass, Sand shiner, Smallmouth bass, Walleye, Warmouth, Western banded killifish, Yellow bullhead, Yellow perch. Eagle Lake is located in Cass County, Michigan.
Are there boat ramps on Eagle Lake?
- Eagle Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Eagle Lake. Public access is listed as yes.
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Where this data comes from
106 measurements from 1 monitoring station, 2016–2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS106 samples · 2016–2022
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Named boat-access points from the USGS National Boat Ramps inventory