Devils Lake is a mesotrophic lake in Lenawee County, Michigan. Water quality is graded B based on 1 sampling years through 2022. Water clarity is improving over recent sampling years. The lake supports 27 documented fish species including Blackchin shiner, Blacknose shiner, and Bluegill. Public access is available with 1 public boat landing. Compared to the 7 other monitored lakes in Lenawee County, Devils Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-21. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 10.8 ft. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.8 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Devils Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Devils Lake
Water Quality Trend: → Stable
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +2.085 m/yr | 3 |
| Chlorophyll-a | ↓ Declining | +0.5 µg/L/yr | 3 |
Recreation & Access
Location & Depth Map
Free interactive depth-contour map of Devils Lake, reaching a maximum surveyed depth of 63 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #5 of 8 lakes in Lenawee County
Cleaner Lakes Within 30 Miles
Devils Lake holds Grade B. 2 nearby lakes hold higher grades.
Nearby Lakes in Lenawee County
Explore Devils Lake across LakeGrade
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Fish species and best lakes in Lenawee County
Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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More records, surveys & data sources
EPA Impairment Status
Devils Lake 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 MI041000060101-02 · 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 Devils Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Rollin-Woodstock WwtpAddison · 3.1 mi away · NPDES MI0027669Recent violation
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
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2022-09-21
Monitoring stations: 1