Mullett Lake is a mesotrophic lake in Cheboygan County, Michigan. Water quality is graded B based on 1 sampling years through 2022. The lake supports 23 documented fish species including Alewife, Blackchin shiner, and Blacknose shiner. Public access is available with 2 public boat landings. Compared to the 6 other monitored lakes in Cheboygan County, Mullett Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-08-24. Grade methodology: LakeGrade methodology.
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Mullett Lake Water Quality Report Card (2026)
A printable one-page report card for Mullett Lake: grade, clarity, phosphorus, algae, multi-year trend, depth, and fish — with sources.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 13 ft. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Mullett Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Mullett Lake
Recreation & Access
Current Conditions
Latest reading Jul 6, 2026, 5:15 AM from USGS gauge 04129950. See live data ↗ — readings update every 15–60 minutes; this page refreshes on each build.
Location & Depth Map
Free interactive depth-contour map of Mullett Lake, reaching a maximum surveyed depth of 120 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #6 of 7 lakes in Cheboygan County
Cleaner Lakes Within 30 Miles
Mullett Lake holds Grade B. 2 nearby lakes hold higher grades.
Nearby Lakes in Cheboygan County
Explore Mullett Lake across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Cheboygan County
Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its grade
Moderate nutrients, good water quality
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Grade B Lakes in Michigan
Charlevoix County · Clarity: 13.3 ft
Charlevoix County · Clarity: 11.5 ft
Otsego County · Clarity: 10.5 ft
Montmorency County · Clarity: 13 ft
Charlevoix County · Clarity: 10 ft
Kalkaska County · Clarity: 12.5 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
EPA Impairment Status
Mullett 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 MI040700040403-06 · Official waterbody report
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
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: 2022-08-24
Monitoring stations: 1