Mohawk Lake is a 370-acre mesotrophic lake in Oakland County, Michigan. Water quality is graded B based on 1 sampling years through 2023. Compared to the 44 other monitored lakes in Oakland County, Mohawk Lake ranks #26 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-11. 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 11 ft. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 370 acres |
Where to stay near Mohawk Lake
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Fishing Mohawk Lake
Water Temperature
Mohawk Lake averages about 54°F at the surface in summer, usually warmest in Aug (about 56°F) and coldest in May (about 49°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 1,291 field readings (2012–2018) via the EPA Water Quality Portal. See the full Mohawk Lake water temperature breakdown →
Location & Depth Map
Free interactive depth-contour map of Mohawk Lake, reaching a maximum surveyed depth of 33 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #26 of 45 lakes in Oakland County
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Moderate nutrients, good water quality
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Other Grade B Lakes in Michigan
Genesee County · Clarity: 12 ft
Genesee County · Clarity: 12 ft
Genesee County · Clarity: 10 ft
Livingston County · Clarity: 12 ft
Livingston County · Clarity: 12 ft
Genesee County · Clarity: 10 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
Reservoir Info (USACE NID)
Mohawk Lake is a man-made reservoir impounded by the Clintonville Dam (completed 1915), built primarily for recreation on the Clinton River; earth-type dam, 14 ft tall and 200 ft long.
- Surface area
- 370 ac
- Normal storage
- 2,400 ac-ft
- Max storage
- 3,900 ac-ft
- Drainage area
- 0 sq mi
- Hazard class
- Significant
- Owner
- Oakland County Drain Commissioner
Source: USACE National Inventory of Dams, NID ID MI00241 · Operator website · Matched by proximity (0.98 km)
EPA Impairment Status
Mohawk 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 MI040900030103-05 · Official waterbody report · Matched by proximity (0.42 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Mohawk Lake under Clean Water Act (NPDES) discharge permits.
- Mlc-Fiero SitePontiac · 2.9 mi away · NPDES MI0058796
- Gm - Pontiac Sw FacilityPontiac · 3.1 mi away · NPDES MI0058908
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: 2023-09-11
Monitoring stations: 1