Au Sable Lake is a mesotrophic lake in Ogemaw County, Michigan. Water quality is graded B based on 1 sampling years through 2022. Overall water quality is improving over recent sampling years. The lake supports 11 documented fish species including Bluegill, Bluntnose minnow, and Iowa darter. Public access is available with 1 public boat landing. Compared to the 1 other monitored lakes in Ogemaw County, Au Sable Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-20. 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 ft. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Au Sable Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Au Sable Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +4.27 m/yr | 2 |
| Chlorophyll-a | ↑ Improving | -0.3 µg/L/yr | 2 |
Recreation & Access
Location & Depth Map
Free interactive depth-contour map of Au Sable Lake, reaching a maximum surveyed depth of 52 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #2 of 2 lakes in Ogemaw County
Cleaner Lakes Within 30 Miles
Au Sable Lake holds Grade B. 3 nearby lakes hold higher grades.
Nearby Lakes in Ogemaw County
Explore Au Sable Lake across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Ogemaw County
Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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Other Grade B Lakes in Michigan
Iosco County · Clarity: 13 ft
Iosco County · Clarity: 12 ft
Oscoda County · Clarity: 14.5 ft
Alcona County · Clarity: 10.5 ft
Montmorency County · Clarity: 13 ft
Crawford County · Clarity: 6.5 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
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
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: 2022-09-20
Monitoring stations: 1