Au Sable Lake
Ogemaw County, Michigan269 acresView mapDirections
EGLE publishes the water-quality measurements for Au Sable Lake. Here is what has been measured.
- Mesotrophic
- 52 ft max depth
- Public access
Ask about Au Sable Lake
Answers come straight from the public measurements and survey records on this page.
Au Sable Lake in Ogemaw County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 10.5 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 3.3 µg/L. Maximum depth: 52 ft. Surface area: 268.7 acres.
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Au Sable Lake is a 269-acre mesotrophic lake in Ogemaw County, Michigan with a maximum depth of 52 feet. Water clarity is improving over recent sampling years. The lake supports 11 documented fish species including Bluegill, Bluntnose minnow, and Iowa darter. Public access is available. 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, EGLE, last sampled 2023-09-09. Grade methodology: LakeQuality methodology.
What Au Sable Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.5 ft of visibility
- Fishing11 species recorded
- Deep water52 ft surveyed max depth
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Au Sable Lake is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Au Sable Lake
These are the measurements EGLE publishes for Au Sable Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 10.5 ft. Phosphorus 10 µg/L. Chlorophyll-a 3.3 µg/L. TSI 41.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | Measured, not scored |
| Phosphorus | 10 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | 3.3 µg/L | Good |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 52 ft |
| Surface Area | 269 acres |
| Public Access | Yes |
Fish Species
Click a species to see every lake where it is documented.
Fishing Au Sable Lake
Water Quality Trend: → Stable
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.718 m/yr | 3 |
| Phosphorus | → Stable | -0.06 µg/L/yr | 3 |
| Chlorophyll-a | ↓ Declining | +0.23 µg/L/yr | 3 |
Nearby Lakes in Ogemaw County
Frequently asked questions about Au Sable Lake
Where is Au Sable Lake?
- Au Sable Lake is a lake in Ogemaw County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Au Sable Lake?
- Au Sable Lake in Ogemaw County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 10.5 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 3.3 µg/L. Maximum depth: 52 ft. Surface area: 268.7 acres.
Is Au Sable Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Au Sable Lake?
- Au Sable Lake has a maximum depth of 52 feet. The lake covers 268.7 acres.
What fish are in Au Sable Lake?
- Fish species found in Au Sable Lake include Bluegill, Bluntnose minnow, Iowa darter, Johnny darter, Largemouth bass, Least darter, Northern longear sunfish, Pumpkinseed, Rock bass, Western banded killifish, Yellow perch. Au Sable Lake is located in Ogemaw County, Michigan.
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Where this data comes from
34 measurements from 1 monitoring station, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS34 samples · 2022–2023
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.