Ogemaw County, Michigan · Water Quality Report Card
Au Sable Lake East Central Basin
Au Sable Lake East Central Basin in Ogemaw County, Michigan has a water quality grade of A (Excellent). Water clarity: 10.5 ft visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 3.3 µg/L.
- Clarity
- 10.5 ft
- Mean depth
- ~13 ft est.
- Type
- Mesotrophic
- Trend
- ↑ Improving
Au Sable Lake East Central Basin is a mesotrophic lake in Ogemaw County, Michigan with an estimated average depth of about 13 feet. Water quality is graded A based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-09. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Good clarity, visible to about 10.5 ft. Phosphorus level: 10 µg/L. Chlorophyll-a: 3.3 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | |
| Phosphorus | 10 µg/L | |
| Chlorophyll-a (Algae) | 3.3 µg/L | Good |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~13 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Michigan has not published bathymetry for Au Sable Lake East Central Basin.
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Fishing Au Sable Lake East Central Basin
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 |
| Phosphorus | ↑ Improving | -4 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -0.3 µg/L/yr | 2 |
Location
County Ranking
Ranked #1 of 1 lakes in Ogemaw County
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Other Grade A Lakes in Michigan
Iosco County · 12 ft
Alcona County · 10.5 ft
Alpena County · 16 ft
Montmorency County · 10 ft
Gladwin County · 13.2 ft
Montmorency County · 13 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Where this data comes from
34 measurements from 1 monitoring station, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
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)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2023-09-09
Monitoring stations: 1