Osterhout Lake is a mesotrophic lake in Allegan County, Michigan. Water quality is graded C based on 1 sampling years through 2022. Overall water quality is improving over recent sampling years. Compared to the 11 other monitored lakes in Allegan County, Osterhout Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-14. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 9 ft. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Osterhout Lake
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Fishing Osterhout Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.97 m/yr | 3 |
Location & Depth Map
Free interactive depth-contour map of Osterhout Lake, reaching a maximum surveyed depth of 30 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #7 of 12 lakes in Allegan County
Cleaner Lakes Within 30 Miles
Osterhout Lake holds Grade C. One nearby lake has a higher grade.
Nearby Lakes in Allegan County
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Moderate nutrients, good water quality
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Other Grade C Lakes in Michigan
Van Buren County · Clarity: 9.5 ft
Van Buren County · Clarity: 9.5 ft
Van Buren County · Clarity: 7.8 ft
Van Buren County · Clarity: 8 ft
Van Buren County · Clarity: 8.3 ft
Van Buren County · Clarity: 8 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
Most recent sample: 2022-09-14
Monitoring stations: 1