Ottawa County, Ohio · Water Quality Report Card
Sandusky Bay Spatial Composite Lake
Sandusky Bay Spatial Composite Lake in Ottawa County, Ohio is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 31 µg/L.
- Mean depth
- ~64 ft est.
- Type
- Eutrophic
Sandusky Bay Spatial Composite Lake is a productive, nutrient-rich eutrophic lake in Ottawa County, Ohio with an estimated average depth of about 64 feet.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2024-09-17. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not rated for swimming — there is not enough monitoring data to judge this lake
Water Quality Grade: Not rated
No clarity data. Chlorophyll-a: 31 µg/L. Trophic State Index: 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 31 µg/L | |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~64 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Ohio has not published bathymetry for Sandusky Bay Spatial Composite Lake.
Where to stay near Sandusky Bay Spatial Composite Lake
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Fishing Sandusky Bay Spatial Composite Lake
Location
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Eutrophic Lakes in Ohio
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
10 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Division of Surface water (Ohio)
21OHIO_WQX10 samples · 2024
Analytical methods
- 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: 2024-09-17
Monitoring stations: 1