Lucas County, Ohio · Water Quality Report Card
Maumee Bay Off Maumee Bay State Park Lake
Maumee Bay Off Maumee Bay State Park Lake in Lucas County, Ohio is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 66 µg/L. Chlorophyll-a (algae): 30.6 µg/L.
- Mean depth
- ~64 ft est.
- Type
- Eutrophic
- Trend
- ↑ Improving
Maumee Bay Off Maumee Bay State Park Lake is a productive, nutrient-rich eutrophic lake in Lucas County, Ohio with an estimated average depth of about 64 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2024-09-19. 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. Phosphorus level: 66 µg/L. Chlorophyll-a: 30.6 µg/L. Trophic State Index: 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 66 µg/L | |
| Chlorophyll-a (Algae) | 30.6 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 Maumee Bay Off Maumee Bay State Park Lake.
Where to stay near Maumee Bay Off Maumee Bay State Park Lake
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Fishing Maumee Bay Off Maumee Bay State Park Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -5.77 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -0.69 µg/L/yr | 3 |
Location
Nearby Lakes in Lucas County
Explore Maumee Bay Off Maumee Bay State Park Lake across LakeGrade
More Ohio Lake Rankings
Other Lakes in Ohio
Ottawa County · Not rated
Erie County · Not rated
Morrow County · 3.1 ft
Richland County · 5.2 ft
Ashland County · 0.9 ft
Richland County · 3 ft
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
89 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Division of Surface water (Ohio)
21OHIO_WQX89 samples · 2021–2024
Analytical methods
- Total Phosphorus After Block Digestion
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 2130 B ~ Nephelometric Method
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: 2024-09-19
Monitoring stations: 1