Hancock County, Ohio · Water Quality Report Card
Findlay Reservoir
Findlay Reservoir in Hancock County, Ohio has a water quality grade of C (Fair). Phosphorus: 40.3 µg/L. Chlorophyll-a (algae): 4.4 µg/L.
- Mean depth
- ~24 ft est.
- Type
- Mesotrophic
Findlay Reservoir is a mesotrophic lake in Hancock County, Ohio with an estimated average depth of about 24 feet. Water quality is graded C based on 2 sampling years through 2024.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2024-09-23. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 40.3 µg/L. Chlorophyll-a: 4.4 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 40.3 µg/L | Fair |
| Chlorophyll-a (Algae) | 4.4 µg/L | Good |
| Trophic State Index (TSI) | 51 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~24 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Ohio has not published bathymetry for Findlay Reservoir.
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Fishing Findlay Reservoir
Location
County Ranking
Ranked #1 of 1 lakes in Hancock County
Nearby Lakes in Hancock County
Explore Findlay Reservoir across LakeGrade
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Other Grade C Lakes in Ohio
Mesotrophic 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
99 measurements from 2 monitoring stations, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Division of Surface water (Ohio)
21OHIO_WQX99 samples · 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 (2)
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: 2024-09-23
Monitoring stations: 2