Findlay Reservoir
Hancock County, OhioView mapDirections
Ohio EPA publishes the water-quality measurements for Findlay Reservoir. Here is what has been measured.
- Mesotrophic
- 36 ft max depth
- Public access
- Limited data
Findlay Reservoir in Hancock County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 40.3 µg/L. Chlorophyll-a (algae): 4.4 µg/L.
Findlay Reservoir is a mesotrophic lake in Hancock County, Ohio with an estimated average depth of about 36 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2024-09-23. Methodology: how these readings are compared.
What Findlay Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Findlay Reservoir is safe to swim in today is a call for the Ohio Environmental Protection Agency and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Findlay Reservoir
These are the measurements Ohio EPA publishes for Findlay Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 40.3 µg/L. Chlorophyll-a 4.4 µg/L. TSI 51.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 40.3µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 4.4µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 51 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Findlay Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~36 ft est.
Public access
Yes
Listed by Ohio EPA
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Ohio has not published bathymetry for Findlay Reservoir.
Lake Size & Watershed
Watershed (drainage) area
27 sq mi
HydroLAKES / HydroSHEDS
Surface area
806 acres
HydroLAKES / HydroSHEDS
Shoreline
4.4 mi
HydroLAKES / HydroSHEDS
Elevation
791 ft
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.
Recreation & Access
- Findlay Reservoir No. 1Public
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Fishing Findlay Reservoir
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Frequently asked questions about Findlay Reservoir
Where is Findlay Reservoir?
- Findlay Reservoir is a lake in Hancock County, Ohio. Its water-quality measurements are published by Ohio EPA and shown on this page as reported.
What is the water quality of Findlay Reservoir?
- Findlay Reservoir in Hancock County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 40.3 µg/L. Chlorophyll-a (algae): 4.4 µg/L.
Is Findlay Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Findlay Reservoir?
- No published bathymetric survey covers Findlay Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 36 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Findlay Reservoir?
- Findlay Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Findlay Reservoir No. 1. Public access is listed as yes.
Can I fish at Findlay Reservoir?
- Findlay Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Ohio's fish and wildlife agency, so check its current regulations before you go.
Explore Findlay Reservoir across LakeQuality
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory