O'Shaughnessy Reservoir Lake
Delaware County, OhioView mapDirections
Ohio EPA publishes the water-quality measurements for O'Shaughnessy Reservoir Lake. Here is what has been measured.
- Hypereutrophic
- 48 ft max depth
- Public access
- Limited data
O'Shaughnessy Reservoir Lake in Delaware County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 157 µg/L. Chlorophyll-a (algae): 49.3 µg/L.
O'Shaughnessy Reservoir Lake is a highly nutrient-loaded hypereutrophic lake in Delaware County, Ohio with an estimated average depth of about 48 feet. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 3 other monitored lakes in Delaware County, O'Shaughnessy Reservoir Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Ohio EPA, last sampled 2024-09-09. Methodology: how these readings are compared.
What O'Shaughnessy Reservoir Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
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 O'Shaughnessy Reservoir Lake 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 O'Shaughnessy Reservoir Lake
These are the measurements Ohio EPA publishes for O'Shaughnessy Reservoir Lake, 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 157 µg/L. Chlorophyll-a 49.3 µg/L. TSI 73.
| 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 | 157µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 49.3µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 73 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about O'Shaughnessy Reservoir Lake
Answers come straight from the public measurements and survey records on this page.
→ O'Shaughnessy Reservoir Lake water level: the live USGS gauge reading
Lake Details
Max depth
~48 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 O'Shaughnessy Reservoir Lake.
Lake Size & Watershed
Watershed (drainage) area
1,043 sq mi
HydroLAKES / HydroSHEDS
Surface area
689 acres
HydroLAKES / HydroSHEDS
Shoreline
13 mi
HydroLAKES / HydroSHEDS
Elevation
843 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
- O'Shaughnessy Reservoir - Leatherlips Yacht ClubPublic
- O'Shaughnessy Reservoir - Two Lakes WestPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near O'Shaughnessy Reservoir Lake
Compare lakeside cabins, hotels, and vacation rentals near O'Shaughnessy Reservoir Lake in Delaware County, Ohio — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around O'Shaughnessy Reservoir Lake are listed below.
Top-rated places to stay near O'Shaughnessy Reservoir Lake
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Fishing O'Shaughnessy Reservoir Lake
Nearby Lakes in Delaware County
Frequently asked questions about O'Shaughnessy Reservoir Lake
Where is O'Shaughnessy Reservoir Lake?
- O'Shaughnessy Reservoir Lake is a lake in Delaware County, Ohio. Its water-quality measurements are published by Ohio EPA and shown on this page as reported.
What is the water quality of O'Shaughnessy Reservoir Lake?
- O'Shaughnessy Reservoir Lake in Delaware County, Ohio has water-quality measurements published by Ohio EPA, shown here as reported. Phosphorus: 157 µg/L. Chlorophyll-a (algae): 49.3 µg/L.
Is O'Shaughnessy Reservoir Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is O'Shaughnessy Reservoir Lake?
- No published bathymetric survey covers O'Shaughnessy Reservoir Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 48 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 O'Shaughnessy Reservoir Lake?
- O'Shaughnessy Reservoir Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include O'Shaughnessy Reservoir - Leatherlips Yacht Club, O'Shaughnessy Reservoir - Two Lakes West. Public access is listed as yes.
Can I fish at O'Shaughnessy Reservoir Lake?
- O'Shaughnessy Reservoir Lake has 2 documented boat landings 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 O'Shaughnessy Reservoir Lake across LakeQuality
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Where this data comes from
29 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_WQX29 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 (1)
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