Glass Rock Lake Dam
Glass Rock Lake Dam is an earth dam located in Perry County, Ohio. It carries a High hazard potential classification and has a poor condition assessment.
About Glass Rock Lake Dam
The primary purpose of Glass Rock Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Thornville Property Management (private). It impounds the Tributary To Jonathan Creek near East Fultonham.
The dam stands 54 feet tall and stretches 970 feet across, creates a reservoir covering 47 acres, has a maximum storage capacity of 825 acre-feet, and collects water from a drainage area of 0 square miles.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 11/09/2023.
At 54 feet, this dam is taller than 94% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Ohio dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Ohio |
| County | Perry |
| Nearest City | East Fultonham |
| River/Stream | Tributary To Jonathan Creek |
| Coordinates | 39.88083, -82.28611 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 54 ft |
| Dam Height | 54 ft |
| Dam Length | 970 ft |
Storage & Hydraulics
| NID Storage | 825 acre-ft |
| Max Storage | 825 acre-ft |
| Normal Storage | 470 acre-ft |
| Surface Area | 47 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 4,448 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Thornville Property Management |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 11/09/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH00661 |
| Federal ID | OH00661 |
| More Info | State Dam Safety Program |