Walnut Hills Lake Dam
Walnut Hills Lake Dam is an earth dam located in Warren County, Ohio. It carries a Significant hazard potential classification and has a poor condition assessment.
About Walnut Hills Lake Dam
The primary purpose of Walnut Hills Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mark & Linda Merrell (private). It impounds the Tributary To North Fork near Oregonia.
The dam stands 24 feet tall and stretches 440 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 28 acre-feet, and collects water from a drainage area of 0 square miles.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 05/07/2024.
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Location
| State | Ohio |
| County | Warren |
| Nearest City | Oregonia |
| River/Stream | Tributary To North Fork |
| Coordinates | 39.54667, -84.12111 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 440 ft |
Storage & Hydraulics
| NID Storage | 28 acre-ft |
| Max Storage | 28 acre-ft |
| Normal Storage | 19 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 361 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Mark & Linda Merrell |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 05/07/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | OH00557 |
| Federal ID | OH00557 |
| More Info | State Dam Safety Program |