Wilmington Upground Reservoir No. 1
Wilmington Upground Reservoir No. 1 is an earth dam located in Clinton County, Ohio, built in 1945. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Wilmington Upground Reservoir No. 1
The primary purpose of Wilmington Upground Reservoir No. 1 is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Wilmington (local government). It impounds the Offstream near Burtonville.
The dam stands 19 feet tall and stretches 3,570 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 371 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1945, the structure is well-established, with more than 75 years of service.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 04/24/2024.
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 | Clinton |
| Nearest City | Burtonville |
| River/Stream | Offstream |
| Coordinates | 39.40917, -83.81667 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 3,570 ft |
| Year Completed | 1945 (81 years old) |
Storage & Hydraulics
| NID Storage | 371 acre-ft |
| Max Storage | 371 acre-ft |
| Normal Storage | 307 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Wilmington |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/24/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH00764 |
| Federal ID | OH00764 |
| More Info | State Dam Safety Program |