Defiance Upground Reservoir
Defiance Upground Reservoir is an earth dam located in Defiance County, Ohio, built in 2007. It carries a High hazard potential classification and has a fair condition assessment.
About Defiance Upground Reservoir
The primary purpose of Defiance Upground Reservoir 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 Defiance (local government). It impounds the Unnamed Tributary To Auglaize River.
The dam stands 24 feet tall and stretches 7,800 feet across, has a maximum storage capacity of 1,587 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2007, the structure is relatively new.
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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 04/26/2022.
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 | Defiance |
| River/Stream | Unnamed Tributary To Auglaize River |
| Coordinates | 41.26667, -84.39583 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 7,800 ft |
| Year Completed | 2007 (19 years old) |
Storage & Hydraulics
| NID Storage | 1,587 acre-ft |
| Max Storage | 1,587 acre-ft |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Defiance |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 04/26/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH03143 |
| Federal ID | OH03143 |
| More Info | State Dam Safety Program |