Marysville Upground Reservoir
Marysville Upground Reservoir is an earth dam located in Union County, Ohio, built in 2009. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Marysville Upground Reservoir
The primary purpose of Marysville 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 Marysville (local government). It impounds the Offstream.
The dam stands 48 feet tall and stretches 11,155 feet across, creates a reservoir covering 114 acres, has a maximum storage capacity of 4,634 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2009, 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 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 11/19/2020.
At 48 feet, this dam is taller than 92% 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 | Union |
| River/Stream | Offstream |
| Coordinates | 40.26333, -83.40167 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 48 ft |
| Dam Height | 48 ft |
| Dam Length | 11,155 ft |
| Year Completed | 2009 (17 years old) |
Storage & Hydraulics
| NID Storage | 4,634 acre-ft |
| Max Storage | 4,634 acre-ft |
| Normal Storage | 4,173 acre-ft |
| Surface Area | 114 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Marysville |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/19/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH03166 |
| Federal ID | OH03166 |
| More Info | State Dam Safety Program |