Greenwich Reservoir Dam
Greenwich Reservoir Dam is an earth dam located in Huron County, Ohio, built in 1921. It carries a High hazard potential classification and has a poor condition assessment.
About Greenwich Reservoir Dam
The primary purpose of Greenwich Reservoir Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Village Of Greenwich (local government). It impounds the Tributary To Southwest Branch Vermilion River near Greenwich.
The dam stands 20 feet tall and stretches 700 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 79 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1921, the structure is over a century old.
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 05/27/2021.
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 | Huron |
| Nearest City | Greenwich |
| River/Stream | Tributary To Southwest Branch Vermilion River |
| Coordinates | 41.02639, -82.51583 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 700 ft |
| Year Completed | 1921 (105 years old) |
Storage & Hydraulics
| NID Storage | 79 acre-ft |
| Max Storage | 79 acre-ft |
| Normal Storage | 46 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,106 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Village of Greenwich |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 05/27/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH00217 |
| Federal ID | OH00217 |
| More Info | State Dam Safety Program |