Forty Acre Pond Dam
Forty Acre Pond Dam is an earth dam located in Auglaize County, Ohio, built in 1840. It carries a Low hazard potential classification and has a poor condition assessment.
About Forty Acre Pond Dam
The primary purpose of Forty Acre Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Odnr, Division Of Parks & Watercraft (state). It impounds the Miami & Erie Canal near St. Marys.
The dam stands 15 feet tall and stretches 11,100 feet across, creates a reservoir covering 68 acres, has a maximum storage capacity of 492 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1840, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. 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 12/04/2024.
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Location
| State | Ohio |
| County | Auglaize |
| Nearest City | St. Marys |
| River/Stream | Miami & Erie Canal |
| Coordinates | 40.58278, -84.39000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 11,100 ft |
| Year Completed | 1840 (186 years old) |
Storage & Hydraulics
| NID Storage | 492 acre-ft |
| Max Storage | 492 acre-ft |
| Normal Storage | 270 acre-ft |
| Surface Area | 68 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 809 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | ODNR, Division of Parks & Watercraft |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 12/04/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OH00582 |
| Federal ID | OH00582 |
| More Info | State Dam Safety Program |