Heishmans Mill
Heishmans Mill is a concrete dam located in Cumberland County, Pennsylvania, built in 1815. It carries a Low hazard potential classification.
About Heishmans Mill
The primary purpose of Heishmans Mill is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by William Foshag (private). It impounds the Conodoguinet Creek.
The dam stands 10 feet tall and stretches 140 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 80 acre-feet, and collects water from a drainage area of 310 square miles. Completed in 1815, 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. The most recent inspection on record was 05/17/2018.
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Location
| State | Pennsylvania |
| County | Cumberland |
| River/Stream | Conodoguinet Creek |
| Coordinates | 40.21333, -77.31500 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 140 ft |
| Year Completed | 1815 (211 years old) |
Storage & Hydraulics
| NID Storage | 80 acre-ft |
| Max Storage | 80 acre-ft |
| Normal Storage | 80 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 310 sq mi |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | WILLIAM FOSHAG |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 05/17/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | PA01730 |
| Federal ID | PA01730 |
| More Info | State Dam Safety Program |