Allegheny River Lock And Dam 2
Allegheny River Lock And Dam 2 is a gravity dam located in Allegheny County, Pennsylvania, built in 1934. It carries a Significant hazard potential classification.
About Allegheny River Lock And Dam 2
The primary purpose of Allegheny River Lock And Dam 2 is navigation. The dam maintains water levels sufficient for boat and barge traffic, supporting commercial or recreational navigation on the waterway. The dam is owned by Usace - Pittsburgh District (federal). It impounds the Allegheny River near Sharpsburg.
The dam stands 58 feet tall and stretches 1,473 feet across, creates a reservoir covering 1,120 acres, has a maximum storage capacity of 14,500 acre-feet, and collects water from a drainage area of 11,636 square miles. Completed in 1934, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 11/06/2023.
At 58 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Pennsylvania |
| County | Allegheny |
| Nearest City | Sharpsburg |
| River/Stream | Allegheny River |
| Coordinates | 40.48792, -79.91460 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 58 ft |
| Dam Length | 1,473 ft |
| Year Completed | 1934 (92 years old) |
Storage & Hydraulics
| NID Storage | 14,500 acre-ft |
| Max Storage | 14,500 acre-ft |
| Normal Storage | 14,500 acre-ft |
| Surface Area | 1,120 acres |
| Drainage Area | 11,636 sq mi |
| Max Discharge | 200,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Navigation |
| Owner | USACE - Pittsburgh District |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 11/06/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA00112 |
| Federal ID | PA00112 |
| More Info | State Dam Safety Program |