Allegheny River Lock and Dam 6 is a gravity dam located in Armstrong County, Pennsylvania, built in 1928. It carries a Low hazard potential classification.
Dam profile
NID height · 21 ft21 ft tall and 1,212 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Allegheny River Lock and Dam 6
The primary purpose of Allegheny River Lock and Dam 6 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 Freeport.
The dam stands 21 feet tall and stretches 1,212 feet across, creates a reservoir covering 1,260 acres, has a maximum storage capacity of 14,000 acre-feet, and collects water from a drainage area of 9,332 square miles. Completed in 1928, the structure is well-established, with more than 75 years 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. An emergency action plan is in place for this dam. The most recent inspection on record was 05/02/2023.
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Location
| State | Pennsylvania |
| County | Armstrong |
| Nearest City | Freeport |
| River/Stream | Allegheny River |
| Coordinates | 40.71594, -79.57974 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 21 ft |
| Dam Length | 1,212 ft |
| Year Completed | 1928 (98 years old) |
Storage & Hydraulics
| NID Storage | 14,000 acre-ft |
| Max Storage | 14,000 acre-ft |
| Normal Storage | 14,000 acre-ft |
| Surface Area | 1,260 acres |
| Drainage Area | 9,332 sq mi |
| Max Discharge | 120,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Navigation |
| Owner | USACE - Pittsburgh District |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 05/02/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PA00116 |
| Federal ID | PA00116 |
| More Info | State Dam Safety Program |