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Allegheny River Lock and Dam No. 9
U.S. National Register of Historic Places
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Location	Terminus of PA 1004, 0.2 mi. N of T488, Madison Township, Pennsylvania and Washington Township, Pennsylvania
Coordinates	40°57′17″N 79°32′50″W / 40.95472°N 79.54722°W / 40.95472; -79.54722
Area	59.5 acres (24.1 ha)
Built	1935-1938
Built by	York Engineering & Construction
Architectural style	Late 19th And 20th Century Revivals
MPS	Allegheny River Navigation System MPS
NRHP reference No.	00000403
Added to NRHP	April 21, 2000

Allegheny River Lock and Dam No. 9 is a historic lock and fixed-crest dam complex located at Madison Township and Washington Township in Armstrong County, Pennsylvania. It was built between 1935 and 1938 by the United States Army Corps of Engineers, and includes the lock, dam, steel miter gates, and Operations Building. The lock measures 56 feet by 360 feet, and has a lift of 22 feet. The dam measures approximately 60 feet high and 918 feet long. The Operations Building, or powerhouse, is a utilitarian two-story building in a vernacular early-20th century revival style. The lock and dam were built by the U.S. Army Corps of Engineers as a part of an extensive system of locks and dams to improve navigation along the Allegheny River.

It was listed on the National Register of Historic Places in 2000.

References

1. ^ "National Register Information System". National Register of Historic Places. National Park Service. July 9, 2010.
2. "Pittsburgh District > Missions > Navigation > Locks and Dams > Lock & Dam 9, Allegheny River". www.lrp.usace.army.mil. Retrieved 2018-07-19.
3. "National Historic Landmarks & National Register of Historic Places in Pennsylvania". CRGIS: Cultural Resources Geographic Information System. Archived from the original (Searchable database) on 2007-07-21. Retrieved 2012-08-25. Note: This includes Douglas Dinsmore (October 1997). "National Register of Historic Places Inventory Nomination Form: Allegheny River Lock and Dam No. 9" (PDF). Retrieved 2012-08-24.

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Category NRHP portal

• Locks on the National Register of Historic Places in Pennsylvania
• Transport infrastructure completed in 1938
• United States Army Corps of Engineers dams
• Buildings and structures in Armstrong County, Pennsylvania
• Dams on the Allegheny River
• National Register of Historic Places in Armstrong County, Pennsylvania
• Dams on the National Register of Historic Places in Pennsylvania
• Transportation buildings and structures in Armstrong County, Pennsylvania
• 1938 establishments in Pennsylvania