Allegheny River Lock and Dam No. 4

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Allegheny River Lock and Dam No. 4
Allegheny River Lock and Dam No.4.jpg
Allegheny River Lock and Dam No. 4 is located in Pennsylvania
Allegheny River Lock and Dam No. 4
Allegheny River Lock and Dam No. 4 is located in the US
Allegheny River Lock and Dam No. 4
Location 1 River Avenue, Harrison Township, Allegheny County, Pennsylvania
Coordinates 40°36′52″N 79°42′59″W / 40.61444°N 79.71639°W / 40.61444; -79.71639Coordinates: 40°36′52″N 79°42′59″W / 40.61444°N 79.71639°W / 40.61444; -79.71639
Built 1927
Architectural style Moderne
MPS Allegheny River Navigation System MPS[2]
NRHP Reference # 00000398[1]
Added to NRHP April 21, 2000

The Allegheny River Lock and Dam No. 4 in Harrison Township, Allegheny County, Pennsylvania, is a lock that was built 1920-1927, and opened in 1927, 24.2 miles upstream from the mouth of the river in Pittsburgh.[2] 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 has a single lock and a fixed crest dam, keeping the river depth at least 9 feet in the pool above the dam. The amount of water that flows over the dam is not controlled locally, so it does not provide flood control, but it does help provide water to municipalities.[3]

Traffic through the lock was about 1.8 million tons in 1998, including shipments of coal, petroleum, sand and gravel, ore, steel, chemicals, fertilizer, salt, flour, lime, and slag.[2]

It was listed on the National Register of Historic Places on April 21, 2000.[1]

References[edit]

  1. ^ a b National Park Service (2009-03-13). "National Register Information System". National Register of Historic Places. National Park Service. 
  2. ^ a b c Dinsmore, Douglas (1998). Allegheny River Navigation System MPS "Historic Resources of the Allegheny River Navigation System 1739-1948" Check |url= value (help) (PDF). National Register of Historic Places. National Park Service. Retrieved November 27, 2013. 
  3. ^ "Lock & Dam 4, Allegheny River". U.S. Army Corps of Engineers, Pittsburgh District. Retrieved November 27, 2013.