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Allegheny River Lock and Dam No. 2
U.S. National Register of Historic Places
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Location	7451 Lockway W, Pittsburgh, Pennsylvania
Coordinates	40°29′24″N 79°54′51″W / 40.49000°N 79.91417°W / 40.49000; -79.91417
Area	8.8 acres (3.6 ha)
Built	1932
Architect	Vang Construction Company
MPS	Allegheny River Navigation System MPS
NRHP reference No.	00000396
Added to NRHP	April 21, 2000

The Allegheny River Lock and Dam No. 2 (also known as the Highland Park Lock and Dam) in Pittsburgh, Pennsylvania is a lock and fixed-crest dam from 1932. It crosses the Allegheny River between the Pittsburgh neighborhood of Highland Park and the suburb of Aspinwall. 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 is the most-used lock operated by the United States Army Corps of Engineers.

Lock and Dam No. 2 is located about 6.7 Miles up the Allegheny River from the Point in Downtown Pittsburgh. Upriver from the dam, Allegheny Pool No. 2 has an average water elevation of 721 feet above sea level and extends about 7.8 miles upriver to Allegheny River Lock and Dam No. 3. Downriver is the Pittsburgh Pool with an average water elevation of 710 feet above sea level. Thus Lock No. 2 lifts and lowers boats about 11 feet between the pools.

The Pittsburgh Pool encompasses over 24 Miles of navigable water at about 710 feet of elevation. It stretches about 6.2 Miles up the Ohio River from the Emsworth Locks and Dam, 11.2 Miles up the Monongahela River to the Braddock Locks & Dam, and 6.7 Miles up the Allegheny.

The Highland Park Bridge crosses the river just above the dam. 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. March 13, 2009.
2. "Lock & Dam 2, Allegheny River". www.lrp.usace.army.mil. Retrieved 2018-07-18.
3. "Allegheny River Lock and Dam Two". Geographic Names Information System. 1990-08-30. Retrieved 2010-09-22.
4. Santoni, Matthew (2010-09-14). "Corps shuts Highland Park lock for two weeks of repairs". Pittsburgh Tribune-Review. Trib Total Media. Archived from the original on 2012-09-08. Retrieved 2010-09-14.
5. "Allegheny River Navigation Charts Allegheny River Navigation Charts" (PDF). army.mil. January 2004. Retrieved 10 April 2023.

Crossings of the Allegheny River
Upstream Highland Park Bridge Allegheny River Lock and Dam No. 2 Downstream Senator Robert D. Fleming Bridge

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• Locks on the National Register of Historic Places in Pennsylvania
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• Transport infrastructure completed in 1932
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• Dams on the Allegheny River
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