[2] It crosses the Allegheny River between the Pittsburgh neighborhood of Highland Park and the suburb of Aspinwall.

It is the most-used lock operated by the United States Army Corps of Engineers.

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.

Downriver is the Pittsburgh Pool with an average water elevation of 710 feet above sea level.

[5] The Pittsburgh Pool encompasses over 24 Miles of navigable water at about 710 feet of elevation.