Lock and dam

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Allegheny River Lock and Dam No. 2 (Allegheny County, Pennsylvania)
Allegheny River Lock and Dam No. 3 (Allegheny County, Pennsylvania)
Allegheny River Lock and Dam No. 4 (Allegheny County, Pennsylvania)
Allegheny River Lock and Dam No. 6 (Armstrong County, Pennsylvania)
Allegheny River Lock and Dam No. 7 (Armstrong County, Pennsylvania)
Allegheny River Lock and Dam No. 9 (Armstrong County, Pennsylvania)
Allegheny River Lock and Dam No.8 (Armstrong County, Pennsylvania)
Brown's Lock and Mill Dam #1 (Warren County, Kentucky)
Navigational lock and low level dam on Big Barren River
Davis Island Lock and Dam Site (Allegheny County, Pennsylvania)
Green River Lock and Dam #4 (Butler County, Kentucky)
Ruined Navigational Lock and Facilities of the Green River Slackwater System
Keokuk Lock and Dam (Lee County, Iowa)
Lock and Dam No. 2 (Hennepin County, Minnesota)
Mayo's Bar Lock and Dam (Floyd County, Georgia)
Mississippi River Lock and Dam No. 6 (Trempealeau County, Wisconsin)
Part of the Upper Mississippi 9 Foot Navigation Project
Ohio River Lock and Dam No. 31 Grounds and Buildings (Lewis County, Kentucky)
Ouachita River Lock and Dam No. 8 (Calhoun County, Arkansas)
Yamhill River Lock and Dam (Yamhill County, Oregon)