Lock

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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. 8 (Armstrong County, Pennsylvania)
Allegheny River Lock and Dam No. 9 (Armstrong County, Pennsylvania)
Bayou Plaquemine Lock (Iberville Parish, Louisiana)
Brown's Lock and Mill Dam #1 (Warren County, Kentucky)
Navigational lock and low level dam on Big Barren River
Cascade Locks (Hood River County, Oregon)
Site of former lock and portage around the rapids on the Columbia
Cedars Lock and Dam Historic District (Outagamie County, Wisconsin)
One of 17 locks on the Lower Fox River
Chicago RIver Lake Michigan Lock (Cook County, Illinois)
Davis Island Lock and Dam Site (Allegheny County, Pennsylvania)
De Pere Lock and Dam Historic District (Brown County, Wisconsin)
Original lock built 1836; Modern lock built 1936
Farmington Canal Lock #12 (New Haven County, Connecticut)
The best preserved lock on the canal. Restored and functional.
Farmington Canal Lock #13 (New Haven County, Connecticut)
Henry Lock & Dam on Illinois River @ Henry, IL (Marshall County, Illinois)
abandoned lock & dam on Illinois River @ Henry, IL
Kaukauna Locks Historic District (Outagamie County, Wisconsin)
Series of 5 locks that provide over fifty feet of lift on the Fox River
Keokuk Lock and Dam (Lee County, Iowa)
Lamourie Lock (Rapides Parish, Louisiana)
Little Chute Locks and Canal Historic District (Outagamie County, Wisconsin)
One of 17 locks on the Lower Fox and a Control Lock to regulate the navigation channel
Little Kaukauna Lock and Dam Historic District (Brown County, Wisconsin)
Originally opened for navigation in 1856, this is one of 17 locks on the Lower Fox River
Lock No. 26 (Summit County, Ohio)
A lock on the Ohio & Erie Canal
Lock No. 27 (Summit County, Ohio)
Lock on the Ohio & Erie canal
Lock No. 28 (Summit County, Ohio)
A lock on the Ohio & Erie Canal
Lock No. 29 and Aqueduct (Summit County, Ohio)
Lock No. 31 (Summit County, Ohio)
Lock No. 32 (Summit County, Ohio)
Lock No. 33 (Summit County, Ohio)
Lock No. 34 (Summit County, Ohio)
A lock on the Ohio & Erie Canal.
Lock No. 35 (Summit County, Ohio)
Lock No. 37 and Spillway (Cuyahoga County, Ohio)
Lock No. 38 and Spillway (Cuyahoga County, Ohio)
Lock No. 39 and Spillway (Cuyahoga County, Ohio)
Locks No. 20 Through 25 (Summit County, Ohio)
Ohio and Erie Canal locks along the Cuyahoga River.
Mayo's Bar Lock and Dam (Floyd County, Georgia)
Meeker Island Lock and Dam (Hennepin County, Minnesota)
Menasha Lock (Winnebago County, Wisconsin)
First of the Lower Fox River Locks leading to Green Bay
Merrill Lock No. 6 (Beaver County, Pennsylvania)
Millville Lock (Worcester County, Massachusetts)
Best preserved lock on the Blackstone Canal
Ohio River Lock and Dam No. 31 Grounds and Buildings (Lewis County, Kentucky)
Ouachita River Lock and Dam No. 8 (Calhoun County, Arkansas)
Rapide Croche Lock and Dam Historic District (Outagamie County, Wisconsin)
Eighth lock and dam upriver from Green Bay
Songo Lock (Cumberland County, Maine)
Yamhill River Lock and Dam (Yamhill County, Oregon)