Government Shutdown

During the federal government shutdown, this website will not be updated and may not reflect current conditions. Some national parks may remain accessible to visitors; however, access may change without notice. Some parks are closed completely. Some visitor services may be available when provided by concessioners or other entities. For most parks, there will be no National Park Service-provided visitor services, such as restrooms, trash collection, facilities, or road maintenance. For more information, see www.doi.gov/shutdown and the park website.
Allegheny River Lock and Dam No. 4
00000398
Allegheny River Navigation System MPS
EVENT
ARCHITECTURE/ENGINEERING
MODERNE
TRANSPORTATION
MARITIME HISTORY
ECONOMICS
ENGINEERING
1925-1949
1900-1924
499-0 BC
1920
1948
STRUCTURE
National Register of Historic Places Collection
pdf
22151
4/21/2000
National Register of Historic Places
State: Pennsylvania
County: Allegheny County
Natrona ; 1 River Ave.
Historic
022a71d3-8da8-4eca-b262-e8243478d3dd

Allegheny River Lock and Dam No. 4
00000398
Allegheny River Navigation System MPS
EVENT
ARCHITECTURE/ENGINEERING
MODERNE
TRANSPORTATION
MARITIME HISTORY
ECONOMICS
ENGINEERING
1925-1949
1900-1924
499-0 BC
1920
1948
STRUCTURE
National Register of Historic Places Collection
pdf
22151
4/21/2000
National Register of Historic Places
State: Pennsylvania
County: Allegheny County
Natrona ; 1 River Ave.
Historic
1fdc5d10-8772-412f-bd9d-cf2315ac05ba