Corps of Engineers

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Allegheny River Lock and Dam No. 6 (Armstrong County, Pennsylvania)
Davis Island Lock and Dam Site (Allegheny County, Pennsylvania)
Diversion Tunnel (Kenai Peninsula Borough, Alaska)
Fort Peck Dam (Valley County, Montana)
Fort Warren (Suffolk County, Massachusetts)
South Bass Island Light (Ottawa County, Ohio)
St. Mary's Falls Canal (Chippewa County, Michigan)