Morrison-Knudsen Co.
of Boise, Idaho
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Alaskan Way Viaduct (King County, Washington)
Contractor, 1953Double-deck stringer bridge running parallel to Alaskan Way along Seattle waterfrontDemolished 2019
BNSF - Flathead Tunnel (Lincoln County, Montana)
Built 1970Tunnel on BNSF Kootenai River SubdivisionOpen to traffic
BNSF - Snake River Bridge (Franklin County, Washington)
Built 1971Vertical lift bridge over Snake River on Burlington Northern - Santa Fe RailroadOpen to traffic
Broadway Tunnel (San Francisco County, California)
Built 1952Tunnel carries traffic under corner of Russian Hill and several streets. Four lanes of automobile, bus and truck trafficOpen to traffic
Golden Gate Bridge (Park County, Wyoming)
Built 1933Lost Stringer bridge over Ravine on Grand Loop RoadReplaced by a new bridge
Maple Street Bridge (Spokane County, Washington)
Contractor, 1958Girder bridge over Spokane River on Maple StreetOpen to traffic
Oregon Trail Memorial Bridge (Ada County, Idaho)
Built 1931Concrete arch bridge over Boise River on Capital Boulevard in BoiseOpen to traffic
UP - Lucin Cutoff (Box Elder County, Utah)
Built 1958Concrete rigid frame bridge over Great Salt Lake on UP RailroadOpen to traffic