Morrison-Knudsen Co.

of Boise, Idaho
View Exhibit map

Alaskan Way Viaduct (King County, Washington)
Contractor, 1953
Double-deck stringer bridge running parallel to Alaskan Way along Seattle waterfront
Demolished 2019

BART/MUNI - Market Street Subway (San Francisco County, California)
Built 1973
Tunnel on Bay Area Rapid Transit & San Francisco Municipal Railway
Open to traffic

BNSF - Flathead Tunnel (Lincoln County, Montana)
Built 1970
Tunnel on BNSF Kootenai River Subdivision
Open to traffic

BNSF - Snake River Bridge (Franklin County, Washington)
Built 1971
Vertical lift bridge over Snake River on Burlington Northern - Santa Fe Railroad
Open to traffic

Broadway Tunnel (San Francisco County, California)
Built 1952
Tunnel carries traffic under corner of Russian Hill and several streets. Four lanes of automobile, bus and truck traffic
Open to traffic

Golden Gate Bridge (Park County, Wyoming)
Built 1933
Lost Stringer bridge over Ravine on Grand Loop Road
Replaced by a new bridge

Maple Street Bridge (Spokane County, Washington)
Contractor, 1958
Girder bridge over Spokane River on Maple Street
Open to traffic

NWP - Island Mountain Bridge (1965) (Trinity County, California)
Built 1965
Warren through truss bridge over Eel River on Northwestern Pacific Railroad
Closed to all traffic

Oregon Trail Memorial Bridge (Ada County, Idaho)
Built 1931
Concrete arch bridge over Boise River on Capital Boulevard in Boise
Open to traffic

South Fork Tuolumne River Bridge (Tuolumne County, California)
Built 1937
Steel stringer bridge over South Fork Tuolumne River on Tioga Road
Open to traffic

UP - Bootlegger Tunnel (Grand County, Utah)
Built 1962
Tunnel under hillside on UP RR
Open to traffic

UP - Lucin Cutoff (Box Elder County, Utah)
Built 1958
Concrete rigid frame bridge over Great Salt Lake on UP Railroad
Open to traffic