Marquam Bridge

River mile: 13.5

Opened: October 4, 1966 (lower deck); October 18, 1966 (upper deck)

Type: double-deck steel through cantilever truss

Main Span Length: 440 feet

Center Height to Water: 165 feet (upper deck); 130 feet (lower deck)

Outside Width: 57 feet (four lanes southbound; three lanes northbound)

Color: concrete gray

Cost: $14 million

Owner: Oregon Department of Transportation

Engineer/Designer: Oregon Department of Transportation

Access: no pedestrians or bicycles

Average Daily Traffic: 139,100

Historic American Engineering Record OR-106

Last updated: 19 February 2010.