Type: Fixed Double Deck Continuous Steel Truss
At mile marker: 13.5
Overall length: 1043'-8"
Owner: State Of Oregon

Bridge History:

Designed by the Oregon State Highway Department Bridge Section, the Marquam is a through-truss fixed bridge with a suspended cantilever center span. It opened in 1966 as an element of Portland's Interstate Transportation System and was the city's first double-deck highway bridge built exclusively for vehicular traffic.

It was named for Philip Marquam, a 19th century transportation advocate. It's strictly functional appearance engendered, ironically, an outcry for public participation in future bridge designs and periodic discussions of the merits of its removal.

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