Marquam Bridge, Double-deck cantilever bridge in Portland, United States.
The Marquam Bridge features two levels of steel trusses spanning 1,043 feet across the Willamette River, connecting Interstate 5 between downtown Portland and Southeast districts.
Built in 1966 at a cost of 14 million dollars, the Marquam Bridge became the first Portland bridge created exclusively for motor vehicle traffic on the Interstate Highway System.
The bridge received its name from Philip Marquam, who owned large sections of Marquam Hill where Oregon Health & Science University currently stands.
The structure carries 140,500 vehicles daily on separate decks, with northbound traffic using the upper level while southbound vehicles travel on the lower section.
The bridge includes an incomplete ramp on the eastern end that was intended to connect with the Mount Hood Freeway project, which never materialized.
Location: Oregon
Inception: October 1966
Official opening: October 1966
GPS coordinates: 45.50810,-122.67000
Latest update: May 20, 2025 23:25
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