Marquam Bridge

The Marquam Bridge /ˈmɑːrkəm/ is a double-deck, steel-truss cantilever bridge that carries Interstate 5 traffic across the Willamette River from south of downtown Portland, Oregon, on the west side to the industrial area of inner Southeast on the east. It is the busiest bridge in Oregon, carrying 140,500 vehicles a day as of 2016. The upper deck carries northbound traffic; the lower deck carries southbound traffic. The Marquam also has on and off ramps for Interstate 405 on the south end of the bridge, while the terminus on the east bank of the river is near the interchange with Interstate 84.

Marquam Bridge
View from the south (from Ross Island Bridge) in 2005, before the Tilikum Crossing was built
Coordinates45.5079°N 122.6690°W / 45.5079; -122.6690
Carries I-5
CrossesWillamette River
LocalePortland, Oregon
Maintained byODOT
ID number08328
Characteristics
DesignCantilever truss
Total length1,043 feet (318 m)
Width57 feet (17 m)
Longest span440 feet (130 m)
Clearance above<35 feet (11 m) northbound
Clearance below130 feet (40 m)
History
OpenedOctober 1966
Location
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