Marquam Bridge
| Marquam Bridge | |
|---|---|
View from the south (from Ross Island Bridge) in 2005, before the Tilikum Crossing was built
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| Coordinates | 45°30′28″N 122°40′08″W / 45.5079°N 122.6690°WCoordinates: 45°30′28″N 122°40′08″W / 45.5079°N 122.6690°W |
| Carries |
 I-5
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| Crosses | Willamette River |
| Locale | Portland, Oregon |
| Maintained by | ODOT |
| ID number | 08328 |
| Characteristics | |
| Design | Cantilever truss |
| Total length | 1043 feet (318.2 m) |
| Width | 57 feet |
| Longest span | 440 feet (134.1 m) |
| Clearance above | <35 feet northbound |
| Clearance below | 130 feet |
| History | |
| Opened | October 1966 |
The Marquam Bridge /ˈmɑːrkəm/ is a double-deck, steel-truss cantilever bridge that carries Interstate 5 traffic across the Willamette River south of downtown Portland, Oregon. It is the busiest bridge in Oregon, carrying 135,900 vehicles a day as of 2008. The upper deck carries northbound traffic; the lower deck carries southbound traffic.
The bridge was designed and built by the Oregon Department of Transportation at a cost of $14 million. The lower southbound deck was opened on October 4, 1966, and the upper northbound deck on October 18, 1966. The main span of the bridge is 440 ft (130 m) long and the two side spans are 301 ft (92 m) each. The vertical clearance of the lower deck is 130 feet (40 m) and the upper deck is 20 feet (6.1 m) above the lower. The bridge is named after Philip Marquam, a state legislator and Multnomah County judge, who owned much of Marquam Hill where Oregon Health & Science University and the Veterans Affairs Medical Center now stand. At the eastern end of the bridge, on the lower deck, is a ramp stub which was intended to connect to the cancelled Mount Hood Freeway. As it has great importance, the Marquam was the first Portland bridge to undergo a seismic retrofit in 1995.
It was built with economy in mind and the public reacted unfavorably to the structure's aesthetics, including a formal protest from the Portland Arts Commission. (In particular, it blocked the view of downtown from the Union Avenue Viaduct.) This led to public input in the design of the Fremont Bridge. During Mayor Vera Katz's State of the City address in 2001, she said, "It’s like having the Berlin Wall dividing east and west, with all the subtle charm of the Daytona 500 smack dab in the middle of our city."
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