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The Marquam Bridge / ˈ m ɑːr k əm / is a double-deck, steel-truss cantilever bridge [1] 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. [2]
The Oregon state government initially proposed numbering the auxiliary Interstates using lettered suffixes, but were denied in 1958 by the American Association of State Highway Officials (forerunner to the AASHTO). [7] The last section of the Interstate Highway system to be built in Oregon, on I-82 near Hermiston, opened on September 20, 1988. [8]
The Sherars Bridge Highway can be traced to a bridge over the Deschutes River, built in 1860 and rebuilt in 1862. Joseph Sherar and his wife, Jane, bought the log bridge in 1871, replaced it with a wooden toll bridge , and improved 60 miles (97 km) of an existing wagon road that crossed the bridge. [ 1 ]
Oregon Governor John Kitzhaber introduced a bill for the 2013 legislature (H.B. 2260) which gives the state authority to raise money for the project via tolling; in the bill the project is referred to as "The Interstate 5 Bridge Replacement Program" rather than the CRC, a rebranding noted by local and national journalists. [14] [15] [16]
The main span, near the Washington side, is 600 ft (183 m) long with 144 ft (44 m) of vertical clearance at low river levels. The bridge was named for Glenn Jackson, the chairman of the Oregon State Highway Commission and later the Oregon Economic Development Commission. [8] The average weekday traffic during 2019 was 166,152 vehicles. [2]
The bridge — so old that horses were still a main mode of transportation when it opened — now carries more than 130,000 vehicles a day over the Columbia River between Portland and Vancouver, Wash
The Interstate Bridge's name is a simple descriptive one based on its location, as a bridge connecting two states. [2] In 1917, the new bridge gave its name to a Portland arterial street. Shortly before the bridge opened, a pair of streets through North Portland that were planned to be treated as the main route to and from the bridge, Maryland ...
The project to replace the Interstate Bridge over the Columbia River on Interstate 5 connecting Washington and Oregon is estimated to cost $6 billion.