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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 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]
Interstate Bridge (Portland–Vancouver Highway Bridge) 1917* (and second, parallel bridge in 1958) Truss with lift span: 3,538 feet (1,078 m) Columbia River: Interstate 5: Glenn L. Jackson Memorial Bridge: 1982: Segmental: 11,750 feet (3,580 m) Columbia River: Interstate 205
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]
A revived project, the Interstate Bridge Replacement Program, was launched in 2017. [31] The Joint Oregon-Washington Legislative Action Committee was formed by the Washington legislature in 2017 to study a bridge replacement, but initially had no Oregon representation for a year.
The project to replace the Interstate Bridge over the Columbia River on Interstate 5 connecting Washington and Oregon is estimated to cost $6 billion.