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The proposed route was to run parallel to the existing alignment of US 26 on Powell Boulevard, and would have required the destruction of 1,750 long-standing Portland homes and one percent of the Portland housing stock. Plans for the freeway triggered a revolt in Portland in the late 1960s and early 1970s, leading to its eventual cancellation. In addition, plans for other proposed freeways in Portland were also scrapped, including Interstate 505. Funds for the project (and other canceled freeways) were spent on other transportation projects, including the first section of the MAX Light Rail system.
When the freeway was canceled, a segment was already completed southeastwards from East Burnside Road and Southeast Powell Blvd in Gresham, continuing to Sandy, Oregon which remains in use today.
Nothing shaped Portland so much as the murder of the Mount Hood Freeway.
http://www.wweek.com/portland/article-4212-highway_to_hell.html
http://www.oregonencyclopedia.org/articles/mt__hood_freeway/#.VXCE9c9VhBc
E5 Ghost Ramps of Portland
https://pdxccentric.wordpress.com/e5-ghost-ramps-of-portland
Abbott, Carl. Portland: Planning, Politics, and Growth in a Twentieth-Century City. Lincoln: University of Nebraska Press, 1983.
Oregon State Highway Department. Freeway and Express System, Portland Metropolitan Area, 1955. Salem: Oregon State Highway Department, 1955.
Portland Planning Commission. Mt. Hood Freeway: Report to the Portland City Council. Portland: Planning Commission, 1965.