Historic Columbia River Highway, Mitchell Point Tunnel & Viaduct, Through Lower Mitchell Point on Historic Columbia , Troutdale, Multnomah County, OR
Through Lower Mitchell Point on Historic Columbia, Troutdale vicinity, OR
Find maps of Troutdale, OR
Documentation compiled after 1968.
Survey number HAER OR-36-R
Building/structure dates: 1915 initial construction
Building/structure dates: 1920 subsequent work
Building/structure dates: 1930 subsequent work
Building/structure dates: 1953 subsequent work
Building/structure dates: 1963 demolished
National Register Number: 83004168
Part of building/structure is in Hood River vicinity, Hood River County, OR.
Significance: One of four tunnels constructed on the Historic Columbia River Highway, and one of the earliest examples of highway tunnels in the United States constructed with adits used by motorists for viewing a scenic landscape.
Reinforced Concrete Construction
Elliott, John Arthur
Lancaster, Samuel C.
Charles Nelson & Company
Oregon State Highway Department
Hadlow, Robert W., Historian
Historic American Engineering Record (Library of Congress)
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