Historic Columbia River Highway, Mosier Twin Tunnels, East of Mosier, Troutdale, Multnomah County, OR

Significance: The only set of highway tunnels with adits or windows in Oregon. One of the few examples of this type of tunnel in the United States.

Survey number: HAER OR-36-T

Building/structure dates: 1920 Initial Construction

Building/structure dates: 1921 Subsequent Work

Building/structure dates: 1938 Subsequent Work

Building/structure dates: 1953 Subsequent Work

National Register of Historic Places NRIS Number: 83004168

tunnels transportation civil engineering mosier or historic columbia highway historic columbia river highway mosier twin mosier twin tunnels troutdale multnomah multnomah county oregon c camillo john arthur elliott robert w hadlow historic american engineering record roger keiffer a d kern roy a klein jet lowe james norman oregon department of transportation lisa m pfueller photo ultra high resolution high resolution library of congress national register of historic places

1969 - 1980

Library of Congress

http://www.loc.gov/

No known restrictions on images made by the U.S. Government; images copied from other sources may be restricted. http://www.loc.gov/rr/print/res/114_habs.html