In order of appearance: Columbia River Highway Home Page: Latourelle Bridge postcard: Private Donation of Columbia River Highway postcards.
West End Shepperd's Dell postcard: Private Donation of Columbia River Highway postcards.
Castle Rock postcard: Private Donation of Columbia River Highway postcards. Mitchell Point Tunnel postcard (apparently misprinted as Storm Crest Tunnel on postcard): Private Donation of Columbia River Highway postcards. Oneonta Bluff postcard: Private Donation of Columbia River Highway postcards. Wah-kee-na Falls postcard: Private Donation of Columbia River Highway postcards.
Tooth Mountain Viaduct postcard: Private Donation of Columbia River Highway postcards. Shepperd's Dell postcard: Private Donation of Columbia River Highway postcards. East approach Shepperd's Dell postcard: Private Donation of Columbia River Highway postcards.
Governor Oswald West proclamation, April 22, 1914: Secretary of State Official Documents. Multnomah County letter: Oregon Department of Transportation, Highway Division, State Highway Engineer Correspondence Clatsop County letter: Oregon Department of Transportation, Highway Division, State Highway Engineer Correspondence The Oregon Sunday Journal newspaper clipping, 10/25/14: Oregon Department of Transportation, Highway Division, State Highway Engineer Correspondence folder "Multnomah 1914."
Oregon Department of Transportation, Highway Division Photograph #822, Crown Point. Oregon Department of Transportation, Highway Division Harold Spooner drawing of Multnomah Falls Oregon State Library, Photographs of the Columbia River and Oregon by Carleton Watkins, Castle Rock. 
Introduction
| Prohibition
| McLoughlin
| Prison
| Expositions
| Copperfield
| Environment |