Early view of SP&S Tunnel Number 5 near Cooks, Washington (Milepost 69), undated. Photo by Angelus Commercial Studio.

Early view of SP&S Tunnel Number 5 near Cooks, Washington (Milepost 69), undated. Photo by Angelus Commercial Studio.

SP&S turntable and roundhouse; aerial view of turntable, Hoyt Street Roundhouse at Portland, undated.

Erecting the 371 foot long span on the SP&S Columbia River Bridge, December 1, 1907. This is a postcard image.

Driving the last pin on the 371 foot long span on the SP&S Columbia River Bridge, December 15, 1907. This is a postcard image.

Erecting the 371 foot long span on the SP&S Columbia River Bridge, December 6, 1907. This is a postcard image.

Driving the 'U' pin on SP&S Columbia River Bridge at spans eight and nine, February 20, 1908. This is a postcard image.

Small boat at the site of the erecting of the SP&S Columbia River Bridge, February 22, 1908. This is a postcard image.

Last pin driven on the erection of span four-five on the SP&S Columbia River Bridge, January 3, 1908. This is a postcard image.

Erecting the 371 foot long span on the SP&S Columbia River Bridge, November 25, 1907. This is a postcard image.