SP&S work train with bridge traveller on the bridge at Shaw Island (now Hayden Island), April 16, 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.

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.

Small boat at the site of the erecting of the SP&S Columbia River Bridge, February 22, 1908. 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.

Erecting the 371 foot long span on the SP&S Columbia River Bridge, December 6, 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 1, 1907. This is a postcard image.

A view of the washout of the SP&S mainline at North Portland during the Vanport flood, May 30, 1948. Photo by N. S. Westergard.

Repair of the damaged SP&S tracks at North Portland, Oregon due to breach of the railroad fill, June 4, 1948.

Repair of the damaged SP&S tracks at North Portland, Oregon due to breach of the railroad fill, June 4, 1948.

Repair of the damaged SP&S tracks at North Portland, Oregon due to breach of the railroad fill, June 4, 1948.

Construction workers who moved the bridge erection traveler for the SP&S Coulmbia River Bridge across Shaw Island (now Hayden Island), April 16, 1908. This is a postcard image.

SP&S Columbia River Bridge piers; pier installation at Oregon Slough, November 7, 1907. This is a postcard image.

A view of SP&S Columbia River Bridge piers, Shaw Island (now Hayden Island), March 21, 1908. This is a postcard image.

SP&S Columbia River Bridge piers; view of bridge piers from Oregon Slough , April 21, 1907. This is a postcard image.

SP&S Columbia River Bridge pier; the last stone pier for the Vancouver bridge, March 7, 1908. This is a postcard image.

SP&S Columbia River Bridge girders being placed at Shaw Island (now Hayden Island), March 21, 1908. This is a postcard image.

SP&S Columbia River Bridge girders, Shaw island (now Hayden Island), April 1, 1908. 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.

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

Spokane, Portland and Seattle Railway Engineering Drawing: Wingwalls Piers, Bridge 8.8 - Oregon Slough, north of North Portland Junction, Oregon, Line Segment 047, Milepost 8.62. Sheet RR - 679, undated.