Construction workers on the SP&S Columbia River Bridge, circa. 1908. This is a postcard image.

A view of open draw span on the SP&S Columbia River Bridge at Vancouver, Washington, December 1, 1907. This is a postcard image.

A view of the concrete mixing plant used during construction of the SP&S Columbia River Bridge, February 22, 1908. This is a postcard image.

A view of the concrete mixing plant used during construction of the SP&S Columbia River Bridge, February 22, 1908. This is a postcard image.

Color postcard view of the SP&S Columbia River Bridge from the Vancouver end with southbound passenger train on the bridge, January 15, 1914. This is a postcard image.

Color postcard view of the SP&S Columbia River Bridge, postmarked January 2, 1913. This is a postcard image.

Construction workers on the SP&S Columbia River Bridge, January 31, 1908. This is a postcard image.

First locomotive on the SP&S Columbia River Bridge, January 9, 1908.

A view of the north end of the SP&S Columbia River Bridge, postmarked July 13, 1912. This is a postcard image.

Color postcard panorama view of the SP&S Columbia River Bridge, May 18, 1909. This is a folding postcard image.