United States West
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The Bridges of Portland, Oregon - Photos and descriptions of Portland, Oregon's wide variety of river bridges.
Knik Arm Bridge and Toll Authority - Created to construct a bridge connecting Anchorage and the Mat-Su Borough. Page includes history, diagrams, and maps.
Oregon's Covered Bridges - History and county by county guide, with photographs and descriptions. Also an explanation of truss types, with diagrams.
3rd Street Tunnel of Los Angeles - Postcards and photos from its construction in the 1890s to the present day.
Whittier Tunnel - A one lane shared railroad/road tunnel under construction. Help build the largest human-edited directory on the web.