![]() ![]() portion of the Alaska Highway that retain integrity from the World War II period of significance. This bridge is one of three truss bridges in the U.S. The Alaska Highway was built as a land transport route in the event that the Japanese seized shipping lines in the Pacific and to connect and supply a chain of strategic military airfields in all weather conditions. The Johnson River Bridge is associated with the construction of the Alaska Highway from 1942-1944 by the U.S. The Robertson River Bridge is associated with the construction of the Alaska Highway from 1942-1944 by the U.S. One of the few tied-arch bridges in the U.S., this type was chosen for the Mobile Delta Crossing for its ability to span a great distance and for the design's cost effectiveness. The main span is a distinctive tied-arch bridge made of weathering steel that spans 800 feet. The Mobile Delta Crossing is 32,098 feet in length and covers slightly over 6 miles of bridge structure. The bridge crosses the Mobile-Tensaw Delta, which was recently named a National Natural Landmark by Congress. The Mobile Delta Crossing was designed by Howard Needles Tammen and Bergendoff and was constructed in 1980. Interstate NumberÄate Listed on National Register OR Determined Eligible << Return to Historic Preservation's Interstate Highway System page Final List of Nationally and Exceptionally Significant Features of the Federal Interstate Highway Systemįor best printing results, please print this webpage in landscape format.
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