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The Oliver Bridge was constructed across the Saint Louis River in 1916 by the Interstate Transfer Railway Company, a Wisconsin corporation, under special federal authorization from the 60th United States Congress (Session I, Chapter 31, February 20, 1908). It connects the Gary – New Duluth neighborhood, part of the city of Duluth, Minnesota with the village of Oliver, Wisconsin across the Saint Louis River. The bridge is long and is principally of steel truss construction. The upper deck carries the single track rail line (formerly a double line, but the 2nd line has since been removed) while a lower deck carries the road connecting Wisconsin Highway 105 to Minnesota State Highway 39. The upper deck was built so as to allow a streetcar line to be constructed from Gary–New Duluth to south Superior connecting the Duluth and Superior Streetcar systems. The line was never built and the systems were connected across the Twin Ports Harbor. On the Oliver side, a section of the bridge was built to swing allowing passage of large vessels despite the river only being navigable for a few miles upstream of the bridge. Only one vessel is ever thought to have used this facility, a ferry excursion boat operating between the Duluth harbor and the Fond du Lac neighborhood of Duluth. The ferry service ceased in the 1930s and the swing section has not operated since. The road deck was originally a wooden deck. Modernization came in 2000 when both states' DOTs (WisDOT and Mn/DOT) cooperated with the Duluth, Missabe and Iron Range Railway to jointly fund a reconstruction of the roadway surface, which now features a stronger steel and reinforced concrete deck. A weight restriction, which was lowered to one ton as the road deck deteriorated, was then lifted. A pedestrian walkway also existed atop the railway deck, but fell into disrepair and is no longer usable. The Oliver Bridge is currently owned by the Canadian National Railway. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oliver Bridge」の詳細全文を読む スポンサード リンク
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