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Burnside Bridge : ウィキペディア英語版
Burnside Bridge

The Burnside Bridge is a 1926-built bascule bridge that spans the Willamette River in Portland, Oregon, United States, carrying Burnside Street. It was added to the National Register of Historic Places in November 2012.
==Design==
The bridge was designed by Ira G. Hedrick〔(Ira Grant Hedrick, Designer of Bridges; Built the Burnside Lift Span at Portland, Ore.-Firm Did Work in Mexico-Dies at 69 ). ''The New York Times''.〕 and Robert E. Kremers, incorporating a bascule lift mechanism designed by Joseph Strauss.
Including approaches, the Burnside has a total length of and a center span. While lowered this span is normally above the river. The deck is made of concrete, which contributes to its being one of the heaviest bascule bridges in the United States.〔 The counterweights, housed inside the two piers, weigh . The lifting is normally controlled by the Hawthorne Bridge operator, but an operator staffs the west tower during high river levels.
The bridge provides shelter for the initially unauthorized Burnside Skatepark under the east end.〔(【引用サイトリンク】Dreamland Skateparks ">title=Portland's Burnside Skatepark )〕 On weekends, the Portland Saturday Market was held mostly under the bridge's west end for many years. The market was reoriented in 2009, but the Burnside Bridge continues to provide shelter for a few vendor stalls at the market's northern end.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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