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The Ross Island Bridge is a cantilever truss bridge that spans the Willamette River in Portland, Oregon. It carries U.S. Route 26 (Mount Hood Highway) across the river between southwest and southeast Portland. The bridge opened in 1926 and was designed by Gustav Lindenthal and honors Oregon pioneer Sherry Ross. It is named for its proximity to Ross Island. Although it looks like a deck arch bridge, it is a cantilever deck truss bridge, a rare type in Oregon. ==History and description== The bridge was part of the unprecedented period of bridge building in Portland during the 1920s. It was opened on December 21, 1926, and cost $1.9 million to construct. The bridge was designed by famed engineer Gustav Lindenthal.〔 The bridge is named for its location close to Ross Island, an island in the Willamette River which measures about one-and-a-half by one miles. The bridge is about 800 feet (250 m) north of the island and does not connect with, nor does it provide access to, Ross Island. There is a pedestrian walkway on the north side of the bridge, with no barrier between the sidewalk and the westbound right lane. The bridge's girders were originally painted black, but in 1955–56 they were repainted green.〔Editorial (January 16, 1957). "Rainbows cost money". ''The Oregonian'', p. 14.〕 In 1961, Portland architect Lewis Crutcher suggested repainting all of Portland's downtown-area bridges from black into different colors,〔Editorial (October 12, 1961). "'Singing' Bridges". ''The Oregonian'', p. 24.〕 and the proposal also included changing the Ross Island Bridge's color to blue.〔Editorial (May 28, 1962). "Orange-Red Bridge". ''The Oregonian'', p. 16.〕 The proposal was approved by the Multnomah County Commission, and repainting of the Ross Island Bridge was carried out in the summer of 1965. The bridge's color remains blue today, specifically "phthalo blue".〔 During the Great Depression, the bank of the Willamette near the Ross Island Bridge became the site of a Hooverville. In 1976, ownership was transferred from Multnomah County to the Oregon Department of Transportation.〔 In 2000–2001 the bridge underwent a $12.5 million renovation in which the deck was replaced, the railings were replaced and upgraded, and the drainage system and lighting were improved. During this renovation, lead paint was discovered, causing some delays and cost overruns. 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「Ross Island Bridge」の詳細全文を読む スポンサード リンク
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