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Sellwood Bridge
The Sellwood Bridge is a truss bridge that spans the Willamette River in Portland, Oregon, in the United States. It was Portland's first fixed-span bridge and, being the only river crossing for miles in each direction, is the busiest two-lane bridge in Oregon. It links the Sellwood and Westmoreland neighborhoods of Portland on the east side with Oregon Route 43/Macadam Avenue on the west side. At its east end it leads to Tacoma Street. The bridge is owned and operated by Multnomah County. The bridge's condition has been deteriorating for some years, and in the mid-2000s this led to a decision to replace it. A multi-year project to construct a replacement bridge has been under way since December 2011,〔 and the new bridge is projected to open in spring 2016.
==Original bridge==
Designed by Gustav Lindenthal, the bridge opened on December 15, 1925 at a final cost of $541,000 (equivalent to $6.9 million in 2011). It is long with of vertical waterway clearance. It has four continuous spans, all of Warren type.〔 The two center spans are long, and the two outside spans are each. The girders from the old Burnside Bridge (built in 1894) were reused at each end. The two-lane roadway is wide. There is a sidewalk on the downstream side only, with a width of ; however, the street light foundations share space with the sidewalk, making the sidewalk's usable width at those points about 3 feet (36 inches, 91 cm).〔(【引用サイトリンク】 Sellwood Bridge )〕 Allowing for safety clearances, there is less than 2 feet (24 inches, 61 cm) of usable sidewalk. The Bicycle Transportation Alliance listed the Sellwood Bridge as one of the top ten priorities for improving Portland's bicycling.
The bridge's condition has been deteriorating since the 1960s, and it is now set to be replaced by a new bridge, construction of which is targeted to begin in 2012; however as of mid-2011, $25 million was still needed.〔(【引用サイトリンク】publisher=Multnomah County )〕 In an October 2011 study, the Department of Transportation wrote that the Sellwood Bridge must be replaced 'immediately'.〔http://www.kptv.com/story/15736104/survey-deems-80-portland-bridges-structurally-deficient〕 On December 15, 2011, the county received US federal funding sufficient to begin immediate work on a replacement. On July 19, 2012, Multnomah County commissioners approved a $299 million design for a new bridge.
On January 19, 2013, the bridge was moved onto temporary steel supports by contractor Omega Morgan. Traffic will use the bridge as a detour until the replacement bridge is completed and the old concrete piers will be demolished.〔
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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