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The Glenn L. Jackson Memorial Bridge, or I-205 bridge, is a segmental bridge that spans the Columbia River between Vancouver, Washington and Portland, Oregon. Planning for the structure began in earnest in 1964 when it was designated as part of the East Portland Freeway (later renamed Veteran's Memorial Freeway), Interstate 205. Construction began in August 1977. In order to avoid disrupting river traffic, the bridge was built one segment at a time. The segments, weighing upwards of 200 tons, were cast downstream and barged into place. The bridge was opened on December 15, 1982.〔Callister, Scotta (December 16, 1982). "Rain fails to faze bridge-crossers". ''The Oregonian'', p. E12.〕 The finished project cost was $169.6 million: $155.7 million from Federal funds, $4 million from Washington state funds and $9.9 million from Oregon state funds.〔Federal-aid Project No. I-205-7(85)315 Contract 8526; Federal-aid Project No. I-205-7(65)314 Contract 8862; Federal-aid Project No. I-205-7(66)315 Contract 8905; Federal-aid Project No. I-205-7(85)314 Contract 9510; Federal-aid Project No. I-205-7(84)314 Contract 9444; Federal-aid Project No. I-205-1(121)0 Washington Approach Contract〕 Three men died during its construction. It is a twin structure with four lanes in each direction and a wide bicycle and pedestrian path in between. The bridge is long from the Washington side of the river to Government Island and another in length from Government Island to the Oregon side of the river. The main span, near the Washington side, is long with of vertical clearance at low river levels. The bridge was named for Glenn Jackson, the chairman of the Oregon State Highway Commission and later the Oregon Economic Development Commission. The average daily traffic during 2013 was 142,000 vehicles. ==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「Glenn L. Jackson Memorial Bridge」の詳細全文を読む スポンサード リンク
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