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Astoria–Megler Bridge
The Astoria–Megler Bridge is a steel cantilever through truss bridge that spans the Columbia River between Astoria, Oregon and Point Ellice near Megler, Washington, in the United States. Located from the mouth of the river, the bridge is long〔(【引用サイトリンク】 Lewis & Clark's Columbia River - 200 Years Later: Astoria-Megler Bridge )〕 and was the last completed segment of U.S. Route 101 between Olympia, Washington, and Los Angeles, California. It is the longest continuous truss bridge in North America.
==History==
Ferry service between Astoria and the Washington side of the Columbia River began in 1926.〔(Astoria-Megler Bridge. ) Astoria & Warrenton Area Chamber of Commerce. Retrieved on May 14, 2008.〕 The Oregon Department of Transportation purchased the ferry service in 1946. This ferry service did not operate during inclement weather and the half-hour travel time caused delays. In order to allow faster and more reliable crossings near the mouth of the river, a bridge was planned. The bridge was built jointly by the Oregon Department of Transportation and Washington State Department of Transportation.
Construction on the structure began on November 5, 1962. The concrete piers were cast at Tongue Point, 4 miles (6 km) upriver. The steel structure was built in segments at Vancouver, Washington, 90 miles (145 km) upriver, then barged downstream where hydraulic jacks lifted them into place. On August 27, 1966, with more than 30,000 people in attendance, Governors Mark Hatfield of Oregon and Dan Evans of Washington opened the bridge by cutting a ceremonial ribbon. The cost of the project was $24 million, equivalent to $ today, and was paid for by tolls that were removed on December 24, 1993, more than two years early.〔
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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