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The Green River is a long river in the state of Washington in the United States, arising on the western slopes of the Cascade Mountains south of I-90. The upper Green River valley forms the western approach to Stampede Pass, and was once home to many small railroad and logging towns such as Weston, Lester, Green River Hot Springs, Nagrom, Maywood, Humphreys, Eagle Gorge, Lemolo, and Kanaskat. Shortly before World War I, the City of Tacoma, Washington, filed for water rights on the Green River. Today, much of the upper valley has become a gated water supply watershed for Tacoma and access is heavily restricted, creating controversy among recreation enthusiasts. Between 1880 and 1888, the Northern Pacific Railway explored and surveyed the Green River. The railway constructed the first direct rail link across Washington's Cascade Range with the opening of their Stampede Tunnel in 1888. ==History== Until 1906, the Green River flowed into the White in downtown Auburn. In 1906, however, the White River changed course above Auburn following a major flood and emptied into the Puyallup River as it does today. The lower portion of the historic White River—from historic confluence of the White and Green Rivers to the historic confluence with the Black River at Tukwila that forms the Duwamish—is now considered part of the Green River. Then, with the opening of the Lake Washington Ship Canal in 1916, the lake's level dropped nearly nine feet and the Black River dried up. From that time forward, the point of the name change from Green to Duwamish is no longer a confluence of rivers, though it has not changed location. Thus, the Green River now becomes the Duwamish River, flowing into the industrialized estuary known as the Duwamish Waterway and thence Elliott Bay in Seattle. By contrast, the White turns south at Auburn, and flows into the Puyallup River and later Commencement Bay in Tacoma.〔"The Green-Duwamish: A River System Re-Plumbed", ''The Green-Duwamish River: Connecting people with a diverse environment''. Duwamish River Cleanup Coalition/TAG. No date, appears to be 2008 or 2009.〕 In October 2009, giant sandbags were placed along the levee from Fort Dent through Kent and the Green River Trail was closed to cyclists. The sandbags mitigated the flood potential due to a weakness discovered in the Howard A. Hanson Dam following a January 2009 storm. Repairs strengthening the partially earthen dam by the Army Corps of Engineers have reduced this flood threat significantly. In September 2012, the Green River Trail was reopened following the removal of all giant sandbags. 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「Green River (Duwamish River)」の詳細全文を読む スポンサード リンク
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