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Oregon Route 58 (OR 58), also known as the Willamette Highway No. 18 (see Oregon highways and routes), is a state highway in the U.S. state of Oregon. The route, signed east–west, runs in a southeast-northwest direction, connecting U.S. Route 97 north of Chemult with Interstate 5 south of Eugene. It links the Willamette Valley and Central Oregon, crossing the Cascade Range at Willamette Pass. OR 58 is generally a modern two-lane highway with a speed limit of 55 mph (88 km/h),〔Oregon Department of Transportation, (TransGIS ) (Generic Mapping), accessed October 2007〕 built through the Willamette National Forest in the 1930s. OR 58 is a designated freight route,〔Oregon Department of Transportation, (State Highway Freight System ), March 2006〕 forming one of several connections between I-5 and US 97, which leads back to I-5 at Weed, California. This is a popular alternate route for trucks on the I-5 corridor, avoiding the steep grades and winter closures of I-5 over Siskiyou Summit.〔California Department of Transportation, (Transportation Concept Report: United States Route 97 ), October 2003, p. 20〕 The highway is also on the National Highway System, and is classified as an expressway southeast of Odell Lake. (US 97 is also classified as such south to the state line, and in California it is part of the Freeway and Expressway System.)〔Oregon Department of Transportation, (Highway Classification Maps ), June 2006〕 This matches the general routes of the 1887 Oregon and California Railroad over Siskiyou Summit and the 1926 Natron Cutoff along OR 58 and US 97; the latter is now part of the Union Pacific Railroad's I-5 Corridor rail line, while the former is the Central Oregon and Pacific Railroad shortline. ==Route description== Oregon Route 58 begins (at its western terminus) at an interchange with Interstate 5 and Oregon Route 99 near Goshen, located between the cities of Eugene and Creswell. It heads due southeast from there, following the course of the Willamette River into the foothills of the Cascade Mountains. The highway passes several lakes, including Dexter Lake and Lookout Point Lake, and provides access to the town of Lowell. Further into the mountains, it passes through the cities of Oakridge and Westfir. It continues into the mountains, up the Salt Creek canyon, to the summit of Willamette Pass, after which it descends into central Oregon. Oregon Route 58 terminates at an interchange with U.S. Route 97. Oregon Route 58 is of high importance as a freight corridor. It is the primary route between the Willamette Valley and south-central Oregon, including the Klamath Falls region. It also is the preferred route to points further southeast, including Reno, Nevada. Finally, it is an important alternate route for traffic moving up and down the West Coast, as bad weather frequently closes Interstate 5 at the Siskiyou Summit during the winter. It should be noted that the Union Pacific Railroad I-5 Corridor main line through Oregon and California roughly follows OR 58 and US 97. While a rail line exists through Siskiyou Summit, it is difficult for trains to use even in good weather, due to an excessively steep grade, and is often uneconomical to use in winter weather. It is common for West Coast truck traffic to prefer OR 58 and US 97 to Interstate 5 for the same reason. Two scenic byways—the West Cascades Scenic Byway and the Cascade Lakes Scenic Byway—intersect with OR 58. 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「Oregon Route 58」の詳細全文を読む スポンサード リンク
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