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The South Fork Trinity River is the main tributary of the Trinity River, in the northern part of the U.S. state of California. It is part of the Klamath River drainage basin. It flows generally northwest from its source in the Klamath Mountains, through Humboldt and Trinity Counties, to join the Trinity near Salyer. The main tributaries are Hayfork Creek and the East Branch South Fork Trinity River. The river has no major dams or diversions, and is designated Wild and Scenic for its entire length. One of the largest unimpaired river systems in California, the South Fork drains a rugged, remote watershed of . The resulting pristine habitat is important for several endangered species and rare plants. Historically, the South Fork watershed was known for its prodigious anadromous fish population and dense old-growth forests. During the mid-20th century, the river channel was heavily damaged by major flooding, which was exacerbated by erosion caused by mining, logging and ranching. Decades later the South Fork is still considered in the process of recovery. ==Course== The South Fork Trinity River begins as a small spring on the west slope of the Brooks Ridge near North Yolla Bolly Mountain, above sea level.〔 From there, it flows briefly west and turns to the north, receiving numerous small tributaries which drain a series of steep, forested valleys in the headwaters. At about from its source, the river is crossed by the Humboldt Trail, then it receives north-flowing Shell Mountain Creek from the left. Shortly downstream, the long East Branch South Fork Trinity River joins from the right.〔 Shortly afterwards, it receives Happy Camp Creek from the left and Smoky Creek from the right. Below here the river passes Forest Glen, receives Rattlesnake Creek from the right, and crosses underneath California State Route 36. Here the river runs roughly parallel to the Mad River, separated by a divide to the west. Below State Route 36, it receives Butter and Indian Valley Creeks, both from the right.〔〔〔 The river then enters the wide Hyampom Valley, where it passes the town of Hyampom and receives its biggest tributary, Hayfork Creek, from the right. It then passes the Hyampom Airport and receives Pelletreau Creek from the left. Within the valley the river briefly exhibits braided characteristics, with a wide floodplain. At the north end of the valley the river enters another canyon, receiving Mingo Creek from the left, then veers sharply eastward and then turns sharply north again. The river receives Madden Creek from the left and crosses underneath California State Route 299. Directly below the bridge, the South Fork flows north into the Trinity River.〔〔〔 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「South Fork Trinity River」の詳細全文を読む スポンサード リンク
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