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The Satsop River is a stream in the U.S. state of Washington. It has three main tributary forks, the East Fork, West Fork, and Middle Fork Satsop Rivers. The main stem Satsop River is formed by the confluence of the West and East Forks. The Middle Fork is a tributary of the East Fork. The three forks are much longer than the main stem Satsop itself, which flows south from the confluence only a few miles to join the Chehalis River near Satsop, Washington. Other significant tributaries include the Canyon River and Little River, both tributaries of the West Fork Satsop, and Decker Creek, a tributary of the East Fork Satsop River. The Satsop River's major tributaries originate in the Olympic Mountains and its southern foothills, the Satsop Hills, within Grays Harbor and Mason counties. Most of the Satsop River's watershed consists of heavily wooded hill lands. The upper tributaries extend into Olympic National Forest, approaching but not quite reaching Olympic National Park. The Satsop River watershed is located east of the Wynoochee River and south of the Skokomish River watersheds. ==Course== The main stem Satsop River originates at the confluence of the East and West Forks and flows generally south to Satsop, where it empties into Chehalis River at Chehalis river mile 20.2. U.S. Route 12 crosses the river near its mouth. The main stem river flows through a broad valley used for farming.〔(【引用サイトリンク】publisher= Chehalis River Council )〕〔General course info from USGS topographic maps accessed via the "GNIS in Google Map" feature of the USGS Geographic Names Information System website.〕 The river has several significant tributaries, including the West, East, and Middle Forks. These forks are significant rivers in their own right and unite only a few miles north of the Chehalis River. The forks are all much longer than the main stem Satsop River. The West Fork Satsop River rises in the southern Olympic Mountains. It flows south through a narrow gorge. In its final miles the river valley broadens. At long, the West Fork is the longest tributary. The total river length from the West Fork's source to the mouth of the main stem Satsop River is approximately . The length from the source of the Canyon River is nearly as long, at .〔Calculated in Google Earth〕 Its watershed is large. Much of the watershed is privately owned timber lands.〔 The West Fork has two major tributaries, the long Canyon River and the long Little River.〔 The Canyon River, West Fork, and Middle Fork all originate close to one another in the Olympic Mountains. The Canyon River's source is approximately east of the source of the West Fork and west of the source of the Middle Fork. These rivers originate in the southern Olympic Mountains in the general vicinity of Chapel Peak, Dusk Point, and Anderson Butte. The East Fork Satsop River originates at the confluence of Phillips Creek and Stillwater Creek. It flows generally southwest through a broad and flat valley. Bingham Creek is its main tributary, joining from the north.〔 Below Bingham Creek the East Fork flows through Carstairs Prairie before being joined by Decker Creek and the Middle Fork Satsop River, both from the north. The East Fork is approximately long. Its headwater tributary, Stillwater Creek, is long.〔 The Middle Fork Satsop River rises in the foothills of the Olympic Mountains and flows south, passing through steep gorges and canyons. At long it is the second longest tributary.〔 Shortly below the Middle Fork's confluence with Baker Creek its valley widens as the river approaches its confluence with the East Fork Satsop River. Most of the watershed of the Middle Fork is second-growth forest used for timber production.〔 Decker Creek flows through broad prairie lands and gently sloping valleys. It joins the East Fork Satsop River upstream from the Middle Fork confluence.〔 Decker Creek is approximately long.〔 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「Satsop River」の詳細全文を読む スポンサード リンク
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