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〕 | source_elevation = | source_elevation_imperial = 4540 | source_elevation_note =〔Google Earth elevation for GNIS source coordinates. Retrieved on March 12, 2007.〕 | mouth_name = Monongahela River | mouth_location = Fairmont, WV | mouth_location_note = | mouth_elevation = | mouth_elevation_imperial = 863 | mouth_elevation_note =〔 | mouth_lat_d = 39 | mouth_lat_m = 27 | mouth_lat_s = 54 | mouth_lat_NS = N | mouth_long_d = 80 | mouth_long_m = 09 | mouth_long_s = 11 | mouth_long_EW = W | mouth_coordinates_note =〔 | tributary_left = Middle Fork River | tributary_left1 = Buckhannon River | tributary_right = | tributary_right1 = | map = Monon TygartValleyRiver.png | map_size = 290 | map_caption = Map of the Monongahela River basin, with the Tygart Valley River highlighted | map_first = }} The Tygart Valley River — also known as the Tygart River — is a principal tributary of the Monongahela River, approximately long,〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed August 15, 2011〕 in east-central West Virginia in the United States. Via the Monongahela and Ohio rivers, it is part of the watershed of the Mississippi River, draining an area of in the Allegheny Mountains and the unglaciated portion of the Allegheny Plateau. ==Course== The Tygart Valley River rises in the Allegheny Mountains in Pocahontas County and flows generally north-northwestwardly through Randolph, Barbour, Taylor and Marion counties, past the towns of Huttonsville, Mill Creek, Beverly, Elkins, Junior, Belington, Philippi, Arden, and Grafton, to Fairmont, where it joins the West Fork River to form the Monongahela River. Downstream of Elkins, the Tygart Valley River passes through a gap between Rich Mountain and Laurel Mountain, which are considered to be part of the westernmost ridge of the Allegheny Mountains and the boundary between the Alleghenies and the Allegheny Plateau.〔 Along its course the river collects Leading Creek at Elkins; the Middle Fork River and the Buckhannon River (its largest tributary)〔 in Barbour County; and Sandy Creek and Three Fork Creek in Taylor County.〔 Just upstream of Grafton, the river was impounded by a U.S. Army Corps of Engineers dam in 1938 to form Tygart Lake. Valley Falls State Park is along the river between Grafton and Fairmont.〔〔(【引用サイトリンク】title= Valley Falls State Park )〕 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「Tygart Valley River」の詳細全文を読む スポンサード リンク
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