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〕 | mouth_elevation_imperial = 1860 | mouth_elevation_note = 〔 | length_imperial = 560 | length_round = 0 | length_note = 〔 | watershed_imperial = 8310 | watershed_round = 0 | watershed_note = 〔(【引用サイトリンク】url=http://waterdata.usgs.gov/nwis/nwisman/?site_no=06337000&agency_cd=USGS ) This is only a close approximation of the entire basin. It does not include a small fraction of the basin below the river gauge, located about 25 mi (40 km) upstream of the river mouth.〕 | discharge_location = south of Watford City, about from the mouth | discharge_imperial = 534 | discharge_round = 0 | discharge_note = 〔(【引用サイトリンク】url=http://waterdata.usgs.gov/nwis/nwisman/?site_no=06337000&agency_cd=USGS ) This is the average discharge for the years 1990–2010, derived by adding the discharge for each of these years and dividing by 21.〕 | discharge_max_imperial = 110000 | discharge_min_imperial = 0 | discharge1_location = | discharge1_note = | map = Littlemissouririvermap.png | map_size = | map_caption = Little Missouri watershed | map1 = North Dakota Locator Map.PNG | map1_size = | map1_caption = Location of the mouth of the Little Missouri River in North Dakota |map_alt = | map1_locator = North Dakota | commons = }} The Little Missouri River is a tributary of the Missouri River, 560 mi (901 km) long, in the northern Great Plains of the United States. Rising in northeastern Wyoming, in western Crook County about west of Devil's Tower, it flows northeastward, across a corner of southeastern Montana, and into South Dakota. In South Dakota, it flows northward through the Badlands into North Dakota, crossing the Little Missouri National Grassland and both units of Theodore Roosevelt National Park. In the north unit of the park, it turns eastward and flows into the Missouri in Dunn County at Lake Sakakawea, where it forms an arm of the reservoir long called Little Missouri Bay and joins the main channel of the Missouri about northeast of Killdeer. The highly seasonal runoff from badlands and other treeless landscapes along the Little Missouri carries heavy loads of eroded sediment downstream. The sedimentary layers, which extend from the headwaters in Wyoming all the way to the mouth in North Dakota, vary in age, but most of the beds along the river belong to the Bullion Creek and Sentinel Butte formations, both deposited during the Paleocene (about 66 to 56 million years ago).〔 The deposits include siltstone, claystone, sandstone, and lignite coal laid down in a coastal plain during the Laramide orogeny. ==See also== *List of North Dakota rivers *List of longest rivers of the United States (by main stem) *List of rivers of Montana *List of South Dakota rivers *List of Wyoming rivers *Montana Stream Access Law 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「Little Missouri River (North Dakota)」の詳細全文を読む スポンサード リンク
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