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〕 | mouth_elevation_imperial = 453 | mouth_elevation_note = 〔 | length_imperial = 46.3 | length_round = 0 | length_note = | watershed_imperial = 5373 | watershed_round = 1 | watershed_note = | discharge_location = mouth | discharge_imperial = 140 | discharge_round = 0 | discharge_note = 〔Benke and Cushing, p. 519〕 | discharge_max_imperial = 1845 | discharge_min_imperial = | discharge1_location = | discharge1_note = | map = | map_size = 300 | map_caption = |map_alt = | map1 =USA Arizona location map.svg | map1_size = 300 | map1_caption = Location of the mouth of the Bill Williams River in Arizona | map1_alt = | map1_locator = Arizona svg | commons = }} The Bill Williams River is a 〔(【引用サイトリンク】 title=The National Map )〕 river in west-central Arizona where it, along with its tributary, the Santa Maria River, form the boundary between Mohave County to the north and La Paz County to the south.〔''Arizona Atlas & Gazetteer,'' DeLorme, 4th ed., 2001, pp. 46-47〕 It is a major drainage westwards into the Colorado River of the Lower Colorado River Valley south of Hoover Dam and Lake Mead, and the drainage basin covers portions of northwest, and west-central Arizona. The equivalent drainage system paralleling the east–west lower reaches of the Bill Williams is the Gila River, which flows east-to-west across central Arizona, joining the Colorado River in the southwest at Yuma. The confluence of the Bill Williams River with the Colorado is north of Parker, and south of Lake Havasu City.〔 To the north of the river are the Artillery Mountains, the Rawhide Mountains and the Bill Williams Mountains. To the south lie the Buckskin Mountains.〔 The old mining camp of Swansea (now a ghost town) lies in the Buckskin Mountains about south of the river.〔''Swansea, Arizona,'' 7.5 Minute Topographic Quadrangle, USGS, 1990〕 The two tributaries that form the Bill Williams are the Big Sandy River and the Santa Maria River.〔 Alamo Lake, a flood control reservoir, lies just west of the confluence of the two tributaries.〔 The reservoir and state park is a major fishing and recreation region on the river. The confluence of the Bill Williams River with the Colorado River is just north of Parker Dam and the entire riparian environment has state parks and wilderness areas: Buckskin Mountain State Park, Cattail Cove State Park, and the Gibraltar Mountain, Swansea, and Cactus Plain wilderness areas. ==Flora and fauna== Fish species in the Bill Williams river include largemouth bass, yellow bullhead, green sunfish, bluegill, carp, mosquitofish, red shiner, razorback sucker, and others. The lowland leopard frog, North American river otter, beaver, muskrat, Arizona toad, and spiny-spotted turtle are among the major aquatic vertebrates found in or near the water. Plants in the riparian zones include several kinds of willows as well as bulrushes, and saltcedar. The Bill Williams Wildlife Refuge near Parker is frequented by at least 335 species of birds.〔Benke and Cushing, p. 535〕 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「Bill Williams River」の詳細全文を読む スポンサード リンク
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