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〕 | mouth_elevation_imperial = 984 | mouth_elevation_note = 〔 | length_imperial =80 | length_round = 0 | length_note = 〔 | watershed_imperial = | watershed_round = 0 | watershed_note = | discharge_location = | discharge_imperial = | discharge_round = 1 | discharge_note = | discharge_max_imperial = | discharge_min_imperial = | discharge1_location = | discharge1_note = | map = | map_size = 300 | map_caption = |map_alt = | map1 = Alaska Locator Map.PNG | map1_size = 300 | map1_caption = Location of the mouth of the Delta River in Alaska | map1_locator = Alaska |map1_alt = | commons = }} The Delta River is an tributary of the Tanana River in the U.S. state of Alaska.〔 Its name in the Ahtna language is ''Saas Na’ ''. Fed by the Tangle Lakes of the Alaska Range, the river flows north to meet the larger river near Big Delta. In 1980, of waterways in the Delta River basin, including all of the Tangle Lakes and the main stem to within of Black Rapids became part of the National Wild and Scenic Rivers System. Of this, are designated "wild", "scenic", and "recreational".〔(【引用サイトリンク】url=http://www.rivers.gov/rivers/delta.php )〕 ==Boating== Easily accessible from the boat launch at the Tangle Lakes campground near the Denali Highway and at many points downstream along the Richardson Highway, the river can be floated in sections that vary in difficulty from Class I (easy) to Class V (extremely difficult) on the International Scale of River Difficulty and may require portages. The upstream stretches include four lakes and their Class II (medium) connecting channels. About downstream of the last lake, the river enters a canyon and flows over unrunnable waterfalls. A portage leads to a stretch of Class III (difficult) rapids. Below the Class III rapids, the river continues through of Class I and II water before entering a stretch between Ann Creek and One Mile Creek known as ''Black Rapids''. Here the difficulty is Class III rising to Class IV {very difficult) or V, followed by of Class III and then of Class I.〔 Author Karen Jettmar warns of dangers including "sweepers, canoe fragments wrapped around rocks, bears, cold and wet weather, and high winds". She says that "only experts should attempt to run Black Rapids (Class IV–V) below Mile 229 on Richardson Highway."〔 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「Delta River」の詳細全文を読む スポンサード リンク
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