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Lock and Dam No. 9 : ウィキペディア英語版 | Lock and Dam No. 9
Lock and Dam No. 9 is a lock and dam located near Lynxville, Wisconsin and Harpers Ferry, Iowa on the Upper Mississippi River around river mile 647.9. The lower portion of Pool 9 was formally named Lake Winneshiek. The normal pool elevation behind the dam is . It was constructed and placed in operation in July 1937. The site underwent a major rehabilitation from 1989 and 2006. The dam consists of concrete structure long with five roller gates and eight tainter gates. Earth embankment long with a grouted overflow spillway long. The lock is wide by long. Lock and Dam No. 9 is located 12 miles upstream from Prairie du Chien, Wisconsin.〔(【引用サイトリンク】url=http://www.mvp.usace.army.mil/Missions/Navigation/LocksDams/LockDam9.aspx )〕 ==References==
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「Lock and Dam No. 9」の詳細全文を読む
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