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Lock and Dam No. 3 is a lock and dam located near Red Wing, Minnesota on the Upper Mississippi River around river mile 796.9. It was constructed and placed in operation July 1938. The site underwent major rehabilitation from 1988 through 1991. The dam is long with 4 roller gates. More than of earth embankment with a series of upstream spot dikes completes the structure to create Pool 3. The lock chamber is wide by long. Today, many types of vessels use the lock which annually passes more than 11 million tons of cargo, including farm products, chemicals and crude materials as the main items shipped. Each year more than 20,000 recreational craft use Lock 3, making it one of the most popular locks on the river. Also, a number of boats involved with fishing tournament utilize the lock. ==External links== *(U.S. Army Corps of Engineers, St. Paul District Lock and Dam 3 ) *(U.S. Army Corps of Engineers, St. Paul District: Lock and Dam 3 brochure ) *(Survey number HAER MN-21 - Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 3, Red Wing vicinity, Goodhue County, MN ) 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. 3」の詳細全文を読む スポンサード リンク
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