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 620 feet (189.0 m). 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 811 feet (247.2 m) long with five roller gates and eight tainter gates. Earth embankment 9,800 feet (2,987.0 m) long with a grouted overflow spillway 1,350 feet (411.5 m) long. The lock is 110 feet (33.5 m) wide by 600 feet (182.9 m) long. Lock and Dam No. 9 is located 12 miles upstream from Prairie du Chien, Wisconsin.[1] The lock and dam are owned and operated by the St. Paul District of the United States Army Corps of Engineers-Mississippi Valley Division.
Images
See also
- Blackhawk Park
- Public Works Administration dams list
- Upper Mississippi River National Wildlife and Fish Refuge
References
- ^ "Lock & Dam No. 9". Army Corps of Engineers. Retrieved 30 April 2014.
External links
- U.S. Army Corps of Engineers, St. Paul District: Lock and Dam 9
- U.S. Army Corps of Engineers, St. Paul District: Lock and Dam 9 brochure
- Blackhawk Park - U.S. Army Corps of Engineers Park
- Lock and Dam No. 9 Fishing Forum
- USGS Reach 1, Pool 9
- Historic American Engineering Record (HAER) No. WI-50, "Upper Mississippi River 9-Foot Channel, Lock & Dam No. 9, Lynxville, Crawford County, WI", 83 photos, 12 data pages, 6 photo caption pages
- Friends of Pool 9 - Nonprofit organization dedicated to keeping the pool clean, managing annual volunteer cleanups, particularly of backwaters
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