Lock and Dam No. 9

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Mississippi River Lock and Dam number 9.jpg
Mississippi River Lock and Dam No. 9
Location Taylor Township, Allamakee County, Iowa / Seneca, Crawford County, Wisconsin,
near Lynxville, Wisconsin, USA
Coordinates 43°12′46″N 91°06′15″W / 43.21278°N 91.10417°W / 43.21278; -91.10417Coordinates: 43°12′46″N 91°06′15″W / 43.21278°N 91.10417°W / 43.21278; -91.10417
Construction began 1936
Opening date July 1937
Operator(s) United States Army Corps of Engineers
Dam and spillways
Impounds Upper Mississippi River
Creates Pool 9
Total capacity 470,000 acre·ft (0.58 km3)
Catchment area 66,610 sq mi (172,500 km2)

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]


Lock and Dam No. 9
Ground view from WIS35

See also[edit]


  1. ^ "Lock & Dam No. 9". Army Corps of Engineers. Retrieved 30 April 2014. 

External links[edit]

Locks and dams of the Upper Mississippi River
Lock and Dam No. 8
Lock and Dam No. 10