Lock and Dam No. 7

Lock and Dam No. 7

Mississippi River Lock and Dam number 7
Location of the Lock and Dam No. 7 on the border of Wisconsin and Minnesota
Location Campbell, La Crosse County, Wisconsin / Dresbach Township, Winona County, Minnesota,
near La Crescent, Minnesota, USA
Coordinates 43°52′01″N 91°18′26″W / 43.86694°N 91.30722°W / 43.86694; -91.30722Coordinates: 43°52′01″N 91°18′26″W / 43.86694°N 91.30722°W / 43.86694; -91.30722
Construction began 1933
Opening date April 1937
Operator(s) United States Army Corps of Engineers
Dam and spillways
Impounds Upper Mississippi River
Length 940 feet (286.5 m) (movable portion)
Reservoir
Creates Pool 7
Total capacity 105,000 acre·ft (0.130 km3)
Catchment area 62,340 sq mi (161,500 km2)

Lock and Dam No. 7 is a lock and dam located near Onalaska, Wisconsin on the Upper Mississippi River. It forms pool 7 and Lake Onalaska.

The facility is located on Mississippi River mile 702.5 near La Crescent, Minnesota. It was constructed and placed in operation in April, 1937 and underwent major rehabilitation from 1989 through 2002.

The entire system consists of a concrete structure 940 feet (286.5 m) long with five roller gates and 11 tainter gates, a segment of earth embankment 8,100 feet (2,468.9 m) long from the dam to French Island separated by a concrete spillway 1,000 feet (304.8 m) long, and another embankment 2,400 feet (731.5 m) long from French Island to Onalaska which has a concrete spillway 670 feet (204.2 m) long. The lock is 110 feet (33.5 m) wide by 600 feet (182.9 m) long.[1]


See also

Notes

  1. ↑ "Lock and Dam 7". United States Army Corps of Engineers. Retrieved 2012-08-19.
Public Works Administration construction project 
PWA construction of Lock and Dam No. 7 
Lock and Dam No. 7 
Lock and Dam No. 7 
Locks and dams of the Upper Mississippi River
Upstream:
Lock and Dam No. 6		 Downstream:
Lock and Dam No. 8
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