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Lock and Dam No. 7
Mississippi River Lock and Dam number 7.jpg
Mississippi River Lock and Dam number 7
Impounds Upper Mississippi River
Locale La Crescent, Minnesota
Length 940 feet (286.5 m) (movable portion)
Construction began 1933
Opening date April 1937
Reservoir information
Creates Pool 7
Geographical Data
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
Maintained by United States Army Corps of Engineers

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, Wisconsin to Onalaska, Wisconsin 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]

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Coordinates: 43°52′01″N 91°18′26″W / 43.8669095°N 91.3070842°W / 43.8669095; -91.3070842

Locks and dams of the Upper Mississippi River
USAFLSAF123455A67891011121314151617181920212224252627
Upstream:
Lock and Dam No. 6
Downstream:
Lock and Dam No. 8
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