Lock and Dam No. 8 is a lock and dam located near Genoa, Wisconsin on the Upper Mississippi River near river mile 679.2 in the United States. It was constructed and was put into operation by April 1937. The site then underwent major rehabilitation from 1989 through 2003. The lock and dam are owned and operated by the St. Paul District of the United States Army Corps of Engineers-Mississippi Valley Division.

Quick Facts Location, Coordinates ...

Lock and Dam No. 8
Mississippi River Lock & Dam #8
Location of Lock and Dam No. 8 in Wisconsin
Location	Genoa, Vernon County, Wisconsin / Houston County, Minnesota, United States
Coordinates	43°34′12″N 91°13′54″W
Construction began	1933; 91 years ago (1933)
Opening date	April 1937; 87 years ago (1937)
Operator(s)	U.S. Army Corps of Engineers, St. Paul District
Dam and spillways
Impounds	Upper Mississippi River
Reservoir
Creates	Pool 8
Total capacity	260,000 acre⋅ft (0.32 km3)
Catchment area	64,770 sq mi (167,800 km2)

Close

The dam consists of a concrete structure 934 feet (284.7 m) long with five roller gates and 10 tainter gates. The earth embankment is 17,500 feet (5,334.0 m) long with two submersible spillways, 938 feet (285.9 m) long and 1,338 feet (407.8 m) long. The lock is 110 feet (33.5 m) wide by 600 feet (182.9 m) long.

• Lock and Dam No. 8
• Lock and dam 8 spill way

• Public Works Administration dams list
• Upper Mississippi River National Wildlife and Fish Refuge

Wikimedia Commons has media related to Mississippi River Lock and Dam number 8.

• U.S. Army Corps of Engineers, St. Paul District: Lock and Dam 8
• U.S. Army Corps of Engineers, St. Paul District: Lock and Dam 8 brochure
• USGS Reach 1, Pool 8
• Historic American Engineering Record (HAER) No. WI-49, "Upper Mississippi River 9-Foot Channel, Lock & Dam No. 8, Genoa, Vernon County, WI", 120 photos, 10 data pages, 9 photo caption pages