Lock and Dam No. 3

Lock and Dam No. 3 is a lock and dam located near Red Wing, Minnesota on the Upper Mississippi River around river mile 796.9. It was constructed and placed in operation July 1938. The site underwent major rehabilitation from 1988 through 1991. The dam is 365 feet (111.3 m) long with 4 roller gates. More than 2,000 feet (609.6 m) of earth embankment with a series of upstream spot dikes completes the structure to create Pool 3. The lock chamber is 110 feet (33.5 m) wide by 600 feet (182.9 m) long. The lock and dam is owned and operated by the St. Paul District of the United States Army Corps of Engineers-Mississippi Valley Division.

Lock and Dam No. 3
Mississippi River Lock and Dam No. 3
Location of Lock and Dam No. 3 in Minnesota
Location	Red Wing, Goodhue County, Minnesota / Diamond Bluff, Pierce County, Wisconsin, United States.
Coordinates	44°36′36″N 92°36′37″W
Construction began	1935 (1935)
Opening date	July 1938 (1938)
Operator(s)	U.S. Army Corps of Engineers, St. Paul District
Dam and spillways
Impounds	Upper Mississippi River
Length	365 feet (111.3 m) (movable portion)
Reservoir
Creates	Pool 3
Total capacity	1,110,000 acre⋅ft (1.37 km3)
Catchment area	45,170 sq mi (117,000 km2)

Today, many types of vessels use the lock which annually passes more than 11 million tons of cargo, including farm products, chemicals and crude materials as the main items shipped. Each year more than 20,000 recreational craft use Lock 3, making it one of the most popular locks on the river. Also, a number of boats involved with fishing tournament utilize the lock.