US Army Corps of Engineers
St. Paul District

Projects

Mississippi River 9-Foot Project, Locks and Dams

Published Feb. 27, 2015
Updated: March 21, 2019
Lock and Dam 6, near Tremplealeau, Wis.

Lock and Dam 6, near Tremplealeau, Wis.

Lock and Dam 3, Welsh, Minn. Upper Mississippi River mile 796.9.

Lock and Dam 3, Welsh, Minn. Upper Mississippi River mile 796.9.

Lock and Dam 6, Trempealeau, Wis. Upper Mississippi River mile 714.1

Lock and Dam 6, Trempealeau, Wis. Upper Mississippi River mile 714.1

Lock and Dam 5, Minnesota City, Minn. Upper Mississippi River mile 738.1

Lock and Dam 5, Minnesota City, Minn. Upper Mississippi River mile 738.1

Lock and Dam 5A, between Fountain City, Wis., and Winona, Minn. Upper Mississippi River mile 728.5

Lock and Dam 5A, between Fountain City, Wis., and Winona, Minn. Upper Mississippi River mile 728.5

Lock and Dam 10, Guttenburg, Iowa. Upper Mississippi River mile 615.0

Lock and Dam 10, Guttenburg, Iowa. Upper Mississippi River mile 615.0

Lock and Dam 1, Minneapolis, Minn. Upper Mississippi River mile 847.9

Lock and Dam 1, Minneapolis, Minn. Upper Mississippi River mile 847.9

Location/Description

The U.S. Army Corps of Engineers, St. Paul District is responsible for maintaining 244 miles of the Upper Mississippi River 9-foot channel navigation system from the head of navigation in Minneapolis, Minnesota to Guttenberg, Iowa.  The Upper Mississippi River 9-Foot Channel Navigation Project is located in or contiguous to Minnesota, Wisconsin and Iowa.  The navigation project within the St. Paul District includes 13 locks and dams that are operated and maintained by the Corps.  In addition to the locks and dams the project includes channel maintenance, recreation and natural resource activities.

Approximately 18 million tons of cargo travels through the St. Paul District each year.  The system’s infrastructure is comprised of 10 lock chambers 600 feet long, 3 lock chambers 400 feet long, 170 dam gates, 8 fixed crest spillways and 16 miles of embankments acting as dams.  Each lock chamber includes two sets of operable steel gates controlling entry to and exit from the lock.

Status

In fiscal year 2019, operations and maintenance funding will be used to accomplish the following activities necessary to maintain navigation: 

  • Upper St. Anthony Falls Lock and Dam, flood control tainter gate rehabilitation.
  • Lock and Dam 2, dam tainter gate chain replacement.
  • Lock and Dams 5 and 5A, install auxiliary chamber sheetpile.
  • Lock and Dam 6, tow rail replacement.
  • Lock and Dam 6, new end cell. 
  • Locks and Dams 4, 5, 5A, 8 and 9, guide wall crib repairs.
  • Locks and Dams 5A, 8 and 10, fabricate miter gates.

In fiscal year 2019 we will award contracts for:

  • Lock and Dam 2, miter gate anchorage replacement. 
  • Locks and Dams 4, 5, 5A, 7, 8 and 9, tow rail replacement.

The following are critical maintenance projects that could be completed once funded:  

  • Locks and Dams 8, 5A and 10 miter gate anchorage replacement.
  • Locks and Dams 3, 4, 6, 9 and 10, aux chamber closures.
  • Locks and Dams 5 and 5A, paint dam bridge and gates. 
Authority

The project was authorized as part of the River and Harbor Act approved July 3, 1930.  The act authorized the construction, repair and preservation of public works on river and harbors and for other purposes.

Fiscal

Operation and maintenance of the project is funded annually under the Corps’ Civil Works Operation and Maintenance appropriation.  Mississippi River funding allocated to the St. Paul District in recent fiscal years has ranged from $50 to $60 million.