US Army Corps of Engineers
St. Paul District Website

Lock & Dam 7

  • Located on Mississippi River mile 702.5 near LaCrescent, Minn.
  • Constructed and placed in operation in April, 1937. Site underwent major rehabilitation from 1989 through 2002.
  • Dam consists of concrete structure 940 feet long, five roller gates and 11 tainter gates. Two segments of earth embankment 8,100 feet long from dam to French Island. One concrete spillway 1,000 feet long. And 2,400 feet long from French Island to Onalaska Wis. The a concrete spillway is 670 feet long.
  • Lock is 110 feet wide by 600 feet long.
  • Brochure

Recreation Opportunities

The observation deck is currently OPEN.

Lock and Dam 7
Lock and Dam 7, La Crescent, Minn.

Contact Information

U.S. Army Corps of Engineers
St. Paul District
Lock and Dam No. 7

33018 Highway 61
La Crescent, MN 55947-9502

(507) 895-2170