US Army Corps of Engineers
St. Paul District Website

Lock & Dam 1

  • Located on Mississippi River mile 847.9, in Minneapolis.
  • Construction completed in 1917, reconstructed in 1929. Main Lock completed May 1932. Last major rehabilitation 1978-1983.
  • Dam consists of Ambursen concrete overflow structure 574' long, hydro power station owned and operated by Brookfield Power Co.
  • Lock is 56' wide by 400' long. River Lock 56' wide by 400' long.
  • It is the only twin lock in the district.
  • Brochure
The district is conducting disposition studies to examine the benefits and costs of continuing to operate federal projects which are no longer serving their authorized purpose.

Lockage service hours

Lock & Dam 1

10 a.m. - 8 p.m.

Recreation Opportunities

The visitor center is closed for the season. We will see you next spring!

Lock and Dam 1
Lock & Dam 1, Minneapolis, Minn.

Contact information

U.S. Army Corps of Engineers
St. Paul District
Lock and Dam 1

5000 West River Parkway
Minneapolis, MN 55417-1609
(651) 290-5919