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Lock & Dam 1

Open House: We will host an open house Saturday, July 18 from 11 a.m. to 3 p.m.

  • 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

2015 lockage service hours

Lock & Dam 1

10 a.m. - 8 p.m.

Recreation Opportunities

The observation deck is open
Monday - Friday, 7 a.m. to 7:30 p.m.
Saturday - Sunday, 10:30 a.m.
to 7:30 p.m.

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