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U.S. Army Corps of Engineers
St. Paul District
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St. Paul MN 55101

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Posted 2/26/2015

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Updated March 2017


Location/Description
Lock and Dam 1 is located on the Minneapolis side of the Mississippi River. The purpose of this project is to re-establish armor downstream of the concrete apron. The existing rock protection consists of grouted derrick stone. This stone bedding has broken up and washed downstream, exposing bedding material and risking failure of the wooden piles and sheet pile located underneath the existing concrete apron.



Status
A cursory analysis was performed in FY13 on the existing condition of the structure. It was determined placing riprap 200 feet from the concrete apron downstream would be the most efficient and effective solution. The existing grouted riprap will be removed from the site during construction and excess material immediately downstream of the concrete apron will be excavated and used to smooth out the downstream topography.

Plans and specifications were completed in FY15 with a construction contract awarded in September 2015. Construction was adjusted one year due to continued high water. The project is scheduled to be completed in November 2017.

Authority
The project was authorized as part of the Rivers and Harbors Act approved July 3, 1930.

Fiscal
Project design and construction costs are 100 percent Federal.

FY14 funding:         $100,000
FY15 funding:      $2,500,000
FY16 funding:         $100,000
FY17 funding:          $100,000

Total project costs estimate: $2,800,000

Ambursen Dam Downstream Repair dam safety Lock and Dam 1 Mississippi River St. Paul District U.S. Army Corps of Engineers