BISMARCK, N.D. – The U.S. Army of Engineers (USACE) announced a contract of $23,816,251 for dredging and the placement of riprap protection in support of the spillway at Garrison Dam near Riverdale. This work advances the Garrison Dam Spillway Approach Rehabilitation Project and is expected to be completed by April 28, 2028.
Built in 1953, the Garrison Dam is the second-most upstream project of six which were built on the mainstem of the upper Missouri River and has the largest reservoir storage capacity of all USACE projects in the nation. When combined with dams on the river’s tributaries, the projects reduce the risk of downstream flooding along the Missouri and Mississippi rivers. This mainstem system of dams is managed to balance hydropower generation, water supply, water quality, irrigation, fish and wildlife conservation, navigation, and recreation benefits.