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Army Corps upgrading Garrison Dam spillway

By Bill Dubensky Jun 8, 2025 | 8:45 AM

Garrison Dam. (Amy Echols/U.S. Army Corps of Engineers via the North Dakota Monitor)

 

(BY: . North Dakota Monitor) – The U.S. Army Corps of Engineers is working on shoring up Garrison Dam’s spillway, which is used to release water from Lake Sakakawea when water levels are high.

Sen. Kevin Cramer, R-N.D., said that the Corps was spending $24 million for dredging and the placement of riprap protection of the spillway at Garrison Dam near Riverdale.

This work is part of the larger Garrison Dam Spillway Approach Rehabilitation Project and is expected to be completed in April 2028.

The Army Corps completed a study of Garrison Dam in June 2023. The dam holds back the Missouri River, creating Lake Sakakawea, the largest reservoir of any Army Corps project in the nation.

Flooding in 2011 caused Garrison Dam’s spillway to be used for the first time since it was completed in 1953.

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