Garrison Dam Spillway Operations
On Monday, August 6, 2018 releases of 9,000 cubic feet per second were transitioned from the regulating tunnels to the spillway at Garrison Dam near Riverdale, North Dakota. The spillway had not operated since 2011. The transition allows an operational test of the repairs made following 2011 the release amount is consistent with the flows released through the regulating tunnels and would not be noticeable downstream. Each gate was opened 1 foot.