Regulating tunnel releasing water at Garrison Dam
Photos by Eloise Ogden/MDN
Water is being released through a regulating tunnel, at right, at the Garrison Dam, shown Saturday. On Thursday, due to the forecasted rapid rise in Lake Sakakawea reservoir elevations, releases were increased to 44,000 cubic feet per second, according to the U.S. Army Corps of Engineers. In order to meet the 44,000 cfs release, 3,000 cfs releases were initiated through one of the three regulating tunnels. The release supplements the 41,000 cfs release through the adjacent power plant at the head of the tailrace area. The 44,000 cfs release rate is expected to continue through mid-July as water is evacuated from the exclusive flood control zone which is between elevations 1850.0 and 1854.0. The recent increase in releases is expected to increase the river stage near Bismarck by less than one foot.