Throughout the fall, Gavins Point dam releases are expected be above average.
The Gavins Point Dam will continue the higher than average released throughout the summer and fall, according to a release for the Missouri River Basin Water Management Division of the U.S. Army Corps of Engineers.
Releases at Gavins Point Dam averaged 49,600 cfs during July. Releases ranged from 26,000 to 58,000 cfs and, conditions permitting, will continue near 58,000 cfs during August. The Reservoir is expected to end at an elevation of 1206.5 feet after being at 1207.4 feet in July.
“Due to the water currently being stored in the reservoirs and the higher-than-average runoff being forecast in the Missouri River Basin above Sioux City, Iowa, Gavins Point releases will remain near 58,000 cfs for the remainder of the navigation season to ensure evacuation of all stored flood waters prior to next year’s runoff season,” said John Remus, Chief of the Missouri River Basin Water Management Division.
Above Sioux City, the Missouri River Basin is forecast to be 157 percent of the average at 39.8 millions acre feet (MAF). July’s runoff was 155 percent of the normal at 5.1 MAF.
Remus says that about 30 percent of the Missouri River mainstem reservoir system’s flood storage is available as of August 1, filling 11.3 MAF of the 16.3 flood control zone.
“The current amount of vacant flood control storage provides flexibility to lessen downstream flooding should suddenly-developing large rainfall events occur anywhere in the basin,” said Remus.
The six mainstem power plants typically generate 943 million kWh in July, but this year they generated 1,336 million kWh of electricity. For the year, they expect to generate 13.3 billion kWh of electricity. Their long-term average is 9.3 billions kWh of electricity.
Releases throughout the system will be reduced when needed to use flood control space.