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Gavins Point Dam

Water flows through Gavins Point Dam near Yankton, S.D., in 2011. Runoff into the Missouri River above Sioux City is forecast to be 115 percent of normal in 2018, the U.S. Army Corps of Engineers said. Releases from the dam are expected to increase up to 26,000-28,000 cubic feet per second later this month to support navigation downstream.

Jim Lee, Sioux City Journal file

OMAHA | Releases from Gavins Point Dam have been reduced to lessen downstream flooding caused by heavy rainfall in the past week.

The U.S. Army Corps of Engineers cut releases from the dam near Yankton, South Dakota, from 31,000 cubic feet per second to 26,000 cfs. Releases will be increased back to 31,000 cfs as downstream flows recede.

Releases will eventually be reduced to 17,000 cfs for the winter.

The six Missouri River reservoirs currently hold 59.2 million acre-feet of water, occupying 3.1 MAF of the 16.3 MAF combined flood control zones. Water will be evacuated from the reservoirs throughout the fall and winter so the reservoirs are at 56.1 MAF when the spring runoff season begins.

September runoff into the Missouri River above Sioux City was 1 MAF, 91 percent of normal. The 2017 runoff forecast is for 28.5 MAF, 112 percent of normal.


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