SIOUX FALLS, S.D. - The Missouri River reservoirs gained 1 to 3 feet of water in May, the result of mountain snowmelt above the reservoir system and heavy rain below it, the Army Corps of Engineers said.
Releases from the reservoirs were about half the normal rate in May because of high downstream flows from the rain, the corps said. At the same time, flows on the Yellowstone River from the melting snow jumped from 4,400 cubic feet per second on May 1 to 35,000 cfs by the end of the month.
Runoff for the year is forecast at 38.6 million acre feet, or 84 percent of normal. The amount of water in storage on June 1 was 38.6 million acre feet, slightly more than a year earlier, the corps said.
Reservoir increases during May were 1.5 feet on Fort Peck, 2.9 feet on Garrison, 1.9 feet on Oahe, 0.3 feet on Big Bend, 0.8 feet on Fort Randall, and 1.1 feet on Gavins Point.