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Category: Water Management - Missouri River
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  • Missouri Basin runoff slightly below average; draft Annual Operating Plan available for comment

    Runoff in the Missouri River Basin above Sioux City, Iowa for the month of September was just under 1.0 million acre feet (MAF), 84 percent of average. The 2015 runoff forecast is 24.9 MAF, 98 percent of average. Average annual runoff is 25.3 MAF. The total volume of water stored in the Mainstem Reservoir System is currently 59.3 MAF, occupying 3.2 MAF of the 16.3 MAF combined flood control storage zones. The plan is to evacuate all water stored in the flood zones of the reservoirs prior to the start of next year’s runoff season, which typically begins around March 1.

  • Missouri Basin runoff near average; Corps sets fall public meeting dates

    The U.S. Army Corps of Engineers Missouri River Basin Water Management Division reports runoff in the Missouri River Basin above Sioux City, Iowa, for August was 1.5 million acre feet (MAF), 108 percent of normal. The 2015 runoff forecast is 25.0 MAF, 99 percent of average. Average annual runoff is 25.2 MAF. System storage peaked in early July at 61.9 MAF, occupying 36 percent of the available flood storage.

  • Missouri River runoff below normal in July

    Runoff in the Missouri River Basin above Sioux City, Iowa, for the month of July was 2.7 million acre feet (MAF), 81 percent of normal. The 2015 runoff forecast is 25.0 MAF, 99 percent of normal. Average annual runoff is 25.2 MAF. The total volume of water stored in the Mainstem Reservoir System is currently 61.3 MAF, occupying 5.2 MAF of the 16.3 MAF combined flood control storage zones. System storage peaked on July 9 at 61.9 MAF and is gradually declining. The water currently stored in the annual flood control zone will be released during the remainder of the year to serve navigation, water supply and other downstream purposes and will be completely evacuated prior to the start of next year’s runoff season.

  • Missouri River Basin runoff remains above normal due to widespread rainfall

    Runoff in the Missouri River Basin above Sioux City, Iowa for the month of June was 6.8 million acre feet (MAF), 125 percent of normal. The 2015 runoff forecast is 26.6 MAF, 105 percent of normal. Average annual runoff is 25.2 MAF. June precipitation was above normal across much of the Missouri River Basin, most notably in the western Dakotas, eastern Montana and eastern Wyoming. Heavy rain also fell in eastern Nebraska, northeastern Kansas and much of Missouri.

  • Corps reports above normal May runoff in the Missouri River Basin; drought conditions improve in upper basin

    The U.S. Army Corps of Engineers Missouri River Basin Water Management Division reports May runoff in the Missouri River Basin above Sioux City, Iowa, was 3.7 million acre feet (MAF), 110 percent of normal. The 2015 runoff forecast has increased to 22.5 MAF, 89 percent of normal. Average annual runoff is 25.2 MAF.

  • Missouri River runoff half of average in April; Corps continues water conservation measures

    The U.S. Army Corps of Engineers Missouri River Basin Water Management Division reports April runoff in the Missouri River Basin above Sioux City, Iowa, was 1.5 million acre feet (MAF), 52 percent of normal. The 2015 runoff forecast in the Missouri River Basin above Sioux City, Iowa, has decreased 1 MAF from last month to 19.3 MAF, 76 percent of normal. Average annual runoff is 25.2 MAF.

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