September runoff below average; October public meetings
The 2026 calendar year runoff forecast for the Missouri River Basin above Sioux City, IA is 16.3 MAF, 63% of average and 0.9 MAF more than last month’s forecast. As of October 1, the total volume of water stored in the System was 46.1 MAF, which is 10 MAF below the base of the System’s flood control zone. System storage is forecasted to continue declining through the fall. The Northwestern Division will host a series of public meetings the week of Oct. 26.
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