Missouri River Water Management Update

26 Apr 2018 11:04 AM | Glenda Johnson (Administrator)

Missouri River System Status and Flow Forecast:

The 2018 runoff forecast in the Missouri River Basin above Sioux City, Iowa, is 33.0 million-acre feet (MAF), 130 percent of normal according to the US Army Corps of Engineers Missouri River Water Management Division.  Based on the current plains and mountain snowpack, runoff into the Fort Peck and Garrison reservoirs is expected to be above average from March through July.  As of March 1, the Corps reported the mountain snowpack was 139-140 percent of average in the reaches above Fort Peck and from Fort Peck to Garrison. Normally the mountain snowpack peaks in mid-April.  Plains snowpack is currently heaviest in central and eastern Montana.  All 2017 stored flood waters were evacuated from the Missouri River mainstem reservoir system (System) as of January 15, when the total volume stored in the System reached 56.1 MAF; the bottom of the Flood Control & Multipurpose pool.  System storage is currently 59.1 MAF, occupying 3.0 MAF of the 16.3 MAF flood control zone.  System flood storage is reported to be currently available to capture runoff from the plains snowpack, spring rainfall and runoff from the mountain snowmelt.   


Releases from Gavins Point Dam have been adjusted from winter flows to provide flow for support for Missouri River navigation.  Flow support for navigation will be at full service levels for the first half of the 2018 season.  Flow support is generally sufficient to provide a 9-feet-deep by 300-feet-wide channel to support navigation.  Flow support for the second half of the Corps supported navigation season, as well as the navigation season length, will be based on the actual July 1 System storage; however, with storage anticipated the navigation support season is expected to be extended at least 10 days in 2018.  The Corps supported navigation season opening dates are as follows:

    ▪       Sioux City, IA: March 23

    ▪       Omaha, NE: March 25

    ▪       Nebraska City, NE: March 26

    ▪       Kansas City, MO: March 28

    ▪       Mouth near St. Louis, MO: April 1


MOARC Association
PO Box 22647
Kansas City, MO 64113

MOARC promotes the beneficial use of water and land related resources for the Missouri and associated rivers in the areas of    
Agriculture, Environment, Flood Damage Reduction, Navigation, Recreation, Shipping and Ports, Power, Water Quality and Supply.   

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