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Missouri River navigation support; full-length season, reduced service levels

Missouri River Water Management Division
Published July 1, 2021
System storage is 55.3 MAF, 0.2 MAF less than last week 
Upper Basin runoff during the first 4 weeks of June was 57% of average
Mountain snowpack has melted.
Over the last 7 days, the lower basin has seen significant precipitation resulting in flooding on tributary streams and the lower Missouri River.
Navigation support for the 2nd half of the navigation season (July 1 to December 1) will likely be 1,500 to 2,000 cfs less than full service.
The navigation season length will be a full 8-month season.
Winter releases from Gavins Point Dam are forecast to be at the minimum rate of 12,000 cfs.

System storage is 55.3 MAF, 0.2 MAF less than last week Upper Basin runoff during the first 4 weeks of June was 57% of average Mountain snowpack has melted. Over the last 7 days, the lower basin has seen significant precipitation resulting in flooding on tributary streams and the lower Missouri River. Navigation support for the 2nd half of the navigation season (July 1 to December 1) will likely be 1,500 to 2,000 cfs less than full service. The navigation season length will be a full 8-month season. Winter releases from Gavins Point Dam are forecast to be at the minimum rate of 12,000 cfs.

The Missouri River Water Management Division will reduce navigation flow support beginning today for the second half of the navigation flow support season. 

“We continue to monitor conditions throughout the basin and make adjustments as necessary. We will provide a full update for key stakeholders and the media on our regular July 8 call,” said John Remus, chief of the Missouri River Water Management Division. 

Per the July 1 System storage check, and as outlined in the Missouri River Mainstem Reservoir System Master Water Control Manual, the service level to support navigation will be reduced 1,500 cubic feet per second from full-service levels.  The 2021 navigation flow support season length will be a full 8-months, ending on Dec. 1 at the mouth in St. Louis.

Drought conditions continue in the upper Missouri River basin.  Reducing navigation flow support is a necessary water conservation measure to ensure continued service to all the authorized purposes for the short- and long-term.  The decrease in stage due to the reduced flow support will be less than half a foot. Actual stages will depend on the amount, timing, and location of tributary inflow below Gavins Point dam.

For more information, visit the links listed below. 


Contact
Eileen Williamson
402-996-3802
eileen.l.williamson@usace.army.mil

Release no. 21-043