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  • Hydraulic models guide design of Garrison Dam spillway, mega dam safety project

    Engineers from the U.S. Army Corps of Engineers’ Omaha and Huntington districts and Risk Management Center are advancing the Garrison Dam Spillway Modification Project using scale models to enhance safety and improve the performance of the dam’s spillway near Riverdale, North Dakota.

  • Forecast shows Missouri River runoff returning to more normal levels after below-average 2025

    For the 2025 calendar year, Missouri River basin runoff above Sioux City, Iowa totaled 19.9 million acre-feet, 78% of average. For 2026, the U.S. Army Corps of Engineers is forecasting runoff in the Missouri River basin above Sioux City, Iowa to be near- average at 24.5 MAF, 96% of average.

  • Gavins Point Dam releases reduced to winter release rate

    Reduced releases from the Gavins Point Dam to the winter release rate on began Nov. 23 with the navigation flow support season ending on Dec. 1 at St. Louis. “Releases from Gavins Point Dam are being reduced to the 12,000 cubic feet per second winter release rate by mid-December,” said John Remus, Chief of the Missouri River Water Management Division. “We will closely monitor river conditions, and releases will be adjusted to the extent practical to lessen the impacts of river ice formation on stages in the lower river.”  Releases were at 26,000 cfs prior to the reductions.

  • Gavins Point Dam releases to be reduced to winter release rate

    Releases from Gavins Point Dam will be reduced in late November as flow support to navigation ends. Releases are currently 25,500 cubic feet per second (cfs). “We will continue to make releases from Gavins Point Dam to provide flow support at a level 4,500 cfs less than full service, through the end of the navigation flow support season, which ends on Dec. 1 at the mouth of the Missouri River,” said John Remus, chief of the USACE, Missouri River Water Management Division.

  • Virtual Missouri River fall public meeting in-lieu of canceled meetings

    In-person public meetings on Missouri River Mainstem Reservoir system operations, which were scheduled for Monday, Oct. 27; Monday, Nov. 3; and Tuesday, Nov. 4 have been canceled. A virtual meeting on Missouri River Mainstem Reservoir system operations is scheduled for Thursday, Oct. 30 to present the draft 2025-2026 Annual Operating Plan.

  • September runoff above average; Fall public meetings set

    Although overall runoff for September 2025 in the upper Missouri River Basin was above average, runoff in the Fort Peck and Garrison reaches continues to be well-below average. “Beneficial rainfall occurred over central South Dakota and North Dakota in September resulting in well-above average runoff into Oahe, Big Bend, Fort Randall, and Gavins Point,” said John Remus, chief of the U.S. Army Corps of Engineers’ Missouri River Basin Water Management Division.

  • System storage declining, Gavins Point Dam's winter releases will be minimum rate

    August runoff was 1.5 million acre-feet, 109% of average above Sioux City with most of the runoff entering the System below Garrison Dam. September runoff in the upper Basin is forecast to be well below average, especially in the Fort Peck and Garrison reaches. The updated 2025 calendar year forecast for the upper Basin is 19.1 MAF, 74% of average. Average annual runoff for the upper Basin is 25.7 MAF.

  • Garrison Dam team meets a paddling pal

    Kyle Parker, a Wisconsin native and canoe enthusiast, reached the U.S. Army Corps of Engineers, Omaha District's Lake Sakakawea Marina boat ramp, July 17, 2025. Parker is paddling from the tip of the Olympic Peninsula, Washington, to the southernmost tip of Florida.

  • Below normal runoff continues in the Upper Missouri Basin

    July runoff in the Missouri River Basin above Sioux City, Iowa was 2.0 million acre-feet (MAF), 62% of average. Runoff was below-average in the Fort Peck and Garrison reaches with average to above-average runoff in the lower four reaches. The annual runoff forecast above Sioux City, Iowa is 19.2 MAF, 75% of average.

  • Updated changes to traffic patterns at Garrison Dam

    The U.S. Army Corps of Engineers, Omaha District announces updates to traffic patterns for Garrison Dam Crest Road and Spillway Bridge due to summer maintenance and construction. The Crest Road lighting replacement is underway with completion expected Sept. 12, 2025, and Spillway Bridge concrete repair is scheduled for July 14 to Oct. 31, 2025. During these times, contractors will have traffic controls in place resulting in reduced speeds and one-lane travel. USACE appreciates the public’s understanding and slow passage through these work areas to help keep workers safe.