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The 2025 calendar year runoff forecast above Sioux City is 22.1 MAF, 86% of average. The runoff forecast is based on current soil moisture conditions, plains snowpack, mountain snowpack, and long-term precipitation and temperature outlooks. In February, the runoff forecast was 20.6 MAF, which was 80% of average. Average is 25.7 MAF. The Mountain snowpack in the upper Missouri River Basin is accumulating at below average rates. The March 3 mountain snowpack in the Fort Peck reach was 89% of average, while the mountain snowpack in the Fort Peck to Garrison reach was 91% of average. By March 1, about 79% of the total mountain snowfall has typically accumulated. Mountain snow normally peaks near April 17.

Upper Missouri River Basin runoff stays below average in February

By DRG Media Group News Mar 7, 2025 | 6:00 AM

The updated 2025 calendar year runoff forecast for the Missouri River Basin above Sioux City, Iowa, continues to be below average.

The U.S. Army Corps of Engineers says February runoff in the upper Missouri River Basin was 91% of average. The 2025 calendar year runoff forecast above Sioux City is 86% of average. The runoff forecast is based on current soil moisture conditions, plains snowpack, mountain snowpack and long-term precipitation and temperature outlooks.

The six mainstem power plants generated 527 million kWh of electricity in February, lower than the typical energy generation for the month of 615 million kWh. Forecast power generation for 2025 is 8.8 billion kWh, compared to the long-term average of 9.4 billion kWh.

To view the detailed three-week release forecast for the mainstem dams, go to http://go.usa.gov/xVgWr.

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