June Runoff Much Below Average
June runoff in the Missouri River Basin above Sioux City, Iowa was 3.3 million acrefeet, 60 percent of average. The updated 2025 calendar year runoff forecast for the Missouri River Basin above Sioux City, Iowa, continues to be below average.
“Mountain snowpack melted more rapidly than normal, and all reaches except the Sioux City reach experienced below normal precipitation during June,”
