Missouri River Monthly Update - April 2026

Missouri Basin runoff sources include mountain snow, plains snow, and rainfall. The mountain snowpack in the upper Missouri River Basin is accumulating at below average rates. The April 2 mountain snowpack in the Fort Peck reach was 71% of average, while the mountain snowpack in the Fort Peck to Garrison reach was 65% of average. By April 1, about 96% of the total mountain snowfall has typically accumulated. Mountain snow normally peaks near April 17.