The updated 2026 calendar year runoff forecast for the Missouri River Basin above Sioux City, Iowa, continues to be below average. April runoff in the Missouri River Basin above Sioux City was 1.5 million acre-feet, 51% of average.
“Runoff into the reservoir system was below average for the month of April due to lack of plains snowpack and precipitation,” said John Remus, chief of the U.S. Army Corps of Engineers’ Missouri River Basin Water Management Division. “Dry conditions are present in 74% of the basin, and drought conditions are expected to persist through July with some expansion likely in Montana and South Dakota. As a result, the runoff forecast was lowered by 0.7 MAF from last month.”
The 2026 calendar year runoff...
MISSOURI RIVER MAINSTEM RESERVOIR DATA Pool Elevation (feet above mean sea level) On April 30 Change in April Water in Storage (1,000 acre-feet) On April 30 % of 1967-2025 Average Change in April Fort Peck 2222.9 +0.6 12,605 89 +99 Garrison 1827.1 -0.2 14,747 86 -43 Oahe 1600.1 -1.3 16,471 90 -472 Big Bend 1420.9 +0.5 1,683 99 +18 Fort Randall 1355.1 +1.2 3,405 89 +86 Gavins Point 1206.5 +0.4 340 93 +9 Total 49,251 89 -303 WATER RELEASES AND ENERGY GENERATION FOR MARCH Average Release in 1,000 cfs Releases in 1,000 acre-feet Generation in Million kWh Fort Peck 4.8 287 44 Garrison 14.2 847 123 Oahe 23.2 1,383 204 Big Bend 23.1 1,375 74 Fort Randall 21.9 1,301 141 Gavins Point 23.8 1,418 62 Total 648
The U.S. Army Corps of Engineers Seattle District celebrated its 130th anniversary during a commemorative event in Seattle, Washington, May 1, 2026.
The video highlights the district's history, engineering achievements, and ongoing missions supporting navigation, flood risk management, hydropower, environmental stewardship, and military construction throughout the Pacific Northwest.
Established in 1896, the Seattle District has played a key role in shaping regional infrastructure and supporting national defense through engineering expertise and public service.
