Widespread and heavy rainfall in the Missouri River basin above Sioux City, IA (upper basin) resulted in another month of above average runoff. Precipitation during August was more than 150 percent of normal in eastern Montana, portions of North Dakota, much of South Dakota and Nebraska. As a result, the Fort Randall and Gavins Point reaches experienced their wettest Augusts on record, while the Sioux City and Oahe reaches were second and third, respectively.