The Flood Warning is extended for the following rivers in Iowa. South Dakota. Big Sioux River at Sioux City affecting Union and Woodbury Counties. Big Sioux River at Sioux Falls I-90 affecting Minnehaha County. Big Sioux River near Brookings affecting Brookings and Moody Counties. Big Sioux River below Dell Rapids affecting Minnehaha County. . The Flood Warning continues for the following rivers in Iowa. South Dakota. Minnesota. Rock River at Rock Valley affecting Sioux and Lyon Counties. Rock River at Rock Rapids affecting Lyon County. Big Sioux River near Jefferson affecting Union and Plymouth Counties. Brule Creek near Richland affecting Union County. Big Sioux River above Dell Rapids affecting Moody and Minnehaha Counties. Big Sioux River near Egan affecting Moody County. Big Sioux River near Trent affecting Moody County. Flandreau Creek near Flandreau affecting Moody and Pipestone Counties. Big Sioux River near Richland affecting Union and Plymouth Counties. Big Sioux River at Brandon affecting Lincoln, Minnehaha and Lyon Counties. Big Sioux River at Sioux Falls Western Ave affecting Lincoln and Minnehaha Counties. Big Sioux River at Akron affecting Union and Plymouth Counties. Big Sioux River above Hawarden affecting Sioux, Lincoln and Union Counties. Big Sioux River near Canton affecting Sioux, Lincoln and Lyon Counties. Beaver Creek at Canton affecting Lincoln County. Split Rock Creek near Corson affecting Minnehaha County. Split Rock Creek below Jasper affecting Pipestone, Rock and Minnehaha Counties. Rock River near Hardwick affecting Rock County. * WHAT. Major flooding is occurring. * WHERE. Big Sioux River near Canton. * WHEN. Until further notice. * IMPACTS. At 1245.0 feet, Highway 18 begins to flood and major damage will occur to trees and fences throughout the flood plain. * ADDITIONAL DETAILS. - At 11:00 AM CDT Monday the stage was 1243.7 feet. - Recent Activity. The maximum river stage in the 24 hours ending at 11:00 AM CDT Monday was 1245.3 feet. - Forecast. No forecast is available for this location. - Flood stage is 1235.0 feet. - http://www.weather.gov/safety/flood