...The Flood Warning continues for the following rivers in Iowa... Cedar River at Cedar Falls affecting Black Hawk County. Shell Rock River at Shell Rock affecting Bremer, Black Hawk and Butler Counties. ...The Flood Warning is extended for the following rivers in Iowa... Winnebago River at Mason City affecting Worth, Floyd and Cerro Gordo Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...The Winnebago River at Mason City, or from Beaver Creek near Fertile to the Shell Rock River near Rockford. * WHEN...Until early Thursday morning. * IMPACTS...At 11.0 feet, Sandbagging occurs on the dike from 12th St NE to Carolina St. * ADDITIONAL DETAILS... - At 7:15 PM CDT Tuesday the stage was 10.7 feet. - Forecast...The river is expected to fall below flood stage tomorrow evening and continue falling to 7.3 feet Tuesday, August 26. - Flood stage is 10.0 feet.