The National Weather Service in St Louis has issued a Flood Warning for the following rivers in Illinois. Missouri. Mississippi River at Clarksville. Mississippi River at Louisiana. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT. Minor flooding is forecast. * WHERE. Mississippi River at Clarksville. * WHEN. From Sunday morning until further notice. * IMPACTS. At 27.2 feet, Silo Park just northwest of Clarksville off Highway 79 begins flooding. * ADDITIONAL DETAILS. - At 2:30 PM CDT Saturday the stage was 24.2 feet. - Forecast. The river is expected to rise above flood stage late tomorrow morning and continue rising to a crest of 26.6 feet Tuesday morning. - Flood stage is 25.0 feet.