I wanted to include a link to the Advanced Hydrologic Prediction Service. You can go here to get the latest river stages and river level forecasts.
As of this writing, several locations are looking at a forecast for moderate to major flooding.
On the Meramec River, moderate flooding is forecast at Steelville, Sullivan, Pacific and Arnold. Major flooding is forecast on the Meramec near Eureka and Valley Park.
Moderate flooding is forecast for the Big River at Byrnesville, the North River at Palmyra, the Black River near Annapolis and the Kaskaskia at Vandalia.