Part One, Flooded Duck River, Centerville, Tennessee

Flooded Duck River, Centerville, Tennessee, three days after the rain ended ... Winding 269 miles through Middle Tennessee, the Duck River is one of the state's most scenic waterways. But there's more here than meets the eye. Underneath the surface, the river teems with an almost unsurpassed variety of freshwater animal life. According to the U.S. Geological Survey, the Duck River is one of three hot spots for fish and mussel diversity in the entire world. It is generally considered to be the richest river in varieties of freshwater animals on the North American continent.