A sign is seen lying on the ground atop sand bags on the back porch of Nolan Chiasson's home along the Atchafalaya River in Butte LaRose, Louisiana May 16, 2011. Residents of the Atchafalaya Basin have been forced to seek higher grounds due to rising flood waters associated with the opening of the Morganza spillway. Scores of U.S. heartland rivers from the Dakotas to Ohio have flooded following a snowy winter and heavy spring rains, feeding near-record crests on the lower Mississippi River. REUTERS/Sean Gardner (UNITED STATES - Tags: DISASTER ENVIRONMENT)