Members of the U.S. Army Corps of Engineers ride in air boats as they open up bays along the Mississippi River to the Bonnet Carre spillway in Norco, Louisiana May 9, 2011. The Mississippi River was approaching record flood levels and forcing area residents from their homes. Officials opened portions of the Bonnet Carre spillway near the refining hub of Norco, Louisiana, to send Mississippi River water to Lake Pontchartrain. REUTERS/Sean Gardner (UNITED STATES - Tags: DISASTER ENVIRONMENT)