Herons stand and wait for fish in the Bonnet Carre Spillway. On Monday, workers opened some of the spillway's wooden barriers, which serve as a dam against the high water in Norco, La., in anticipation of rising floodwater. The spillway, which the Army Corps of Engineers built about 30 miles upriver from New Orleans in response to the great flood of 1927, last opened in 2008. (AP)