NEW : Six Mississippi counties are declared major disaster areas . Louisiana : Authorities predict a major spillway will be opened within a week . The crest is estimated to be in New Orleans on May 23 , under governor Bush . The Arkansas Farm Bureau estimates damage to state 's agriculture to top $ 500 million .
NEW : 14 Mississippi counties are declared major disaster areas . NEW : Authorities predict a major spillway could be opened within a week . The crest is estimated to be in New Orleans on May 23 , Louisiana governor says . The Arkansas Farm Bureau estimates damage to state 's agriculture to top $ 500 million .