Gators yes cottonmouths no. We have a 4 ft gator the lives right across the bayou from our house and an 11 footer that swims by once or twice a day. As far as snakes what has happened in and around the Atchafalaya is amazing. Snakes are very very rare even common water snakes are not around. The reason? GATORS! They have wiped out most of the snakes along with all the nutria. Haven't see a nutria in the Atchafalaya in 15 years and seen only one snake in the last 9 years . The gator population has exploded to the point there are reality shows like Swamp People now. Was also fairly common to see otter but rarely have I seen one lately. Much perfer gators over snakes.