 After , LA 82 turns east again at Oak Grove, the location of the region's high school as well as the Catfish Point Control Structure, a saltwater intrusion barrier.east of Oak Grove, LA 82 crosses a swing bridge over the Mermentau River into Grand Chenier.The highway travels along a grassy ridge ("chenier") through the community, which consists of a string of homes on the north side of the road that are interspersed with large oak trees.