Thanks for the tip. I called the Iberville Sherrif Office. The two women in the office were not helpful at all. This is the launch:
http://lamarinas.losco.lsu.edu/boat-...d=20020107-1-2
On La 69 south of White Castle, take La 404 west about 2.1 miles, turn south on La 993, about 1.3 miles east of Lone Star; ramp is located in the center of a right angle bend in road.