 Upon exiting Chalmette, the center lane gives way to a median, and the highway continues into the marshland atop a narrow strip of dry land lined with small marine-related industries.About later, LA 47 crosses a level bridge over Bayou Bienvenue into Orleans Parish and the city of New Orleans, which are co-extensive.The highway then crosses a high-level bridge over the much wider Gulf Intracoastal Waterway, an industrial shipping channel.