 LA 47 makes the shape of the number "7" and begins as a north–south route that travels along Paris Road through Chalmette, an unincorporated suburb of New Orleans and the seat of neighboring St. Bernard Parish.North of Chalmette, LA 47 crosses a high-level bridge over the Gulf Intracoastal Waterway and transitions to a controlled-access freeway that doubles as Interstate 510 (I-510).This stretch contains interchanges with both I-10 and U.S. Highway 90 (US 90), two major routes heading east out of New Orleans.