Many of the other improvements to LA 24 over the years have resulted from the construction and/or replacement of bridges along the route. In 1970, the western terminus at LA 20 in Schriever was converted from a simple T-intersection to a grade-separated interchange. This occurred when a four-lane overpass of the Southern Pacific Railroad (now the BNSF/UP) line was constructed on LA 20, moving the route off of what is now Old Schriever Highway, which crossed the tracks at grade. In 1979, a new bridge running diagonally across Bayou Blue on the Bourg-Larose Highway eliminated a zigzag at that point, straightening the roadway. In Houma, the two high-level bridges crossing the Gulf Intracoastal Waterway were constructed in 1996, replacing two grade-level movable bridges at the same location.