From the west, LA 74 begins at an intersection with
LA 75 in
St. Gabriel, a small city in eastern
Iberville Parish. LA 75 follows the east bank levee of the
Mississippi River, heading toward
Carville on the south and connecting with the
Plaquemine Ferry via
Sunshine on the north. LA 74 proceeds east and crosses the
Canadian National Railway (CN) tracks at grade. Immediately afterward, it intersects
LA 30, which connects to
Baton Rouge on the north. LA 30 also parallels LA 74 toward
Gonzales and provides access to
I-10. LA 74 proceeds eastward through a narrow strip of residential development, and after , passes by the entrance to the
Elayn Hunt Correctional Center, the state's second largest prison. later, the surroundings abruptly change to an uninhabited and thickly forested area. At the same time, LA 74 curves to the southeast and continues for before intersecting
LA 3115, which runs alongside the petrochemical facilities between LA 30 and the Mississippi River. Immediately afterward, LA 74 exits the St. Gabriel city limits, simultaneously crossing from Iberville Parish into
Ascension Parish. East of I-10, the residential development becomes slightly more sparse. past the overpass, LA 74 intersects
LA 938 (Coon Trap Road), which zigzags in a general southeastern direction into the center of Gonzales. later, LA 74 curves to the northeast and crosses the
Kansas City Southern Railway (KCS) tracks. Shortly afterward, the route ends at an intersection with
US 61 (
Airline Highway) at a point just north of Gonzales. US 61 parallels I-10 between Baton Rouge to the northwest and
New Orleans to the southeast. Average daily traffic volume in 2013 is reported as 4,900 vehicles within St. Gabriel, increasing to 11,800 between the city limits and LA 73. The traffic count then decreases to 9,600 and finally to 7,900 east of LA 938. The posted speed limit is within the populated section of St. Gabriel, increasing to to the I-10 overpass, after which it is slightly decreased to for the remainder of the route. LA 74 is an undivided, two-lane highway for its entire length. ==History==