Louisiana Highway 18 (LA 18) is a state highway that serves Ascension, St. James, St. John the Baptist, St. Charles, and Jefferson Parishes. Called the Great River Road, it runs from west to east, parallel to the west bank of the Mississippi River, running from Donaldsonville to Gretna.
Louisiana Highway 18 (LA 18) is a state highway that serves five parishes in Louisiana: Ascension, St. James, St. John the Baptist, St. Charles, and Jefferson. It's also known as the Great River Road and runs from Donaldsonville to Gretna along the west bank of the Mississippi River.