 A short piece of LA 1 connects the Great River Road to LA 405, which hugs the river to another junction with LA 1 in Plaquemine.LA 988 loops off LA 1 from northern Plaquemine back to yet another junction south of Port Allen, where the route leaves LA 1 again on Oaks Avenue, which becomes LA 987-5 and turns north along the river on River Road.LA 987-4 (Court Street) leads back west to Jefferson Avenue, which the Great River Road follows north to LA 986 along the river and under the Huey P. Long Bridge (US 190), which carries the National Route to the east bank (with access via LA 987-1).