sentences:  It then followed the current routes of LA 327 and LA 75 to Geismar, generally following the river levee but cutting across some of its sharper bends.The pre-1955 State Route 1 continued the route downriver from Geismar toward Darrow and also branched northeast from the river toward Prairieville.This terminus was once a major junction, as Route 1 (known as the Jefferson Highway) carried through traffic between New Orleans and Baton Rouge as part of US 61 until the Airline Highway was opened in 1933.