Duplessis Road to be closed Wednesday Duplessis Road to be closed Wednesday Advocate staff report May 11, 2014 Comments PRAIRIEVILLE — Duplessis Road, a key cut-through road in northwestern Ascension Parish, will be closed west of Airline Highway from 7 a.m. Tuesday to 4 p.m. Wednesday, parish government officials said Monday. Kansas City Southern Railway Co. will be making repairs to the tracks that cross Duplessis near Airline to make vehicle traffic smoother, parish official said in a news release. The Kansas City tracks run parallel to Airline about two-tenths of mile west of the highway. Alternative routes from Airline into the neighborhoods surrounded by Airline, I-10, La. 621 and La. 73 include La. 73, Post Office Road and La. 621.