 Alternately, motorists may cross the river via LA 1 at Simmesport, to the north.From the west, LA 10 begins at an intersection with US 171 in Pickering, a point in Vernon Parish located between DeRidder and Leesville.It proceeds east as an undivided two-lane highway, immediately crossing the Kansas City Southern Railway (KCS) tracks, and passes along the southern edge of the U.S. Army base at Fort Polk.