 During this stretch, LA 15 has a diamond interchange with I-20 and passes the Monroe Civic Center.In Downtown Monroe, LA 15 turns west and runs concurrent with US 80 across the Ouachita River and into the neighboring city of West Monroe.Just beyond the Lea Joyner Bridge, US 80 and LA 15 intersect LA 34 then zigzag through town, intersecting several major thoroughfares that provide access to the parallel I-20.