Overnight ramp closures on westbound US 20/US 75 bypass in Sioux City begin tonight SIOUX CITY (KTIV) - A asphalt project on the westbound U.S. 20/U.S. 75 bypass in Sioux City will require overnight ramp closures, according to the Iowa Department of Transportation. The DOT says, on June 28 and on June 29, interchange ramps at Morningside Avenue, Sunnybrook Drive and Lakeport Road will have to be closed from 6 p.m to 6 a.m. DOT officials say each ramp should be closed for about two hours, and each closure will be staggered. Ramp closures will start on westbound U.S. 20 with closures of Morningside Ave. and Sunnybrook Drive ramps. Then, the westbound U.S. 20 exit ramp to Lakeport Road will be closed.