IOWA CITY, Iowa - Due to rising lake levels, the U.S. Army Corps of Engineers at Coralville Lake are closing several recreational areas starting September 4. Closed areas will include the Curtis Bridge Boat Ramp, the boat ramp and swim beach at Sandy Beach Day Use Area, campsites 170-181 and 194-208 and the beaches and boat ramp at the Sugar Bottom Recreation Area. Due to water over the roadway, 140th Street between Ely Road and the Sandy Beach Day Use Area will also be impassible.