The City of Flagstaff is closing Switzer Canyon Drive for 24 hours starting Monday, to complete paving of the roundabout at Turquoise Drive. Officials say the intersection of Switzer Canyon, Turquoise and Canyon Terrace drives will be closed from 6 p.m. Monday to 6 p.m. Tuesday. There will be no through traffic at the intersection during this time. Officials say it is the last anticipated closure for the project. Traffic detours are posted in the area.