Lake Powell AZ Sedona AZ (July 30, 2016) – On Saturday, August 13, 2016, law enforcement agencies in northern Coconino County will be conducting an Operating Under the Influence (OUI) and boating safety checkpoint at Lake Powell from 3:00 p.m. to 7:00 p.m. In an effort to reduce the number of persons killed and injured in alcohol and drug involved boat collisions, OUI checkpoints are conducted...