Petty Officer 1st Class Davis Olsgard of Coast Guard Station Port Huron, Mich., pilots a response boat through crowds of people during the unsanctioned marine event known as the Port Huron Float Down, during which more than a thousand people gathered Aug. 16, 2015, to float 7.5 miles down the St. Clair River between Port Huron, Mich., and Marysville, Mich., on the border of the U.S. and Canada in inflatable and makeshift rafts. The event has no official organizer and poses significant and unusual hazards given the fast-moving current, large number of participants, lack of life jackets, alcohol consumption, potentially challenging weather conditions, water temperature, and limited rescue resources. (U.S. Coast Guard photo by Chief Petty Officer Lauren Jorgensen)