Ohio River Paddlefest Ohio River Paddlefest is the nation’s largest paddling celebration, with 2,000 participants traveling through downtown Cincinnati/Northern Kentucky in canoes, kayaks and other human-powered craft while the Ohio River is closed to motorized traffic. Established in 2001, the event benefits Adventure Crew. Registration is required; paddlers can choose between the 9-mile paddle or the 4.5-mile Paddlefest MINI. A limited number of rental boats can be reserved in advance.