Based on the information available, the Renfro Road 2637 boat ramp in Jefferson City, Tennessee is a concrete boat ramp that provides access to Cherokee Lake. The width of the boat ramp is not specified. Cherokee Lake is a reservoir located in the eastern part of the state, covering an area of approximately 30,300 acres. It is a popular destination for boating, fishing, and other recreational activities. The lake is open to all types of boats, including kayaks, canoes, sailboats, and powerboats. However, it is important to note that certain rules and regulations may apply, such as speed limits and no-wake zones. It is recommended to check with local authorities for the latest information on boating regulations and safety guidelines.