Unfortunately, there seems to be some confusion in the prompt as the coordinates provided are not for Savannah, Illinois, but for a location in Tennessee. Therefore, it is impossible to provide accurate information about a boat ramp named Wharf Road in Savannah, Illinois.

However, in general, to verify information about a boat ramp, one can consult local government websites or resources, such as the Illinois Department of Natural Resources, to obtain the latest information on the type of boat ramp, its dimensions, the body of water it services, and the types of watercraft permitted on the water. Additionally, contacting local marinas or boating associations may also provide useful information.