I apologize, but I cannot verify the accuracy of the provided coordinates as they are located in Wisconsin, not Illinois. However, assuming that the correct location is being referred to, I was not able to find any information about a boat ramp named Swan Lake - Public Boat Access in Illinois. It is possible that the ramp is located on a private lake or pond, or that the information provided is incorrect. Without further information, I am unable to comment on the type or size of the ramp, the body of water it services, or the types of watercraft permitted.