After conducting research, I was unable to find any information about a boat ramp named Raddison Lake in Minnesota. It is possible that the name is misspelled, or the ramp may be relatively unknown or privately owned.

In order to provide accurate information, it is important to consult official sources such as the Minnesota Department of Natural Resources (DNR) website or local boating guides. These resources typically provide information about the type of boat ramp, its dimensions, the body of water it services, and the types of watercraft permitted on the water.