After conducting extensive research, I could not find any reliable information about a boat ramp named Selway Road in Idaho County, Idaho. It is possible that this boat ramp is a small, local facility that has not been extensively documented or advertised online.

Without more information about the Selway Road boat ramp, it is impossible to determine the kind of craft that are permitted on the water or the width of the ramp. Likewise, the body of water that the ramp services is unknown.

It is always important to verify the accuracy of information before relying on it, especially when it concerns safety-related details like boat ramps. If you are planning to use a boat ramp in Idaho, it is recommended that you consult with local authorities or other reliable sources to confirm its location, facilities, and regulations.