After conducting research, I was not able to find any specific information about the Capt Roberts Boating Site in California. Therefore, I am unable to provide details regarding the kind of boat ramp it is, its width, the body of water it services, and the kind of craft allowed on the water. Without further information, it's difficult to determine the accuracy of the coordinates provided. It is possible that the boat ramp has been renamed or is not a well-known location.