After conducting research, I could not find any information about a boat ramp named Nowata Drive 597 in Larimer County, Colorado. It is possible that the name has changed or that the ramp no longer exists. Without further information or verification, I cannot accurately provide details about the kind of boat ramp, its width, the body of water it services, or the type of craft permitted on the water. It is important to note that accurate and up-to-date information is crucial when accessing waterways for safety reasons.