After conducting research, I was unable to find any reliable information on a boat ramp named Chestnut Road 291 in Cumberland County, New Jersey with the given latitude and longitude coordinates. It is possible that the location name or coordinates may be incorrect or outdated.

Without accurate information, it is impossible to determine the type of boat ramp, width, body of water it services, and permitted watercraft. To provide accurate details, it is important to have current and reliable information sources. It is recommended to verify the location name and coordinates and consult official state or local resources for information on boat ramps and water access points in New Jersey.