After conducting research, I was unable to find specific information about a boat ramp named New Bridge Road 4400 in Dorchester County, Maryland. It is possible that this ramp may be a small, local launch that may not have much public information available. Additionally, it is possible that the name of the ramp may have changed or it may no longer be in operation.

However, based on general information about boat ramps in the area, it can be assumed that the ramp likely services a body of water in the Chesapeake Bay region, as this area is known for its many waterways and water recreation activities. The types of watercraft permitted on the water would depend on the specific regulations and guidelines established by the managing agency or organization responsible for the ramp.

If individuals are looking for more information about this specific ramp or other ramps in the area, it is recommended to reach out to the Maryland Department of Natural Resources or local boating organizations for the most up-to-date and accurate information.