After conducting research, I was not able to find any specific information about a boat ramp named US 9 Round Lake in New York. It is possible that the information provided in the question is incorrect or outdated.

In general, boat ramps can vary in size and capacity, and may be designed for different types of watercraft. Some boat ramps may be located on rivers, lakes, or other bodies of water, and may be restricted to certain types of boats or activities.

To provide accurate information about a specific boat ramp, it is important to consult reliable sources such as official government or park websites, local boating associations, or other reputable organizations. Without such information, it is difficult to provide a detailed description of a particular boat ramp and the services it provides.