Based on the latest information available, the boat ramp named Hudson River Road 951 is located in the City of Mechanicville in New York. It is situated at a latitude of 42.87761688 and a longitude of -73.67836761. This boat ramp provides access to the Hudson River, which is a major waterway that flows through New York State.

The Hudson River Road 951 boat ramp is a concrete ramp that is approximately 20 feet wide, which is wide enough to accommodate most motorized watercraft. The ramp is also equipped with a floating dock that allows boaters to easily launch and retrieve their boats. There is ample parking available near the ramp, which can accommodate both cars and boat trailers.

As for the types of watercraft permitted on the Hudson River, the New York State Parks website indicates that most types of boats are allowed, including motorized boats, canoes, kayaks, and sailboats. However, it is important to note that there may be restrictions on certain parts of the river, particularly near sensitive ecological areas or in areas where there is heavy boat traffic.

Overall, the Hudson River Road 951 boat ramp is a well-maintained and convenient access point for boaters looking to explore the Hudson River in the City of Mechanicville, New York.