Based on available information, the boat ramp named State Route 74 Shoreham is located in the town of Shoreham, in the state of New York. It is a public boat ramp that provides access to Lake Champlain, a large freshwater lake situated on the border between the United States and Canada.

The boat ramp is reported to be relatively wide, with enough space to accommodate multiple vehicles and boats at the same time. Some sources indicate that the ramp is approximately 16 feet wide, which should be sufficient for most types of watercraft, including larger boats and jet skis.

In terms of permitted craft, Lake Champlain is a popular destination for a variety of water-based activities, including fishing, boating, and water sports. As such, it is likely that the boat ramp at State Route 74 Shoreham is open to a wide range of vessels, from small fishing boats and kayaks to larger power boats and sailboats. However, it is always best to check the latest regulations and restrictions before launching any watercraft from this or any other public boat ramp.