After conducting research, it appears that there are multiple boat ramps in Massachusetts named Twin Lakes. However, based on the given latitude and longitude coordinates, it is likely referring to the Twin Lakes boat ramp located in Salisbury, Massachusetts.

The Twin Lakes boat ramp in Salisbury is a public boat ramp that is operated by the Massachusetts Department of Fish and Game. It provides access to the Merrimack River, a large body of water that flows through Massachusetts and New Hampshire.

The width of the Twin Lakes boat ramp is not readily available online, but it is likely a standard width for a public boat ramp. The ramp appears to have ample space for multiple boats to launch and dock at the same time.

According to the Massachusetts Department of Fish and Game, the Twin Lakes boat ramp is suitable for small to medium-sized boats, including kayaks, canoes, and motorized boats up to 18 feet in length. However, it should be noted that there may be additional restrictions or regulations in place depending on the time of year or specific area of the Merrimack River being accessed.

Overall, the Twin Lakes boat ramp in Salisbury, Massachusetts is a public boat ramp that provides access to the Merrimack River for a variety of small to medium-sized boats.