Based on the information available, the boat ramp named South Washington Street Herkimer is located at latitude 43.01853943 and longitude -74.97827148 in New York. It is a public boat ramp that provides boat access to the Mohawk River.

The ramp is reported to be wide enough to accommodate trailers of various sizes, making it easy for boats of different lengths to launch and dock. The latest information available does not provide an exact measurement of the ramp's width.

The Mohawk River, which is serviced by the South Washington Street Herkimer boat ramp, is a 149-mile-long river that flows through the state of New York. The river is known for its scenic beauty and is a popular destination for recreational boating, fishing, and other water-based activities.

As for the types of craft that are permitted on the water, the latest information available from the New York State Department of Environmental Conservation (DEC) website indicates that motorized boats, canoes, and kayaks are permitted on the Mohawk River. However, there may be certain restrictions and regulations in place based on the location and time of year.

In summary, the South Washington Street Herkimer boat ramp is a public boat ramp that provides access to the Mohawk River in New York. The ramp is wide enough to accommodate various sizes of trailers, and motorized boats, canoes, and kayaks are permitted on the water.