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Based on the available information, the boat ramp named Port Treverton is located in Pennsylvania and has a latitude of 40.70820236 and a longitude of -76.8632431. It is unclear what kind of boat ramp it is or how wide it is as specific details are not available.

However, it can be determined that the boat ramp services the body of water known as the Susquehanna River. The Susquehanna River is a major river located in the northeastern United States, stretching from New York through Pennsylvania and Maryland before emptying into the Chesapeake Bay.

As for what kind of craft are permitted on the water, this is also unclear from the available information. However, it is safe to assume that the boat ramp allows for a variety of watercraft, including motorized boats and possibly kayaks or canoes.

It is important to note that this information may not be up-to-date or accurate as it is based on publicly available information. It is always recommended to verify information with local authorities or the managing agency before using any boat ramp or waterway.