Based on the latest available information, the Black Rock Flats Boat Launch is a public boat ramp located in Pennsylvania. The coordinates provided (latitude: 39.77471924, longitude: -76.93477631) confirm its location in Pennsylvania, specifically in the Susquehanna River.

The boat ramp at Black Rock Flats Boat Launch appears to be a standard concrete ramp that is suitable for launching and retrieving boats. The ramp is wide enough to accommodate a variety of watercraft, including larger boats and trailers. However, the exact width of the ramp is not specified in the available information.

The Black Rock Flats Boat Launch services the Susquehanna River, which is a large, navigable river that flows through several states in the northeastern United States. This part of the river is quite calm and relatively shallow, making it ideal for boating and fishing. The Susquehanna River is also known for its scenic beauty and its many recreational opportunities.

As for the types of craft that are permitted on the water, the information available suggests that the Black Rock Flats Boat Launch is open to a wide variety of boats and watercraft. This may include fishing boats, pleasure boats, kayaks, canoes, and other small watercraft. However, it is important to note that some restrictions may apply, depending on local regulations and conditions. It is always a good idea to check with local authorities or the ramp operator for specific information about boat types and other restrictions.