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After conducting research, it appears that the boat ramp named Speedwell Forge Lake in Pennsylvania may not be usable currently. The latest information available suggests that there is a dam rehabilitation project underway that has closed the lake to recreation until further notice.

Assuming the boat ramp was usable prior to the closure, it is likely that it services Speedwell Forge Lake, which is a 120-acre lake located in Lancaster County, Pennsylvania. The lake is known for its fishing and recreational opportunities, offering opportunities for boating, kayaking, and paddleboarding.

Unfortunately, specific details about the boat ramp's width and the types of craft permitted on the water are not readily available. However, it is safe to assume that the ramp would have been designed to accommodate a range of watercraft, including boats small and large. Additionally, it is likely that the ramp would be wide enough to allow for safe launching and retrieval of boats, though the exact measurements are uncertain.

Overall, while the Speedwell Forge Lake boat ramp may be currently unusable, it remains an important part of the recreational infrastructure in Lancaster County. Visitors to the area should keep an eye out for updates on the status of the dam rehabilitation project and any changes to access to the lake and its amenities.