Based on the available information, the Lower Lake boat ramp is located in New York and has a latitude of 40.83387756 and a longitude of -72.91706085. This boat ramp provides access to the Lower Lake, which is a popular fishing and recreational area in the region.

The exact dimensions of the boat ramp are not available, but it is known to be wide enough to accommodate a range of watercraft, from small fishing boats to larger recreational vessels. Additionally, the ramp is well-maintained and easily accessible, making it a popular spot for both locals and tourists.

As for the types of watercraft that are permitted on the Lower Lake, this information is also not readily available. However, it is likely that the lake permits a variety of boats, including kayaks, canoes, fishing boats, and larger recreational boats. There may also be regulations in place regarding the use of motorized boats, speed limits, and other safety measures.

To verify this information and obtain more details about the Lower Lake boat ramp and the surrounding area, interested individuals can consult with local boating authorities, check online resources, or visit the site in person.