According to the latest information available, the boat ramp named Lyman County is located at latitude 44.17955017 and longitude -99.56829834 in South Dakota. This boat ramp is a concrete-surfaced ramp and is reported to be well-maintained. It is also reported to be wide enough to accommodate two vehicles at the same time, making it convenient for boat owners to launch and retrieve their boats.

The Lyman County boat ramp services the Missouri River, one of the largest and most important rivers in North America. The Missouri River flows through six US states, including South Dakota, and is a popular destination for recreational boating, fishing, and other water activities.

As for the kind of craft permitted on the water at Lyman County, the most recent information suggests that a wide range of watercraft is allowed, including motorized boats, canoes, kayaks, and other non-motorized boats. However, it is always recommended to check with local authorities or signage posted at the ramp for any specific restrictions or regulations that may apply.

Overall, based on the latest information available, the Lyman County boat ramp in South Dakota is an excellent facility for launching and retrieving boats, and it provides easy access to the Missouri River for a variety of watercraft.