Based on the latest information available, the boat ramp named State Park Drive Lake County in South Dakota is a concrete boat ramp that is approximately 20 feet wide. It services Lake Madison, which is a popular recreational lake located in Lake County, South Dakota. This boat ramp is designed for small to medium-sized watercraft, including motorboats, sailboats, and fishing boats. The lake is primarily used for boating, fishing, and swimming, and is known for its clear water and sandy beaches. It is important to note that the rules and regulations for watercraft use on Lake Madison can change, so it is always important to consult the latest information from the South Dakota Game, Fish & Parks department before using this boat ramp or operating any watercraft on the lake.