According to the latest information available, the boat ramp named Split Rock Park Road Garretson in South Dakota is a concrete boat ramp. It is approximately 12 feet wide and services the Split Rock Creek, a popular fishing and recreational waterway. The creek is open to non-motorized watercraft such as canoes, kayaks, and paddleboards, as well as small motorized vessels such as fishing boats and pontoon boats. It is important to note that the regulations and permitted watercraft on the Split Rock Creek may change, so it is always advisable to check with local authorities for the latest information before launching any watercraft.