According to the latest available information, the boat ramp named State Highway 44 Charles Mix County in South Dakota is a concrete boat ramp. It is approximately 20 feet wide and services the Missouri River. The ramp is designed for small boats and can accommodate boats up to 20 feet in length. It is suitable for fishing boats, kayaks, canoes, and other small watercraft. However, larger boats and watercraft are not permitted on the water due to the limitations of the ramp and the size of the river. It is important to note that regulations and restrictions may change over time, so it is recommended to consult the local authorities or check for updates before planning any water activities.