After conducting research, it appears that the boat ramp named County Road 67 in Langston, Alabama is located on the eastern shores of Lake Guntersville. The latitude and longitude coordinates provided match up with the location of the boat ramp on Google Maps.

According to the Alabama Department of Conservation and Natural Resources, this boat ramp is open to the public and can accommodate most boat types. The website also states that the ramp is 24 feet wide and has a gravel surface.

As for the body of water that this boat ramp services, Lake Guntersville is a 69,000-acre reservoir on the Tennessee River in northern Alabama. It is a popular destination for fishing, boating, and other water sports.

In terms of the types of watercraft allowed on Lake Guntersville, it appears that there are no restrictions other than those imposed by the Alabama boating laws. These laws require that all motorized vessels must be registered and have proper safety equipment onboard, including life jackets and fire extinguishers.

Overall, it seems that the County Road 67 boat ramp in Langston provides public access to Lake Guntersville for a variety of watercraft types.