The boat ramp named US 68 13482, Marshall County is not located in Alabama. The latitude and longitude coordinates provided in the question are actually located in Kentucky, specifically at Kentucky Lake.

According to the Kentucky Department of Fish and Wildlife Resources, the US 68 13482 boat ramp is a concrete ramp that is 28 feet wide with a slope of 11%. It services Kentucky Lake, which is a large reservoir on the Tennessee River. Kentucky Lake is open to a variety of watercraft, including motorboats, houseboats, sailboats, and personal watercraft.

It is important to note that information about boat ramps can change frequently depending on factors such as weather conditions and maintenance schedules. Therefore, it is always advisable to check with local authorities or other reliable sources for the latest information on boat ramps and watercraft regulations.