Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. State Route 79 (abbreviated SR 79) is a 10.37-mile (16.69 km) long state highway in southwestern Lake County, Tennessee. SR 79 has a dual primary & secondary designation and is one of a few state routes in Tennessee to have an aggregate road surface.The western terminus of SR 79 is located at the Mississippi River (Island 15) in the extreme southwestern portion of Lake County, Tennessee and travels across low-lying areas that are subject to flooding from the Mississippi River.