How long is the river in which Fort Watuaga stood on the shores of?
Fort Watauga: Fort Watauga, more properly Fort Caswell, was an American Revolutionary War fort that once stood at the Sycamore Shoals of the Watauga River in what is now Elizabethton, Tennessee. Watauga River:  It is 78.5 mi long with its headwaters on the slopes of Grandfather Mountain and Peak Mountain in Watauga County, North Carolina.
78.5