the north fork is a tributary of the little cacapon. the north fork's source lies in a hollow between piney mountain and the southwestern end of stony mountain. from its source, the north fork flows northeast along grassy lick road (county route 10). south branch mountain ( high) joins the north fork to its west, and along with stony mountain to its east, the river diverges from grassy lick road and continues its northeastern route to shanks where it meets us route 50. from shanks, the north fork merges with camp run and flows east under us route 50 at frenchburg, where it merges with the south fork to create the little cacapon river.