County Line Road within Henry W. Coe State Park and Orestimba Wilderness is used as a hiking, biking, and horse trail.
[1] What became the County Line Road was originally a trail, used by Native Americans to travel along the divide of the Diablo Range.
It was later used by Californio and other mesteñeros from the early 1840s to drive Alta California horses to Sonora for sale and was known as La Vereda del Monte.
The gang of Joaquin Murrieta used the trail in the early 1850s to drive stolen horses and mustangs to their base at the Arroyo de Cantua.
Droves of wild horses were held at Mustang Flat and Paradise Flat and driven up along route of the Long Ridge Road to Mustang Peak to be joined to the drove moving southward along La Vereda from Valle Atrevesado or Valle Hondo.