The Ridge Route was officially the Castaic–Tejon Route. The official limits of the Ridge Route, as built in the 1910s, were SR 126 at Castaic Junction and the bottom of the grade at Grapevine. Until 1930 the road from San Fernando to Castaic Junction ran through the Newhall Tunnel at San Fernando Pass and along San Fernando Road, Magic Mountain Parkway (both part of SR 126 until the early 2000s) and Feedmill Road to a former bridge over the Santa Clara River. A 1930 bypass of the tunnel and Newhall through Weldon Canyon is now part of The Old Road.