 The southern route provided access to the top of the mountain, while the northern portion was only accessible by a long-closed wagon road built in the 1950s.A projected highway was planned to replace the wagon road, but the project was canceled in 1982 when the area around it was designated a wilderness area.When the southern completion of SR 66 was canceled, SR 180 was extended along the connecting part and the remainder became SR 180 Spur.