CA 173 Travel Info
2025-10-25
Roadnow
State Route 173 (SR 173) runs from State Route 138 near the west end of Silverwood Lake in the Summit Valley south of Hesperia to State Route 18 south of Lake Arrowhead, USA. It is the only California state highway with an unpaved segment, which is a one-lane jeep trail on the Northwestern face of the San Bernardino Mountains directly east of Summit Valley and northwe ... more
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