California State Route 173
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Map of San Bernardino County in southern California with SR 173 highlighted in red
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| Length: | 24.944 mi (40.143 km) | |||
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| West end: |
 SR 138 in Hesperia
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| East end: |
 SR 18 near Lake Arrowhead
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| Counties: | San Bernardino | |||
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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, United States. 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 northwest of Blue Jay. The route starts at the Mojave River Forks, skims the easterly and southerly sides of Lake Arrowhead and meets State Route 189, Lake's Edge Road, at the south entrance to the Lake Arrowhead mall. The route runs entirely in San Bernardino County, mostly in the San Bernardino National Forest.
Since March 2011, the one-lane unpaved segment of SR 173 has been closed from Hesperia to Lake Arrowhead. Through traffic should use SR 138 and SR 18. An alternate route from Hesperia to Lake Arrowhead would involve heading south on I-15, then east on SR 210 in San Bernardino to reach the southern terminus of SR 18 at Waterman Road.
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