Template:Routeboxca2 California State Route 173 runs from Route 138 near Hesperia to Route 18 near Lake Arrowhead, USA. It is the only unpaved state highway in California. The route skims around Lake Arrowhead, meeting Route 189 at the south side. The route runs entirely in San Bernadino County, California.
History
Before 1964, Route 173 was part of Signed Route 2.
State Law
Legal Definition of Route 173: California Streets and Highways Code, Chapter 2, Article 3, Section 473 Template:CAScenic