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{{short description|Highway in California}}
{{Use American English|date=March 2025}}
{{Use mdy dates|date=January 2025}}
{{Infobox road
|state=CA
|type=SR
|route=173
|map_notes=Map of San Bernardino County in southern California with SR 173 highlighted in red
|section=473
|maint=[[Caltrans]]
|length_mi=24.944
|length_round=3
|length_ref=<ref name=trucklist/>
|direction_a=West
|terminus_a={{jct|state=CA|SR|138}} in [[Hesperia, California|Hesperia]]
|direction_b=East
|terminus_b={{jct|state=CA|SR|18}} near [[Lake Arrowhead, California|Lake Arrowhead]]
|restrictions=The one-lane, unpaved segment between the [[Pacific Crest Trail]] and a point northeast of [[Lake Arrowhead Reservoir|Lake Arrowhead]] is closed indefinitely
|counties=[[San Bernardino County, California|San Bernardino]]
|previous_type=SR
|previous_route=172
|next_type=SR
|next_route=174
}}
'''State Route 173''' ('''SR 173''') is a [[state highway]] in the [[U.S. state]] of [[California]] that runs entirely in [[San Bernardino County, California|San Bernardino County]], mostly in the [[San Bernardino National Forest]]. Its west end is at [[State Route 138 (California)|State Route 138]] near the west end of [[Silverwood Lake]] in the [[Summit Valley (San Bernardino County, California)|Summit Valley]] south of [[Hesperia, California|Hesperia]]. Its east end is at [[State Route 18 (California)|State Route 18]] south of [[Lake Arrowhead, California|Lake Arrowhead]]. The route starts at the Mojave River Forks, skims the easterly and southerly sides of Lake Arrowhead and meets [[State Route 189 (California)|State Route 189]], Lake's Edge Road, at the south entrance to the Lake Arrowhead Village.
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 (San Bernardino County, California)|Summit Valley]] and northwest of [[Blue Jay, California|Blue Jay]]. Since March 2011, this one-lane unpaved segment of SR 173 has been closed.<ref name="2011 closure"/> Through traffic should use [[California State Route 138|SR 138]] and [[California State Route 18|SR 18]]. An alternate route from Hesperia to Lake Arrowhead would involve heading south on [[Interstate 15|I-15]], then south on [[Interstate 215 in California|I-215]], then east on [[California State Route 210|SR 210]] in [[San Bernardino, California|San Bernardino]] to reach the southern terminus of SR 18 at Waterman Road.
==Route description==
SR 173 begins at [[SR 138 (CA)|SR 138]] just inside the [[Hesperia, California|Hesperia]] city limits and travels east near the shore of [[Silverwood Lake]], passing near [[Cedar Springs Dam]], several houses and ranches, and the historic Las Flores Ranch site. The road briefly turns north further into the Hesperia city limits, leaving the [[San Bernardino National Forest]]. SR 173 leaves the city and enters [[Mojave River Forks Regional Park]], where it turns east and intersects Arrowhead Lake Road, which leads to the urban center of Hesperia. Once SR 173 intersects the [[Pacific Crest National Scenic Trail]], it turns into a one-lane dirt road rising along the north face of the San Bernardino Mountains, first heading east to its apex before turning south to the [[Lake Arrowhead, California|Lake Arrowhead]] area. This one-lane dirt segment has been closed to traffic since March 2011.<ref name="2011 closure"/> The paved segment of SR 173 resumes northeast of Lake Arrowhead and enters the community of [[Cedar Glen, California|Cedar Glen]], where it parallels the [[Lake Arrowhead Reservoir|Lake Arrowhead]] shoreline and encounters Papoose Lake. The highway enters the community of Lake Arrowhead, where SR 173 intersects [[SR 189 (CA)|SR 189]] and turns south to terminate at [[SR 18 (CA)|SR 18]].<ref name="sbdtg">{{cite map|year=2008|title=San Bernardino County Road Atlas|publisher=Thomas Brothers}}</ref>
SR 173 is not part of the [[National Highway System (United States)|National Highway System]],<ref name=fhwa-nhs>{{FHWA NHS map|region=californiasouth|accessdate=}}</ref> a network of highways that are considered essential to the country's economy, defense, and mobility by the [[Federal Highway Administration]].<ref name=NHS-FHWA>{{FHWA NHS}}</ref> SR 173 is eligible for inclusion in the [[State Scenic Highway System (California)|State Scenic Highway System]],<ref name="scenic">{{CA scenic}}</ref> but it is not officially designated as a scenic highway by the [[California Department of Transportation]].<ref name="caltransscenic">{{Caltrans scenic|accessdate=September 17, 2017}}</ref>
==History==
[[File:California State Route 173 - Eastern Barrier.jpg|thumb|The barrier at the eastern end of the closed unpaved segment of SR 173]]
[[File:California State Route 173 - Pavement Ends.jpg|thumb|The eastern point along SR 173 where the pavement ends and the unpaved segment heads west]]
[[File:173 sbd7.77 east.png|thumb|The western barrier along SR 173 where the closed unpaved segment begins and heads east]]
Before 1964, Route 173 was part of California Legislative Route 59; however, like a small number of other California State highways, it was not signed. From 1934 to the mid-1950s the part of Route 59 that is now Route 173 was designated by the California Division of Highways to be a segment of California sign route 2; however, signing did not occur. From the mid-1950s through July 1964, the Division of Highways changed the routing of future sign route 2 from the subject segment of Route 59 to Legislative Route 188, the segment of present [[State Route 138 (California)|California 138]] between the junction of Routes 138 and 173 and Mount Anderson Junction, the junction of Routes 18 and 138 south of [[Crestline, California|Crestline]].
The highway has faced repeated problems since the 2003 Willow Fire that has made the one-lane unpaved trail portion (approximately between Postmile 7.5 and Postmile 11.5) unsafe for passage from erosion and storm damage. Since March 2011, the one-lane trail portion of SR 173 has been permanently closed to through traffic.<ref name="2011 closure">{{cite web|title=State Route 173 (Unpaved Portion) Permanent Closure|url=http://sv08data.dot.ca.gov/memos/files/comalert/021511.pdf|publisher=CalTrans District 8|access-date=18 December 2012}}</ref> While roadway preservation maintenance (basic grading, debris clearance) is still done, this decision effectively ends all further interest to upgrade the segment to a 2-lane passable highway through state-funded projects.
{{Clear}}
==Major intersections==
{{CAinttop|county=San Bernardino|post_ref=<br/><ref name=trucklist /><ref name=bridgelog>{{Caltrans bridgelog|date=July 2007}}</ref><ref>[[California Department of Transportation]], [http://traffic-counts.dot.ca.gov/ All Traffic Volumes on CSHS], 2005 and 2006</ref>
}}
{{CAint
|___location=Hesperia
|postmile=L0.00
|road={{Jct|state=CA|SR|138|to2=to|I|15|city1=Silverwood Lake|city2=Crestline}}
|notes=West end of SR 173
}}
{{CAint
|___location=none
|postmile=L6.99
|road=Arrowhead Lake Road – [[Hesperia, California|Hesperia]]
|notes=
}}
{{jctplace
|state=CA
|type=closed
|___location=none
|postmile=L7.75
|postmile2=10.90
|place=One-lane, unpaved segment, closed
}}
{{CAint
|___location=Lake Arrowhead
|postmile=21.46
|road={{jct|state=CA|SR|189|city1=Blue Jay|road|Village Road}}
|notes=Eastern terminus of SR 189
}}
{{CAint
|___location=none
|postmile=23.04
|road={{Jct|state=CA|SR|18|city1=Running Springs|city2=Big Bear Lake|city3=San Bernardino}}
|notes=East end of SR 173
}}
{{Jctbtm|keys=closed}}
==See also==
*{{portal-inline|California Roads}}
==References==
{{Reflist|30em}}
==External links==
{{Attached KML|display=inline,title}}
{{commons category}}
{{CASR external links|SR|173}}
*[http://www.aaroads.com/california/ca-173.html California @ AARoads - State Route 173]
*[http://www.cahighways.org/169-176.html#173 California Highways: SR 173]
[[Category:
[[Category:Roads in San Bernardino County, California|State Route 173]]
[[Category:San Bernardino Mountains]]
[[Category:Hesperia, California]]
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