{{Short description|State highway in Lewis County, Washington, US}} {{Use American English|date=May 2025}} {{Use mdy dates|date=January 2025}} {{Infobox road |state=WA |type=SR |route=122 |alternate_name= |spur_type=US |spur_of=12 |section=227 |map=Washington State Route 122.svg |map_notes=SR&nbsp;122 highlighted in red |length_mi=7.88 |length_round=2 |length_ref=<ref name="log">{{WSDOT State Highway Log |year=2011 |pages=1037–1038 |link=yes |accessdate=January 30, 2013}}</ref> |established=1991<ref name="RCW">{{cite web |url=http://apps.leg.wa.gov/RCW/default.aspx?cite=47.17.227 |title=47.17.227: State route No. 122 |year=1991 |work=Revised Code of Washington |publisher=Washington State Legislature |accessdate=January 30, 2013}}</ref> |direction_a=West |terminus_a={{jct|state=WA|US|12}} in Silver Creek |direction_b=East |terminus_b={{jct|state=WA|US|12}} in Mossyrock |counties=Lewis |previous_type=SR |previous_route=121 |next_type=SR |next_route=123 }}

'''State Route&nbsp;122''' ('''SR&nbsp;122''') is a {{convert|7.88|mi|km|adj=mid|-long}} state highway on the north shore of Lake Mayfield in rural Lewis County, located within the U.S. state of Washington. The highway begins at U.S. Route&nbsp;12 (US&nbsp;12) in Silver Creek and travels east through Ike Kinswa State Park before turning south over the Cowlitz River to Mossyrock, ending at US&nbsp;12. SR&nbsp;122 was established in 1991 on roads built in the 1910s and 1940s and the designation was transferred from SR&nbsp;142.

==Route description== thumb|left|SR&nbsp;122 near its eastern terminus in Mossyrock

SR&nbsp;122 begins as Silver Creek Road at an intersection with US&nbsp;12 in the unincorporated community of Silver Creek in rural Lewis County. The highway travels northeast over Silver Creek towards Lake Mayfield, becoming Harmony Road. SR&nbsp;122 continues east along the north shore of the lake and crosses the Tilton River before passing through Ike Kinswa State Park. The highway continues east to Harmony, where it turns south to cross the Cowlitz River, eventually ending at an intersection with US&nbsp;12 north of Mossyrock.<ref name="google">{{google maps |title=State Route 122 |url=https://maps.google.com/maps?saddr=US-12+E&daddr=46.5449317,-122.5618084+to:US-12+E&hl=en&ll=46.542451,-122.540474&spn=0.066947,0.169086&sll=46.534215,-122.485789&sspn=0.004185,0.010568&geocode=FYfrxQIdIVex-A%3BFSM4xgId8Nqx-CkBI5hLWFKRVDHZp--hi2ySDA%3BFYQOxgIdgAWz-A&mra=me&mrsp=1,0&sz=17&t=m&z=13&via=1 |accessdate=January 2, 2011}}</ref>

Every year, the Washington State Department of Transportation (WSDOT) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of annual average daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2011, WSDOT calculated that between 850 and 1,100 vehicles per day used the highway, mostly at the US&nbsp;12 intersection in Mossyrock.<ref name="ATR">{{cite web |author=Staff |year=2011 |title=2011 Annual Traffic Report |page=140 |publisher=Washington State Department of Transportation |url=http://www.wsdot.wa.gov/mapsdata/travel/pdf/Annual_Traffic_Report_2011.pdf |accessdate=January 30, 2013 |archive-date=June 13, 2013 |archive-url=https://web.archive.org/web/20130613043942/http://www.wsdot.wa.gov/mapsdata/travel/pdf/Annual_Traffic_Report_2011.pdf |url-status=dead }}</ref>

==History==

SR&nbsp;122 between Silver Creek and Harmony follows the route of an unpaved road built in the 1910s and removed after the completion of the Mayfield Dam in 1963,<ref name="usgs-1916">{{cite map |publisher=United States Geological Survey |title=Washington: Chehalis Quadrangle |year=1916 |url=http://www.lib.utexas.edu/maps/topo/washington/txu-pclmaps-topo-wa-chehalis-1914.jpg |scale=1:125,000 |format=JPG |accessdate=January 30, 2013}}</ref><ref name="dam">{{cite web |title=Cowlitz River Project - Statistics |url=http://www.mytpu.org/tacomapower/power-system/hydro-power/cowlitz-river-project/statistics.htm |publisher=Tacoma Public Utilities |accessdate=January 30, 2013}}</ref> while the road from Harmony to Mossyrock was built in the 1940s.<ref name="usgs-1951">{{cite map |publisher=United States Geological Survey |title=Hoquiam, 1951 |year=1951 |url=http://www.lib.utexas.edu/maps/topo/250k/txu-pclmaps-topo-us-hoquiam-1951.jpg |scale=1:250,000 |format=JPG |accessdate=January 30, 2013}}</ref> The roadway was later reconstructed and designated in 1991 as SR&nbsp;122, a number previously used on the route of SR&nbsp;142 until 1967.<ref name="RCW"/>

==Major intersections== {{WAinttop|county=Lewis|length_ref=<ref name="log"/>}} {{WAint |location=Silver Creek |mile=0.00 |road={{jct|state=WA|US|12|city1=Salkum|city2=Mossyrock}} |notes=Western terminus }} {{WAint |location=Mossyrock |mile=7.88 |road={{jct|state=WA|US|12|city1=Salkum|city2=Morton}} |notes=Eastern terminus, continues as Williams Street }} {{Jctbtm}}

==References== {{reflist}}

==External links== {{AttachedKML|display=title,inline}}

*[https://www.angelfire.com/wa2/hwysofwastate/sr122.html Highways of Washington State]

{{State highways in Washington related to US 12}}

122 Category:Transportation in Lewis County, Washington