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Washington State Route 18 information


State Route 18 marker

State Route 18

Map
SR 18 highlighted in red
Route information
Maintained by WSDOT
Length28.41 mi[1] (45.72 km)
Existed1964[2]–present
Major junctions
West endWashington State Route 18 SR 99 in Federal Way
Major intersectionsWashington State Route 18 SR 161 in Federal Way
Washington State Route 18 I-5 in Federal Way
Washington State Route 18 SR 167 in Auburn
Washington State Route 18 SR 164 in Auburn
Washington State Route 18 SR 516 in Covington
Washington State Route 18 SR 169 in Maple Valley
East endWashington State Route 18 I-90 near North Bend
Location
CountryUnited States
StateWashington
CountyKing
Highway system
  • State highways in Washington
  • Interstate
  • US
  • State
  • Scenic
  • Pre-1964
  • 1964 renumbering
  • Former
← Washington State Route 18 SR 17→ Washington State Route 18 SR 19

State Route 18 (SR 18) is a 28.41-mile-long (45.72 km) state highway in the U.S. state of Washington, serving southeastern King County. The highway travels northeast, primarily as a controlled-access freeway, from an intersection with SR 99 and an interchange with Interstate 5 (I-5) in Federal Way through the cities of Auburn, Kent, Covington, and Maple Valley. SR 18 becomes a two-lane rural highway near Tiger Mountain as it approaches its eastern terminus, an interchange with I-90 near the cities of Snoqualmie and North Bend.

SR 18 was established during the 1964 state highway renumbering as the successor to the Auburn–Federal Way branch of Primary State Highway 5 (PSH 5) and the Auburn–North Bend branch of PSH 2, which were created in 1931 and 1949, respectively. The initial two-lane highway, named the Echo Lake Cutoff, was completed in December 1964 after the opening of a section around Tiger Mountain, which would later be the site of over 170 accidents in the 1980s. SR 18 was gradually widened into a four-lane freeway beginning in Auburn in 1992 and most recently finishing in Federal Way in 2007. The highway around Tiger Mountain and near the I-90 interchange remains a two-lane road, with a funded project planned to re-build the existing interchange with I-90.

  1. ^ Staff (2012). "State Highway Log: Planning Report 2012, SR 2 to SR 971" (PDF). Washington State Department of Transportation. pp. 505–515. Retrieved April 4, 2013.
  2. ^ "47.17.075: State route No. 18". Revised Code of Washington. Washington State Legislature. 1970–1987. Retrieved April 4, 2013.

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