Washington State Route 181
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| Valley Highway | ||||
SR 181 is highlighted in red.
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| Route information | ||||
| Defined by RCW 47.17.370 | ||||
| Maintained by WSDOT | ||||
| Length: | 6.05 mi (9.74 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| South end: |
 SR 516 in Kent
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| North end: |
 I‑405 in Tukwila
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| Location | ||||
| Counties: | King | |||
| Highway system | ||||
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State Route 181 (SR 181, named the Valley Highway) is a 6.05-mile-long (9.74 km) state highway serving King County in the U.S. state of Washington. The highway, travelling north parallel to the Green River, begins at SR 516 in Kent and ends at an interchange with Interstate 405 (I-405) in Tukwila. The highway primarily serves as an alternate route to the SR 167 freeway, which travels east parallel to SR 181.
The original route, between Auburn and Rainier Valley in Seattle, was originally established in 1931 as a branch of Primary State Highway 1 (PSH 1) and in 1937 as Secondary State Highway 5M (SSH 5M). SSH 5M was renumbered to SSH 2M in 1969 and became SR 181 after the 1964 highway renumbering. SR 181 was shortened twice in the 1970s from Seattle to Tukwila and once more in 1991 from Auburn to Kent to form its present route, no longer connected to parent route SR 18.
SR 181 begins as the Valley Highway at an intersection with SR 516 west of Downtown Kent and an interchange between SR 516 and SR 167. The highway travels north and parallels the Green River and a pedestrian and bicycle trail to the west and the Interurban Trail to the east into Tukwila. SR 181 begins to parallel a BNSF and Union Pacific rail line to the east as it serves Tukwila Station. The highway ends at a partial cloverleaf interchange with I-405, crossing over the Green River shortly before its northern terminus.
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