Washington State Route 8
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SR 8 highlighted in red.
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| Route information | ||||
| Defined by RCW 47.17.035 | ||||
| Maintained by WSDOT | ||||
| Length: | 20.67 mi (33.27 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| West end: |
 US 12 in Elma
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 SR 108 in McCleary
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| East end: |
 US 101 near Olympia
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| Location | ||||
| Counties: | Grays Harbor, Thurston | |||
| Highway system | ||||
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State Route 8 (SR 8) is a state highway in Grays Harbor and Thurston counties, of the U.S. state of Washington. It extends 20.67 miles (33.27 km) from U.S. Route 12 (US 12) in the city of Elma, east to an interchange with US 101 about 5.90 miles (9.50 km) northwest of the state capital, Olympia. SR 8 intersects SR 108 west of McCleary. The route connects Elma and Olympia as part of a corridor between Aberdeen and the Puget Sound region.
The highway was part of the Elma – Grand Mound branch of Primary State Highway 9 (PSH 9 EG) from 1937 until 1964, which ran from Elma southeast to Interstate 5 (I-5), formerly US 99 in Grand Mound, which was later added as part of US 12 in 1967. The road also forms the northern boundary of Capitol State Forest in Thurston County.
SR 8 runs 20.67 miles (33.27 km) east from US 12 in Elma to an interchange with US 101 5.90 miles (9.50 km) northwest of Olympia. The route links the city of Elma with Olympia, and intersects only one other highway, SR 108, in McCleary. WSDOT has found that more than 17,000 motorists utilize the road daily at the interchange with US 101 based on average annual daily traffic (AADT) data.
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