Washington State Route 170
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SR 170 is highlighted in red.
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| Route information | ||||
| Auxiliary route of SR 17 | ||||
| Defined by RCW 47.17.345 | ||||
| Maintained by WSDOT | ||||
| Length: | 3.68 mi (5.92 km) | |||
| Existed: | 1970 – present | |||
| Major junctions | ||||
| West end: |
 SR 17 near Warden
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| East end: | South Main Street in Warden | |||
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State Route 170 (SR 170) is a short, 3.68-mile (5.92 km) long state highway located within Grant County in the U.S. state of Washington. The highway begins at SR 17 west of Warden and travels east to end at Main Street in Warden. The current route of the highway was first established in 1967 as Secondary State Highway 11I (SSH 11I) and became SR 170 in 1970 after it was moved north of its previous route, which had been on maps since 1926, named SSH 11A in 1937 and renumbered to SR 170 in 1964. The old route ran from the Columbia River southwest of Basin City to SR 17 north of Mesa.
State Route 170 (SR 170) begins at SR 17 west of Warden and south of the SR 17 and SR 262 intersection. From SR 17, the highway travels east to cross two pairs of railroad tracks owned by Columbia Basin Railroad, which go south to Connell and north to Moses Lake, to enter Warden. Once the roadway enters Warden, it is named 1st Street and later ends at Main Street. The busiest segment of the road in terms of vehicle counts was between SR 17 and Warden, with a daily average of 2,800 motorists in 2007; the busiest segment in 1970 was at Main Street, with a daily average of 2,100 motorists.
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