Washington State Route 221
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| Route information | ||||
| Auxiliary route of SR 22 | ||||
| Defined by RCW 47.17.425 | ||||
| Maintained by WSDOT | ||||
| Length: | 25.95 mi (41.76 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| North end: |
 SR 22 at Prosser
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| South end: |
 SR 14 at Paterson
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| Location | ||||
| Counties: | Benton | |||
| Highway system | ||||
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State Route 221 (SR 221) is a 25.95-mile (41.76 km) long state highway located entirely within Benton County, Washington, United States. The highway serves to connect the unincorporated community of Paterson to the county seat Prosser. The highway has existed since at least 1926 and was designated as Primary State Highway 8E from 1937 until the 1964 renumbering of Washington state highways.
Washington State Route 221 (SR 221) starts at an intersection with SR 14 in the unincorporated community of Paterson. After leaving Paterson the highway travels north through rural farm land as a two-lane highway. A few minor roads are intersected before the roadway turns to the west after about 17 mi (27 km), before turning back to the north. After the highway resumes its northerly course it climbs into the Horse Heaven Hills, gaining a passing lane through the uphill segments, before finally terminating at SR 22 in south Prosser.
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 average annual daily traffic (AADT), which is a measure of traffic volume for any average day of the year. In 2009, WSDOT calculated that as few as 2,000 cars traveled through the central part of the highway, and as many as 2,500 cars at the interchange with SR 22.
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