Washington State Route 243
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SR 243 highlighted in red.
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| Route information | ||||
| Auxiliary route of SR 24 | ||||
| Defined by RCW 47.17.465 | ||||
| Maintained by WSDOT | ||||
| Length | 28.26 mi (45.48 km) | |||
| Existed | 1964 – present | |||
| Major junctions | ||||
| South end |
 SR 24 near Desert Aire
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| East end |
 SR 26 near Vantage
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| Highway system | ||||
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State Route 243 (SR 243) is a 28.26-mile (45.48 km) long state highway in the U.S. state of Washington, located entirely within Grant County and serving Desert Aire, Mattawa, Beverly and Vantage. The roadway, which roughly parallels the Columbia River, begins at SR 24 southwest of Desert Aire and continues north past the Priest Rapids Dam and Wanapum Dam to SR 26 south of Vantage. The road was established originally as a branch of Secondary State Highway 7C (SSH 7C) in 1957. In 1964, the SSH 7C branch became SR 243 even though the road between SR 24 and Beverly was not complete until 1981.
State Route 243 (SR 243) begins at an intersection with SR 24 southeast of Desert Aire and north of the Hanford Site and Vernita Bridge. From the terminus, the highway travels west and northwest along the Columbia River to the Priest Rapids Dam and Desert Aire to turn north past Mattawa into Beverly. In Beverly, where it crosses railroad tracks formerly belonging to the Chicago, Milwaukee, St. Paul and Pacific Railroad west of the Beverly Railroad Bridge. After leaving Beverly, the roadway passes the Wanapum Dam to end at SR 26, south of its interchange with Interstate 90 (I-90). The busiest segment of SR 243 in 2007 was between SR 24 and Desert Aire, with a daily average of 4,600; in 1970, the same area was the busiest segment with a daily average of 950.
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