A roadway has existed since before 1926, connecting Toppenish and Prosser near the current alignment of SR 22, however the roadway was incomplete, with a gap existing between Satus and Mabton [REF].
In Spring 2011, WSDOT began a $4.63 million construction project to build wider lanes and shoulders on SR 22 between I-82 and the city of Toppenish, because of a number of collisions along the roadway.