 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 . The gap in the roadway was completed by 1933 , and the segment between Toppenish and Prosser was numbered Secondary State Highway 3A ( SSH 3A ) by 1939 , while the segment between the current I @-@ 82 and US 97 was originally numbered as part of Primary State Highway 8 ( PSH 8 ) . These designations remained until the 1964 state highway renumbering , when SSH 3A and the small segment of PSH 8 were renumbered SR 22 . Before the completion of I @-@ 82 through the area , SR 22 continued into the town of Buena , however now that the interstate has been completed , SR 22 has been truncated to the interstate . 
