SSH 3T was added to the state highway system by the 1963 state legislature. The bill creating this highway became effective July 1, 1965. This route began at Jct SSH 3A (now SR 22) a few miles SE of Toppenish and headed easterly to Jct PSH 3 (then US 410, now I-82/US 12) near Granger. By 1965 the current state highway numbering sytem had been posted. SSH 3T has never been posted as SSH 3T, only as SR 223.
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