In 1973 , SR 20 Spur became SR 213 , while another SR 20 Spur was established in Anacortes .
During a highway renumbering in 1964 , PSH 16 became SR 20 and the branch of PSH 16 became SR 20 Spur .
In 1973 , SR 20     became SR 213 , while another SR 20     was established in Anacortes .
During a highway renumbering in 1964 , PSH 16 became SR 20 and the branch of PSH 16 became SR 20 Spur .