SSH 5D and SSH 5G were established during the creation of the Primary and secondary state highways in 1937, and SSH 5N was established in 1955 to Eatonville and extended south to PSH 5 near La Grande in 1967 after SR 161 was created.
SSH 5D and SSH 5G were introduced during the formation of primary and secondary state roads in 1937, and SSH 5N was created in 1955 to link Eatonville and extended south to PSH 5 near La Grande in 1967 after SR 161 was created.