A state highway to be known as state route number 410 is established as follows:

Beginning at a junction with state route number 167 at Sumner, thence easterly by way of Buckley, Enumclaw, and Chinook Pass, to a junction with state route number 12 northwest of Yakima: PROVIDED, That until such time as state route number 167 is constructed and opened to traffic on an anticipated ultimate alignment from a junction with state route number 5 near Tacoma easterly to Sumner on the north side of the Puyallup river, the public highway between state route number 5 in Tacoma and state route number 161 in Sumner, on the south side of the Puyallup river, shall remain on the state highway system.