A state highway to be known as state route number 518 is established as follows:
Beginning at a junction with state route number 509 near Sunnydale, thence easterly to a junction with state route number 5 in the vicinity of Seattle.
RCW 47.17.715
State route No. 518.
1970 ex.s. c 51 s 144.
Official source: Washington State Legislature. Reproduced from public-domain Washington statutes; confirm against the official source for the current text. Not legal advice.