A state highway to be known as state route number 510 is established as follows:
Beginning at a junction with state route number 5, thence southeasterly via St. Clair to a junction with state route number 507 at Yelm.
RCW 47.17.685
State route No. 510.
1970 ex.s. c 51 s 138.
Official source: Washington State Legislature. Reproduced from public-domain Washington statutes; confirm against the official source for the current text. Not legal advice.