State route No. 509.
RCW 47.17.680
in effectA state highway to be known as state route number 509 is established as follows: Beginning at a junction with state route number 705 at Tacoma, thence northeasterly to a junction with state route number 99 in the vicinity of Redondo; also From a junction with state route number 516 at Des Moines, thence northerly to a junction with state route number 99 in Seattle.
A state highway to be known as state route number 509 is established as follows:
Beginning at a junction with state route number 705 at Tacoma, thence northeasterly to a junction with state route number 99 in the vicinity of Redondo; also
From a junction with state route number 516 at Des Moines, thence northerly to a junction with state route number 99 in Seattle.
Source: WA Statutes (Official Site)URL: https://app.leg.wa.gov/RCW/default.aspx?cite=47.17&full=trueFetched: 6/29/2026