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SR 509 Phase 1 of Gateway Project

SR 509 Puget Sound Gateway Project Phase 1

SR 509 Phase 1 of the Gateway Project

  • Build one lane in each direction between South 188th Street and 28th/24th avenues south
  • Add second lane in each direction between I-5 and 28th/24th avenues south
  • Add truck climbing lanes in each direction as needed where steep grades exist
  • Complete the interchange at South 188th Street and SR 509
  • Replace the interchange at SR 516 to include new I-5 collector-distributor lanes between SR 509 and SR 516
  • Build a new southbound I-5 lane between SR 516 and South 272nd Street
  • Build new interchanges:
    • SR 509 and I-5
    • To/from the east at 28th and 24th avenues south
    • To South 231st Way and the Kent Valley