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Map of automated gate locations

This map shows the where the automated traffic control gates are located on State Route 99 in Seattle. The automated viaduct closure gates system improves safety by preventing people from driving onto the Alaskan Way Viaduct after a moderate to severe earthquake. 

Gate locations

Northbound

  • SR 99 at East Marginal Way South
  • West Seattle Bridge to northbound SR 99
  • West Seattle Bridge to northbound SR 99 at the collector/distributer
  • On-ramp to northbound SR 99 at S. Royal Brougham Way
  • On-ramp to northbound SR 99 at Battery Street Tunnel
  • SR 99 at S. Lander Street


Southbound

  • On-ramp to southbound SR 99 at Columbia Street
  • On-ramp to southbound SR 99 at Elliot Avenue
  • Southbound SR 99 near the Battery Street Tunnel