![Washington's Highway 99: Images of America Series – Cowlitz County Historical Society © 2021. All rights reserved. Washington's Highway 99: Images of America Series – Cowlitz County Historical Society © 2021. All rights reserved.](https://i0.wp.com/cowlitzcountyhistory.org/wp-content/uploads/2021/05/Images-Hwy99.jpg?fit=750%2C1071&ssl=1)
Washington's Highway 99: Images of America Series – Cowlitz County Historical Society © 2021. All rights reserved.
![Seattle, Washington: The northbound entrance of the new SR 99 Tunnel. The two mile long, bored road tunnel is replacing the Alaskan Way Viaduct, carrying State Route 99 under downtown Seattle from Seattle, Washington: The northbound entrance of the new SR 99 Tunnel. The two mile long, bored road tunnel is replacing the Alaskan Way Viaduct, carrying State Route 99 under downtown Seattle from](https://c8.alamy.com/comp/R22AM4/seattle-washington-the-northbound-entrance-of-the-new-sr-99-tunnel-the-two-mile-long-bored-road-tunnel-is-replacing-the-alaskan-way-viaduct-carrying-state-route-99-under-downtown-seattle-from-the-sodo-neighborhood-to-south-lake-union-e-of-the-art-tunnel-credit-paul-christian-gordonalamy-live-news-R22AM4.jpg)
Seattle, Washington: The northbound entrance of the new SR 99 Tunnel. The two mile long, bored road tunnel is replacing the Alaskan Way Viaduct, carrying State Route 99 under downtown Seattle from
![Seattle, Washington, USA. 4th January, 2019. Southbound traffic passes the future onramp of the SR 99 Tunnel as the Washington State Department of Transportation prepares for the highway's permanent closure. A two-mile Seattle, Washington, USA. 4th January, 2019. Southbound traffic passes the future onramp of the SR 99 Tunnel as the Washington State Department of Transportation prepares for the highway's permanent closure. A two-mile](https://c8.alamy.com/comp/RAN30F/seattle-washington-usa-4th-january-2019-southbound-traffic-passes-the-future-onramp-of-the-sr-99-tunnel-as-the-washington-state-department-of-transportation-prepares-for-the-highways-permanent-closure-a-two-mile-long-bored-road-tunnel-is-replacing-the-alaskan-way-viaduct-carrying-state-route-99-under-downtown-seattle-from-the-sodo-neighborhood-to-south-lake-union-the-viaduct-is-scheduled-to-close-permanently-on-january-11-so-crews-can-move-state-route-99-from-the-viaduct-to-the-state-of-the-art-tunnel-credit-paul-christian-gordonalamy-live-news-RAN30F.jpg)
Seattle, Washington, USA. 4th January, 2019. Southbound traffic passes the future onramp of the SR 99 Tunnel as the Washington State Department of Transportation prepares for the highway's permanent closure. A two-mile
![Travel Advisory: Plan ahead for lane reductions on State Route 99 Aurora Bridge overnight on June 4 and June 18 - SDOT Blog Travel Advisory: Plan ahead for lane reductions on State Route 99 Aurora Bridge overnight on June 4 and June 18 - SDOT Blog](https://sdotblog.seattle.gov/wp-content/uploads/sites/10/2021/06/25987074646_6466141350_o-scaled-e1622768540362.jpg)
Travel Advisory: Plan ahead for lane reductions on State Route 99 Aurora Bridge overnight on June 4 and June 18 - SDOT Blog
![State Route 99 run through Downtown Seattle during rush hour in evening, Washington, United States Stock Photo - Alamy State Route 99 run through Downtown Seattle during rush hour in evening, Washington, United States Stock Photo - Alamy](https://c8.alamy.com/comp/RD7XH6/state-route-99-run-through-downtown-seattle-during-rush-hour-in-evening-washington-united-states-RD7XH6.jpg)