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State Route 99 Tunnel

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Tearing down the Alaskan Way Viaduct and transforming Seattle's waterfront

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The Alaskan Way Viaduct: How Seattle chose the Bertha tunnel alternative

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ALASKAN WAY VIADUCT TUNNEL REPLACEMENT TUNNEL+SPACE NEEDLE

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Shaping Communities: Alaskan Way Viaduct Replacement Program

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Tunnel to replace Alaskan Way Viaduct, Seattle, US

The State Route 99 tunnel, also known as the Alaskan Way Viaduct replacement tunnel, is a bored highway tunnel in the city of Seattle, Washington, United States. The 2-mile (3.2 km), double-decker tunnel carries a section of State Route 99 (SR 99) under Downtown Seattle from SoDo in the south to South Lake Union in the north.
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  • Description 

  • Route 

  • Tolls 

  • Viaduct and earthquake risks 

  • Options and political debate 

  • Bored tunnel selection 

  • Design and funding 

  • Construction 

  • Opening