How deep is the 99 tunnel in Seattle?
Also to know is, how deep underground is the 99 tunnel?
approximately 211 feet
Consequently, is the Highway 99 tunnel open?
The tunnel opened to drivers on Feb. 4, 2019. Crews are completing the northbound off-ramp to downtown and Alaskan Way.
After 4 Years, Seattle's Giant Tunneling Machine Finally Breaks Through. Bertha has broken through. After dropping into a pit in July 2013, it started digging the tunnel that will hold the replacement for the Alaskan Way Viaduct, an elevated highway that was partly demolished after being damaged by a 2001 earthquake.