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January Dinner Meeting

January 26, 2017 @ 5:30 pm - 9:00 pm

January Dinner Meeting

State Route 99 Bored Tunnel: The “ups and downs” of the State’s largest megaproject

Overview: The Alaskan Way Viaduct has been a fixture on Seattle’s waterfront and a vital north-south route through downtown for more than 60 years. The Washington State Department of Transportation is replacing the seismically vulnerable structure with the nation’s largest-diameter bored tunnel and other projects. Join us for an overview of this project and insight into the geotechnical challenges encountered, including ground settlement observations while mining with the 57.5-foot diameter TBM, and the unexpected results of groundwater depressurization in the Pioneer Square neighborhood.

David Sowers, P.E.
Deputy Program Administrator – Engineering and Program Management
Alaskan Way Viaduct Replacement Program

 David Sowers is WSDOT’s Deputy Program Administrator for Engineering and Program Management with the Alaskan Way Viaduct Replacement Program. After working for HWA GeoSciences for six years, David joined WSDOT and, for the last 17 years, has delivered large, complex projects through roles at Headquarters, Washington State Ferries, and now with the Alaskan Way Viaduct Replacement Program.  David has Civil Engineering degrees from Michigan State University and Auburn University and is a registered professional engineer.




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January 26, 2017
5:30 pm - 9:00 pm


ASCE Geotech Seattle


Best Western Plus Executive Inn, Seattle
200 Taylor Ave N
Seattle, WA 98109 United States
(206) 448-9444