SR99 Deep Bored Tunnel

Location: Seattle, Washington (2019)

Owner: Washington State Department of Transportation (WashDOT)

Prior Experience: Eldon Abbott

SR99 is a $1.9 Billion WashDOT project. The tunnel is approximately 2 miles long and will replace the aging Alaskan Way Viaduct that was damaged in the Nisqually earthquake in 2001. Eldon Abbott, PE served as the Task Lead for the development of the Design-Build Criteria documents. The tunnel consisted of 50- foot internal diameter, with the roadways stacked one over the other, with two lanes in each direction. Eldon continued to serve as part of the risk assessment team on behalf of the owner. The Design-Build contract was awarded in 2010 and the tunnel construction was completed in 2019.