SR 518 Off-Ramp to Des Moines Memorial Drive

Client: WSDOT & City of Burien

Role: Lead Roadway Engineer / Design Manager | CH2M

Dates: October 2012 to December 2018

Stephanie served as the lead roadway engineer and design manager for the interchange of SR 518 and Des Moines Memorial Drive. This work included designing a new eastbound SR 518 off-ramp and the realignment of the eastbound SR 518 on-ramp that was developed by WSDOT in the 2010 Route Development Plan. As the roadway manager, Stephanie also led the geometric design of the WSDOT Interchange Justification Report (IJR) which included eight ramp design alternatives at the interchange. Her work also included WSDOT Channelization Plans for Approval, Design Variances and a Practical Design Analysis. This project includes a new bridge over 8th St SE, significant retaining walls, and minimizing right-of-way impacts to adjacent contaminated soils. Her work included multi-agency coordination with the following stakeholders: Port of Seattle, Department of Ecology, Seattle Public Utilities (SPU), City of Burien, and WSDOT.

The City of Burien led the project from preliminary design to the 90% design level, but once the project received legislature funding from Connection Washington Package WSDOT became the owner of the project.  In 2017, Stephanie completed a BRT Capacity Alternatives Assessment for WSDOT to be forward compatible with future ST3 plans.  Stephanie’s tenure on the project concluded after providing services during construction.