South Boeing Access Road over Airport Way Seismic Retrofit

The South Boeing Access Road over Airport Way project will provide structural analysis and seismic retrofit for the existing concrete structure.

The work performed by 1 Alliance consisted of performing limited topographic mapping to provide a preliminary base map for project improvements. 1 Alliance located and mapped visible features for engineering design within the mapping corridor, including roads, surface utility features, overhead power limes, stairs, slopes, geotechnical boring locations, and bridge columns.

The primary objective of this project is to provide a viable retrofit design and to prepare the PS&E for advertisement of the seismic retrofit construction project.

Project Details


City of Tukwila


Tukwila, Washington


2018 – 2019