520 bridge Portage Bay concept designs unveiled
SR 520 Portage Bay Bridge Box Girder design concept - Cascade Mountains and Montlake Neighborhood from Delmar Dr E
Credit: WSDOT
The structure includes traditional highway girder and beam structures. WSDOT has experience building these, and there are no cables or towers to be seen. There is more in-water work and pilings, a thicker deck and more supports beneath the bridge in this design
