BRIDGES

HWA performed geotechnical engineering studies for design and construction of a new 220 foot long, 45 foot wide, 3-span bridge crossing the Sammamish River between Redmond and unincorporated King County.

Originally constructed in 1912, the existing Broadway Bridge carries Broadway Avenue over the BNSF Railway Main Track. The design team addressed various constraints. HWA worked with the design team to develop a subsurface exploration program that would provide required soil information for various bridge replacement alternatives.

HWA is currently providing geotechnical engineering design support for the replacement of parallel bridges. We conducted finite element analysis to develop alternatives for stabilizing the site, given standard AASHTO seismic parameters. HWA determined that reductions in seismic waves associated with soft lake sediments were large enough that utilizing site-specific seismic parameters negated the need for implementing slope stabilization methods. Efforts saved the City 18M in construction costs.

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Bridges

York Bridge

Broadway Bridge Replacement

Fairview Avenue Bridge - SDOT

Broadway Bridge Replacement