Using Nationwide Expertise to Advance Pacific Northwest Infrastructure

With TKDA, you receive local experience and nationwide expertise to elevate Pacific Northwest communities, cities, and counties.



We help communities thrive. Put our integrated engineering, planning, and other specialized services behind your facility and transportation infrastructure needs, and we’ll help you create sustainable, inclusive, and resilient spaces.

National Expertise

We draw from over a century of experience and have completed transportation and facility infrastructure projects nationwide. Our highly engaged team is invested in providing innovative, lasting solutions. We go deep to understand what our clients and communities care about most, from border to border, coast to coast.

Local Experience

We recognize that to best serve clients, we need a local team to foster the success of our projects. With offices in Seattle and Bainbridge Island, we have a robust and responsive team ready for our Pacific Northwest clients. By coupling our technical and local expertise, we create an unwavering commitment to successful project deliverables.

Integrated Team

TKDA’s in-house team of engineers, designers, planners, surveyors, and specialized experts draw on each other’s strengths to offer a wide range of services for your transportation and facilities needs. Woven together, our teams form a strong firm, ensuring seamless coordination and communication to efficiently tackle complex projects and accountability.

Buildings and Sites

For more than a century, TKDA has crafted the spaces and buildings that make our communities vibrant and livable. Our multi-disciplined team of designers, interior designers, and civil, electrical, mechanical, and structural engineers collaborate to enhance facilities and sites. We work together to provide building infrastructure improvements and assessments on education and campus, civic, parks and recreation, public works, and transportation facilities. At TKDA, we see these structures as hallmarks of thriving communities, worthy of focused, specialized attention to long-term stewardship through asset management, condition assessments, and thoughtful design.


TKDA’s team of transportation experts understands the unique challenges of each mode of transportation. Our collaborative teams and commitment to quality have made us a trusted partner in solving even the most complex transportation challenges for aviation, rail, and surface transportation projects. We design innovative solutions that meet the transportation needs of a company while considering environmental impacts and accessibility. With a focus on safety and high-functioning multi-modal access, our deep bench of transportation engineering, planning, and construction administration expertise allows us to provide sustainable results for clients.

Featured Case Studies

We take pride in our ability to solving complexity and creating innovative solutions that meet the unique needs of our clients. Our case studies showcase our expertise across a range of buildings, sites, and transportation infrastructure projects.

Washington State Ferries Eagle Harbor Welding Shop

TKDA is currently leading the terminal design engineering for the Washington State Ferry’s (WSF) Eagle Harbor Welding Shop replacement project. We are providing structural design for a 6,400 SF single-story steel structure on deep foundations and equipment shop renovation supporting ferries preservation of their maintenance facility. We have a mechanical and electrical team supporting our work as prime engineering consultants.

SR 509 Phase 1B, I-5 to 24th Avenue S

The project will provide an alternative to the I-5 through Seattle, reducing traffic congestion, connecting freight links, and alternate access to SeaTac airport. TKDA is the engineer of record for the noise walls, retaining walls (MSE and Soil Nailed), monotube steel structures (WSDOT standard and non-standard) and foundations, and water main design for highline water district.

Contact Us


Regional Vice President, Northwest Region
Contact Dan


Seattle Area Manager
Contact Jaime

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