"I would recommend SDA to you without reservation and believe that SDA would be a tremendous assist to your team"


SDA recently completed construction drawing and bid specifications for a rock-textured, tie-back wall including a Low Impact Development (LID) bioretention facility and is assisting the City with NPDES compliance support. It has been my experience that SDA is a responsive, skilled, supportive engineering firm, and the City appreciates their continued good work and outstanding client service.

Steve Leniszewski, PE

Public Works Director, City of Duvall Washington



Bellevue Braids

I-405 Bellevue, Washington

Microsoft Building 83

Redmond, Washington


Othello Station North

Seattle, Washington


Nettleton P.U.D

Kirkland, Washington


Alderwood Mall

Lynnwood, Washington

I-90 Hyak

Snoqualmie Pass, Washington



Everett, Washington


SR 530

Oso, Washington