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Mission Statement

Provide practical structural and civil engineering solutions to meet our customer’s needs

Tri-Cities Engineering PLLC serves Eastern Washington, Oregon, Idaho and surrounding areas. We are a small engineering firm focused on providing high quality, prompt and affordable services to our customers. We have over 40 years combined experience in structural and civil engineering. Tri-Cities Engineering PLLC is licensed in Washington, Oregon, California, Idaho and Montana. We look forward to working with you.

Some of the areas we currently serve are:

  • Tri-Cities, including Kennewick, Pasco, Richland, West Richland, Benton City, Burbank, and Walla Walla
  • Yakima Valley, including Yakima, Sunnyside, Prosser, Mattawa, and Ellensburg
  • Wenatchee/Central Basin area, including Wenatchee, Ellensburg, Cle Elum, Chelan, and Moses Lake
  • Spokane Valley, including Spokane, Spokane Valley, and Coeur d’Alene
  • Vancouver area, including Vancouver, Lake Oswego, and Portland






Rigo Rangel, PE

Structural Engineer

Rigo has worked for 20 years in structural engineering and project management. Previously he worked in the area with Bechtel as a Structural Engineer and Canam Steel as a Design Engineer. Rigo has experience engineering simple residential structures to large multi-family buildings and commercial projects.

Zachary Wright, PE

Structural/Civil Engineer

Zach has experience in both civil and structural engineering and has built a reputation with clients as friendly, dependable and responsive. He has worked on a broad range of residential structural projects, including lateral and vertical designs, shop and pole building designs and additions. He is also familiar with metal building foundations and retaining wall designs.   Zach also has more than 10 years of experience as a civil engineer in residential and commercial development and commercial projects. Zach is a licensed Professional Engineer in Washington, Oregon and California.

Priscilla Lopez-Steen, PE

Structural Engineer

Priscilla was born and raised in the Tri-Cities. She graduated with a BS in Civil Engineering from Washington State University – Pullman. Priscilla has 5 years of experience in civil construction and structural design.
She is highly motivated, organized and resourceful.

Randy Mattila

Structural Design Engineer

Randy was born and raised in the construction industry and has built, designed and engineered structures from start to finish. He spent 5 years working for his father’s construction company and 2 years as an architectural design professional before entering the engineering discipline as a structural designer. His expertise in the field allows him to provide a quality and efficient product.

Carlos Jimenez

Structural Design Engineer

Carlos graduated from WSU-Tri Cities with a BS in Civil Engineering. He started his career with Tri-Cities Engineering in 2016. He focuses on delivering reliable structural designs for both commercial and residential buildings.