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UDOT I-215 Redwood Road DDI Interchange


Utah Department of Transportation

Project Type:

Engineering & Design


North Salt Lake City

UDOT I-215 Redwood Road DDI Interchange Project Image 1

About the Project

Poor soils require award-winning diverging diamond freeway interchange design

The Utah Department of Transportation (UDOT) targeted the intersection between Interstate 215 and Redwood Road (SR-68) in North Salt Lake City to improve traffic flow. UDOT wanted to widen Redwood Road and use the existing two-lane bridge over I-215 as part of a diverging diamond interchange (DDI) that would span the highway, among other improvements. UDOT called upon Stanley Consultants for 100 percent design of the $30 million project. The Redwood Road DDI would require an unusual configuration because of local soil conditions. If the new bridge required to complete the DDI were located next to the existing bridge, it would create a drag on the old bridge, which could cause it to sink to the point of failure. The final design reduced the new bridge’s angle that it crosses over the freeway, saving on construction cost because the design shortened the bridge. The intersection won the Engineering News-Record Mountain States 2020 Best Project in the highway and bridge category.

By The Numbers

  • 3

    Miles of Asphalt

  • 2.5

    Miles of New Concrete


Engineering Planning & Consulting

At Stanley Consultants, we understand that planning and consulting include every aspect of engineering. We use the best tools available to create designs and master plans built for longevity, resiliency, and sustainability.

Program Management

Stanley Consultants brings more than 200 areas of engineering and architectural expertise to our program management services, with program delivery, program integration and project cost management at the heart of all we do.

Project Management

At Stanley Consultants, we offer a broad range of professional expertise in construction management and constructability reviews to meet project objectives and deliver results.

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