Project Info:

Location: Salt Lake City, Utah

Role: Subconsultant

Owner: Utah Department of Transportation

Client: : Michael Baker Corporation

Construction Cost: $70,000,000


  • Highway/Roadway Design
  • Digital Terrain Modeling
  • Hydraulic Analysis/Design
  • Hydraulic Modeling
  • Project Development and Environment (PD&E) Study
  • Intersection Analysis/Design
  • Advanced Traffic Management System (ATMS) Planning/Design
  • Cost Estimate Development
  • Signal Design
  • Signing Inventory
  • Utility Coordination
  • Utility Engineering


As an existing two‐lane road with an intermittent two‐way left turn, 5600 West is a major trucking route that lacks the capacity to meet current and future demand. The Utah Department of Transportation (UDOT) initiated to widen roughly three miles of 5600 West from 2100 South (SR 201) to I‐80 from two to five lanes. The model‐based design and construction project will be delivered as a fully 3D package with no paper plans. Lochner is responsible for preparing the environmental categorical exclusion document, designing the corridor’s advanced traffic management system (ATMS), developing roadway and drainage improvements, coordinating utilities, and developing sewer and water design plans.

The Lochner team, as part of the categorical exclusion document, coordinated with the Utah Department of Environmental Quality (UDEQ) regarding a historic landfill found within project limits. To determine the potential for hazardous materials to be discovered during construction, appropriate soil testing was completed. Lochner used the findings to prepare a contingency plan, which included a course of action in the event hazardous materials were discovered within project limits and subsequently were in need of disposing. This plan helped inform the roadway design and resulted in less expensive and less impactful solution for UDOT and the surrounding community. Lochner also surveyed the project site for wetlands and adjusted the roadway alignment to prevent fill from entering environmentally sensitive areas.

The corridor’s new ATMS, which will install fiber cable alongside the roadway and upgrade all intersections to include CCTV, was designed by the Lochner team. This system will connect to an existing network, allowing traffic signals to be coordinated and monitored from a central location for optimal efficiency. Lochner developed the signal design plans to convert the existing I‐80 diamond interchange to a diverging diamond interchange. The new configuration will make the interchange more efficient and safer by eliminating conflict points for motorists. Lochner’s water and sewer designs are being coordinated with Salt Lake City, and additional stakeholder coordination is taking place. The Lochner team is also providing railroad permitting support.

For the portion of 5600 West from 2100 South to 850 South, Lochner is leading the roadway, drainage, signing, and striping design. This portion of roadway includes the Lee Drain Canal, which crosses under 5600 West, and will need to be extended to prevent the corridor’s fill slope from entering the water. Lochner is also designing a headwall for further protection. Additionally, a multi‐use path alongside 5600 West is being designed, which will connect to the future Mountain View trail system. Lochner is coordinating the segment’s plans with the rest of the corridor’s design segments.