Roads & Bridges Live: The I-85/485 Turbine Interchange--Charlotte, N.C.

Sept. 25, 2012



Date:   September 25, 2012


Date:   September 25, 2012

Time:  2:00 - 3:00 PM Eastern


(click link above to go to the registration page to view the archived webinar)


 The I-85/485 Interchange will feature a two-level turbine configuration that features swirling lanes that take left-turning traffic around a central bridge in a clockwise direction.

The design requires space for sweeping high-speed, high-capacity ramps, and calls for the construction of 18 bridges—three times more than a stacked interchange. However, the spans call for thinner columns, drilled piers, HP pile foundations and spread footings, making construction easier, and the turbine’s flexible ramp placement will result in fewer environmental impacts. The turbine interchange, which is expected to cost $30 million less than the four-level stacked interchange, is scheduled to be complete in early June 2014.

Earn one professional development hour (PDH) by viewing this archived session online.


Jeff Gagné, PE, DBIA

Mr. Gagné is a vice president for STV in Charlotte, North Carolina, where he manages the firm’s North Carolina Transportation Business Unit. 

His responsibilities include overseeing the day-to-day operations of the North Carolina Transportation Division as well as alternate project delivery methods (such as design-build, value engineering, and public-private partnerships) for STV on a national level. Mr. Gagné has been involved with alternate delivery of transportation projects since 1993, leading the firms’ efforts for highway projects in both the private and public sectors throughout the country. He serves on the DBIA Transportation Committee and as Vice Chairman of the DBIA Certification Board. A registered professional engineer in Maryland, Virginia, North Carolina and Georgia, he is also a designated design-build professional from the Design-Build Institute of America.

Mr. Gagné served as an engineer in the U.S. Army during the Persian Gulf War. He received his Bachelor of Science degree in engineering technology from the University of North Carolina at Charlotte.

John N. Johnson, P.E.
STV, Vice President

Mr. Johnson has more than 22 years of experience as a project manager and design engineer for interstate and thoroughfare projects and has provided oversight for projects for numerous municipalities and state Departments of Transportation. As the manager of STV’s civil engineering staff in its Charlotte office, he is responsible for various multidisciplinary projects throughout the state.

He is the project manager for the I-495/I/85 Interchange modification project in Charlotte, NC. This project includes the replacement of the existing trumpet interchange with an innovative turbine interchange. Modification of the eastern I-485/I-85 interchange will provide full access to both interstates and serve as the final link of the Charlotte Outer Loop. The Charlotte Outer Loop will improve access to residential, commercial, and retail centers throughout the Metrolina region by relieving congestion on parallel east-west roadways.

A registered professional engineer in North Carolina, he received his Bachelor of Science in civil engineering from the North Carolina State University.

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