Client

North Carolina Department of Transportation

Location

Charlotte, NC

Market

Highways & Bridges: Highways & Roadways

Services

Planning/Pre-Design

Design: Structural, Civil

I-485/I-85 Turbine Interchange Design-Build

The modification of the existing I-485/I-85 interchange into a fully-directional turbine interchange was the final link in the 67-mile-long circumferential loop around Charlotte, NC. In 2010, the North Carolina Department of Transportation (NCDOT) initiated a design-build-finance advertisement for teams to submit qualifications for the $124 million project. The Lane Construction Corporation/STV design-build team proposed the replacement of the four-level stack with a two-level turbine interchange.

By switching to the turbine layout, the Lane/STV team realized they could achieve numerous advantages that would enhance safety for both motorists and construction workers, while also providing significant cost savings for NCDOT. The project consisted of widening two miles of I-85 to accommodate additional ramp lanes, widening/construction of 1.4 miles of I-485, and the turbine interchange, which was comprised of eight ramps/loops and 19 bridges. The project opened to traffic in June 2015 at a cost of $95 million, $30 million under budget. 

Award Icon Project Recognition

HENRY A. STIKES GRAND CONCEPTOR AWARD 
2016 Engineering Excellence Award
American Council of Engineering Companies of North Carolina

NATIONAL RECOGNITION AWARD 
2016 Engineering Excellence Award
American Council of Engineering Companies

HONOR AWARD 
2016 Engineering Excellence Award
American Council of Engineering Companies of North Carolina

EXCELLENCE IN DESIGN 2015 
Design-Build Project/Team Award – Engineering
Design-Build Institute of America

NATIONAL AWARD OF EXCELLENCE 
2015 Design-Build Project/Team Award – Transportation
Design-Build Institute of America

BEST PROJECT 
2015 ENR Southeast Best Projects – Highway/Bridge
Engineering News-Record Magazine