Lane Construction


Eglin AFB, FL


Highway & Bridges: Highways & Roadways


Design: Civil Engineering, Structural Engineering

SR 85 Interchange Design-Build

As a result of the U.S. Army 7th Special Forces Group's relocation to Eglin Air Force Base, the Eastern Federal Lands Highway Division of the Federal Highway Administration (EFLHD) anticipated an increase in traffic at the intersection of SR 85 and West McWhorter Avenue from 200 vehicles a day to more than 7,000. To accommodate the additional traffic, STV provided overall design management and engineering support during construction of a grade-separated interchange.

After examining various reconfigurations of the original diamond interchange, STV selected a half-cloverleaf interchange system to avoid a nearby wetlands area and improve crossroad alignment. The design included two loops and linear rounds with two ramps and signalized intersections and a new 247-foot bridge. The team built an evolving 3-D computer model for grade control/survey layout early on in the project. Ultimately, the half-cloverleaf design saved the client $3 million and opened to traffic four months early.