Spanning over 20 miles, the I-90 Unbonded Concrete Overlay project improved pavement conditions, rebuilt two rest areas, and restored a unique piece of history to the corridor—the gold-tinted concrete panels. Originally installed in 1978 to commemorate the final link of the nation’s longest interstate, these panels symbolized the golden spike of the first transcontinental railroad. Though removed during a 2006 rehabilitation, they were reintroduced with this $91 million project, reconnecting the highway to its historic roots. The existing pavement had deteriorated significantly, leading to poor ride quality and increased maintenance. Minnesota DOT’s goals were to extend pavement life, enhance the driver experience, reconstruct the rest areas, and restore the historic panels.

This project used IIJA funds, which allowed the project to up-scope from a bituminous overlay to an unbonded concrete overlay. Recycled millings from the existing surface were used to produce new aggregate and bituminous materials for reuse on the project. These sustainable methods reduced the need for materials and minimized fuel use for mining and transport.