Phase one of the project included the construction of a center bent for the new bridge at exit 37 and grading of the new exit 37 westbound off-ramp and eastbound on-ramp and off-ramp. Phase two included work in the westbound lanes and median of I-90 to replace drainage culverts, extend box culverts, begin the installation of the commercial vehicle screening system, construction of the exit 37 westbound on-ramp and off-ramp, continue with the construction of the new exit 37 overpass bridge, and demolition of the existing port of entry building and beginning construction of the new port of entry building.
Phase three is anticipated to be complete by the end of July 2023. Phase four work and final cleanup will occur in August 2023. Phase four work includes grading on Pleasant Valley Road at exit 37, removal of the old bridge at exit 37, and removal of median crossovers.
The prime contractor on the $35 million project is Complete Concrete, Inc. of Rapid City. The project is scheduled for completion by October 2023.