Ravinia is the Chicago area's premier outdoor concert venue. Prior to the construction of the overpass, pedestrians crossed several commuter tracks at grade from the parking lots to the west to the venue to the east. ESCA was the Engineer of Record for the retaining walls and the bridge. Construction was completed without disruption of Metra or UPRR traffic, between the end of the concert season on Labor Day and the beginning of hte next season the following Memorial Day.