 Following a five-year hiatus, Watkins Glen was added back to the schedule for the 2016 season following the cancellation of the proposed Grand Prix of Boston.However, after the 2017 Season, it was announced that Portland International Raceway would be brought back to the 2018 IndyCar schedule, replacing the Watkins Glen event.The CART series held the first American open wheel racing events at the circuit from 1979–1981.