[6] Russian driver Irina Sidorkova was denied a visa to the United States and was forced to miss the event; she was replaced with Caitlin Wood.
Powell, whose disastrous qualifying had placed her firmly on the back foot in the championship fight, made it a four-car battle for the podium as Pulling slid down the inside at the final corner.
Belén García's pace had deteriorated exponentially heading into the closing stages as the leaders pulled away from her fifth place at the rate of 2 seconds per lap.
On the final lap of the race, Powell dived up the inside of Pulling at turn 11 to seal the bottom step of the podium and clawed back another three points in the championship hunt.
[9] The grid was reduced to sixteen cars for the last race of the season – Abbie Eaton was hospitalised with a compound fracture and Marta García withdrew citing mental health concerns.
Sarah Moore had a terrible start from third and slipped back into the midfield, and the two Bunker Racing cars went side-by-side – Fabienne Wohlwend was forced wide over the sausage kerbs, bouncing across them in a similar fashion to Eaton the day before but was unharmed.
Sabré Cook engaged in a battle with Hawkins over eighth; the only American in the field had failed to score a point in any of the races and was keen to impress on home soil.
Wohlwend had suffered a cracked suspension wishbone in her first lap off, and having valiantly held onto a place just outside the points for more than half the race the damage proved too much of a problem and she chose to retire the car.
With Chadwick in a comfortable lead, Powell's chances of winning the championship were becoming increasingly difficult – the Brit used the hurry up from Cook to send one down the inside of García at turn 1, but ran wide and was re-passed.