Rain on Saturday meant that the pole was effectively decided during the Qualification 1 session on Friday.
Robert Doornbos led the wet Saturday session to start second beside Justin Wilson.
Only two cars failed to finished, with both Katherine Legge and Jan Heylen both running into problems just before the checkered flag.
None Attendance for the 3 day race weekend was 72,211 with approximately 30,000 people on hand for the Sunday Champ Car main event.
On October 12, 2017, it was announced that the IndyCar series will return to Portland during the 2018 Labor Day holiday weekend - Aug 31-Sept. 2, 2018.