Bourdais circled the 4.048-mile road course in one minute, 43.046 seconds. It was his fourth pole win of the season and ninth of his Champ Car career.
Starting on the front row with Bourdais will be provisional pole winner Ryan Hunter-Reay, who posted a time of 1:43.909 on Friday. Jimmy Vasser (4:43.374) and Bourdais' teammate Bruno Junqueira (1:43.606) will start in the second row.
Bourdais leads the championship through the first seven events. He holds a 28-point margin over teammate Junqueira (186-159). Defending series champion Paul Tracy (142) is third following his win two weeks ago at Vancouver.
Tracy ended the session by crashing into a tire wall with three minutes remaining. The red flag cost the Canadian his fastest lap, but he will still begin sixth in the 18-car field.