Bristol made her first six shots and finished with six rebounds as Arizona (19-3, 8-2 Pac-10) improved to its best start ever in conference play.
Angela Lackey scored 17 points, Tatum Brown added 15 and Elizabeth Pickney and Lisa Griffith had 13 apiece for the Wildcats.
Washington (7-15, 3-7) was led by Megan Franza's 18 points. LeAnn
Sheets added 14 and Loree Payne 13 for the Huskies.