Dalton Nixon added 14 points for the Cougars (22-8, 11-6 West Coast Conference) and Childs had 13 rebounds for his 14th double-double. The third-place Cougars close the regular season at home on Saturday against league-leader and No. 6 ranked Gonzaga.
Marcus Shaver Jr. scored 21 points for the Pilots (10-20, 4-13), who dropped their fifth straight.
Childs had six points as the Cougars scored eight straight points and Bryant had a 3-point play to end what turned into a 13-2 run for a 24-13 lead midway through the first half. Childs had 15 points as the Cougars led 42-28 at the break.
Portland scored nine straight to get within nine with 12:07 to go but got no closer. A Shaver trey at the 5:21 mark was the last time the Pilots trailed by single digits.
Top recruits are starting to take their official visits, meaning it's time to make some predictions about where they're leaning.
The cream of the crop of American high school basketball will congregate in Colorado Springs from Oct. 5-7, as USA Basketball unveils its newly expanded Junior National Team minicamp in collaboration with the NBA, NCAA and NBPA.
Missouri guard Cullen VanLeer is retiring from basketball after tearing his ACL in the Tigers' final regular-season game last season.