Colorado (7-3) shot 45 percent from the field and led for all but 22 seconds early in the first half.
Booker was 6-of-12 shooting from the field and 14 of 14 from the free throw line. Johnson made 6 of 14 field goals, including a pair of 3-pointers, and hit all six of his free throw attempts.
Wesley Gordon added 11 points and Jaron Hopkins chipped in with 10 for Colorado, which was playing its first game in nine days.
Tommy Hamilton IV had 16 points and Billy Garrett, Jr. added 15 to lead the Blue Demons (6-5).
DePaul shot 33 percent from the field and dropped their fourth consecutive game after a 6-1 start this season.
Colorado led at 36-33 at halftime.
Colorado Downs DePaul
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