Wallace had 16 points and 11 rebounds, while Kravish had 14 points and 11 rebounds for the Golden Bears (20-9, 12-5 Pac-12), who are in the midst of their longest winning streak in a decade.
Justin Cobbs added 16 points and five assists while helping California clinch a first-round bye in the conference tournament. The Bears won despite an off-night from leading scorer Allen Crabbe, who was held to eight points while being saddled with foul trouble.
Xavier Johnson had 14 points and seven rebounds for Colorado (19-9, 9-7), which lost for only the third time in 11 games.
Jordan Men's Cal Golden Bears Heathered Blue/Gold Basketball Performance PoloShop
Maryland point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.
Louisville's Chinanu Onuaku, who recently underwent a medical procedure to correct a heart rhythm issue detected during the combine, will keep his name in the NBA draft pool.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.