According to online sources, the average GPA is around 3.5 is at Columbia College and 3.1 at Columbia Engineering, give or take 0.1, and around 3.4 overall. The averages vary across departments and majors, so it really just depends on what you’re thinking of studying.
(As a tentative pre-law myself, I can tell you that engineering/science majors have the highest acceptance rates, and admissions might be more forgiving about your GPA due to the lower school averages.)
Another thing to keep in mind is that a lot of classes are curved, so rather than ask yourself if you can get the raw A, determine if you’d feel confident about your chances of being in the top-10% (or whatever you consider “really good”) among your peers.
Hope this was helpful! :)