I am a sophomore in high school. In the semester that just ended I passed all of my classes with a B except for one, Algebra 2 which dropped my GPA just below a 3.0 Is there anyway I can still get into a UC school.
You are worrying too early. You still have junior year to work on your grades.
https://rogerhub.com/gpa-calculator-uc/
You need to pass all A-G courses with a C or higher. The 3.0 GPA requirement for A-G courses is based on the UC GPA calculation which I have given you a link. It is weighted and will take into consideration up to 8 semesters of UC approved Honors/AP/IB or DE courses for the capped weighted and unlimited honor points for greater than 8 semesters of these courses during 10-11th grade. Senior grades are not considered in admission decisions but HS course rigor will be noted.
As @aunt bea stated, it is too early to worry. Just keep doing well in all your classes and try to get mainly A’s and B’s in all the a-g courses and you will qualify to apply to the UC’s.
I also suggest you look at the Freshman profiles for all the campuses to get an idea of selectivity and test score ranges needed to be a competitive applicant.
http://admission.universityofcalifornia.edu/freshman/profiles/
I agree with @gumbymom and @auntbea it is simply too early to tell. Look at the freshman profiles to see where you need to be and note than most of the UCs now have average admission GPAs above 4. (just UCR, UCM and UCSC are below that mark - and all 3 are well above the published 3.0 threshold)
You should also know, there are lots of very good college options outside the UC system. Do your best and keep an open mind about your future.
Good luck.
You have second semester of sophomore year and your entire junior year to raise your GPA. Work at algebra 2 more next semester, but don’t stress out right now. You have more than plenty of time to raise your GPA. If you take a couple AP classes your junior year, getting an A in them will raise your GPA faster.