Do the colleges only see the ACT composite?

I recently took the March SATs. I got a 2120, which is not high enough for my top choice of Dartmouth (especially when my reading score was 620). I think seeing my reading score alone would deter Dartmouth from accepting me and I fear I won't be able to get this score up near 700. Therefore I am signed up to take the June ACT. Whenever I look for the ranges of scores by college, they only include the ACT composite score, not the individual section scores. If the colleges don't see my reading, but my overall score isn't terrible, I think I may do a bit better. So my question is, do the colleges see the scores by section, or just the composite.