You should get admitted - no problem. However, if you are looking for a good academic scholarship you need to boost your ACT to 32. If you can get your ACT to 33 or better, you will have a good chance at getting into the U of Michigan honors program (if interested).
I was amazed to find out the difference a point or two on ACT can make in merit scholorship award $$$ at public universities. Generally a composite score of 33 or higher is where to be for top awards. I thought a 32 was good enough (decided not to retake the test) but, a 33 could have made a difference in the award amount.
Re-take the ACT, a slightly higher score may open a few doors.