I think your chances are decent. Especially as a class president and ranked 5th, but, it sounds like perhaps a very small school? No idea where your school is either, since having no honors or AP is unusual.
I was going to make a chance and say 0%, since you misspelled Rochester in your title
You seem to have everything you would need to get into URochester: top 5% class rank/great GPA, lots of leadership, good LoRs, and hopefully good essays. You definitely have a solid chance! I would call it a target for you.