My opinion is that college rankings matter very little in the fields of physical and occupational therapy. CAPTE and ACOTE, the respective groups that handle accreditation for both professions are VERY strict. Meaning that every accredited program will be able to give you a great education. There is a ranking system from US News (http://grad-schools.usnews.rankingsandreviews.com/best-graduate-schools/top-health-schools/occupational-therapy-rankings) however the numbers vary pretty widely year to year, are seem pretty subjective.
If you need to find a good school, I'd go straight to the horses mouth and use this link (http://www.aota.org/Education-Careers/Find-School.aspx) to look up schools on the East Coast. I know that's not exactly what you asked but I hope it helps.