I live in Mansfield so i dont know where its at, but one of my friends moved to Cinci and he raves about the cliff jumping down there. Another friend of mine went down to visit and said it was nuts there were a ton of spots and some up to 70feet. Good luck finding them and post if and when you do.
I know of a ton in cleveland and toledo. Cinc not sure.. Id call a state park office and ask. say your trying to photograph waterfalls for a photo project, let me know what you find