Here it is:
This is probably tough, but it's in New York state. The river in question flows through the city of Rochester. The waterfall itself has a name, but just a location will be sufficient. More hints will come if necessary.
(http://i121.photobucket.com/albums/o221/rhs993/itsnotatoaster.jpg)
Edit: bigger picture
Middle Falls and the Devonian rock gorge of the Genesee River at Letchworth State Park
too many hints
ouch
that's it
somebody else take the next one, i dont want to have a GTCC and GTPC going at the same time.