Just across the line into PA from the Corning area there are several rustic falls along the developing Mid State Trail
http://www.hike-mst.org (MST), PA's answer to the FLT as the longest volunteer-marked footpath in the state.
Nelson Falls - Naturally created in 1936 cutting off a long oxbow of Cowanesque River. Height is variable as it plunges into the head of Cowanesque Lake flood-control reservoir (dammed in 1980). On south side of PA Route 49, trailhead on west side of the 1st Cowanesque River bridge coming west from US Route 15 at Lawrenceville. Located on public property, US Army Corps of Engineers. Less than a quarter mile from the trailhead and partially visible from the PA 49 bridge. Perennial flow. Not in any book I've seen.
Sand Run Falls - Located in Tioga State Forest at the end of a 6 mile loop marked trail from a paved road (Arnot Road) or a 1 mile mostly unmarked trail from a very long seasonal gravel road, Landrus Road, between Arnot (near Blossburg) and Morris. About 30' high. Mid State Trail will approach this from yet a 3rd direction (scheduled opening July 2007) and also visit a flume on nearby Babb Creek and a 12' falls on a nearby unt of Babb Creek locally called Rattlesnake Run. Sand Run is perennial but fairly low in summer when it's possible to walk across the top like Ebenezer's Crossing on the FLT west of Watkins Glen (don't sue me if you trip and fall directly over the falls). Not a walk in the park. This one makes it into the books.
Nickel Run Falls - Also located in Tioga State Forest this 30' falls is unknown even to most locals, will be accessed by a spur path from MST after July 2007. The shortest way in from the long gravel Landrus Road will involve fording Babb Creek in the middle of the ghost town of Landrus (only possible in summer low) and heading back on to-be-marked MST which is on the other side from the road, 2 miles one way to reach the branch trail. Not in any book I've seen but you can see a view of part of it at
http://landrus.blogspot.com click on Nickel Run on right hand side of page.
Stony Fork - A relatively well known series of local swimming holes in Tioga State Forest. MST (marked for two years now, here) is on one side of the creek and a gravel road is on the other side. The gravel road intersects PA Route 414 between Blackwell and Morris, about 12 miles from the US 15 expressway, but the Babb Creek bridge is no more, if you obey the warning sign at the ford it's a long way around driving nearly to Wellsboro and back out. This is in some of the books.
Mossy Run - MST climbs wildly (no CCC stonework here!) and steeply through this ravine on the west/roadless side of Stony Fork Creek in Tioga State Forest passing 3 - 10'+ waterfalls on a small unnamed tributary that gets pretty low in summer. Not in any book I've seen.
I could try to generate coordinates if there's interest.
Not on the MST there are a number of falls in the Pennsylvania "Grand Canyon" in Tioga State Forest. A book by Chuck Dillon Short Hikes in Pennsylvania's Grand Canyon is a gateway to many of these, he's not afraid to leave the blazed trails for old log skids or plain bushwhacking, again not treks for fans of CCC stonework.
Hopefully some of you GOOD photographers will make it down there someday!