There is a decent 25 to 30 footer right near cabelas in hamburg. It's right on the schuykill river. I forget how you get there but it ain't far from cabelas, maybe north on 61 a piece or something.
Go to glen onoko falls in jim thorpe and jump the bridge, it's a train tressel at least 40 or 50 foot and kids jump there all the time. It's a 40 minute drive up the northeast extension but coupled with the climbing and hiking there it is worth it. lehigh gorge state park glen onoko access.
Also see if you can find any info on the slatington quarry, but that's up the turnpike a bit too.