That's a pretty incredible location! Many years ago the only unusual fern I found there was Asplenium trichomanes (right hand side of the road as you head to the dam, on a bank.)
It really is, there’s something like 6-7 locally rare fern species in pretty close vicinity to one another, well worth the trip. I’m thinking it’d be cool to run a CNM field of some sort out this was later in the year if you’d be interested in heading out there.