This is the obvious large fin of rock located on the left side of the road as you start getting into the park. The rock is a hard grey limestone. There are many sport routes and a few trad routes here. The climbs generally appear to be well-bolted, but there are probably exceptions.
Drive past the fin for about 200 yards to a right turn with a sign marking the "bajada al rio" (descent to the river). Drive a very short way to the picnic table and park. Walk about 5 minutes to the fin. You may be able to park closer but please make sure you are well off of the road.
Browse More Classics in Roadside Fin
Mountain Project's determination of some of the classic, most popular, highest rated routes for Roadside Fin:
Unknown 5.10a 5.10a Sport, 1 pitch, 80 feet
Unknown 5.11a 5.11a Sport, 80 feet
Featured Route For Roadside Fin