We've been doing this for 20 to 25 years and climbers know there are many other alternatives. We've modified the closures over the years to accommodate the birds. They may use one nest one year and another nest the next year, but it's all in the same territory.
You could look for hours at that sheer cliff trying to see a little hole in it. You're better off watching for the adults on the wing or checking with the visitor's center on nest locations.