Williamson Rock is under a temporary closure to all recreational uses, including climbing, pursuant to a ruling by the U.S. Fish and Wildlife Service that the area is critical habitat for the endangered yellow-legged mountain frog. Efforts by the non-profit organization Friends of Williamson Rock, in conjunction with the U.S. Forest Service, are underway to regain climbing access to Williamson. For information on the status of these efforts, and to learn how you can help, contact the Friends of Williamson Rock: williamsonrock.org
This information is a public crowdsourcing effort between the Access Fund,
and Mountain Project. You should confirm closures, restrictions, and/or related dates.
Despite it's large size this formation has but a handful of toprope routes scattered across it's east face. Routes range from 5.4 to 5.8 and tend not to be terribly exciting.
Approach as for The Pyramid then hang a right passing along the south face and slog uphill to the now visible formation up and left at the top of the ridge. The approach takes about 45 minutes from the closest parking area.