The climbs on this boulder are near vertical. Further, it features some of the better rock quality at Rancho Penasquitos.
This boulder lies at the western section of the waterfalls, on the southern side of the river. When approaching the waterfalls from the main trail, head left, down the stairs, and across the river. The boulder sits to the right, with the climbs facing north.
2 Total Routes
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Mountain Project's determination of some of the classic, most popular, highest rated routes for Thumb Boulder:
Hangnail Left V2 5+ Boulder, 8'
Hangnail Right V4 6b Boulder, 12'
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Hangnail Left V2 5+ CA : San Diego County : ... : Thumb Boulder
A couple different solutions, however both start at a small crimp flake at chest height. The climb is short but sweet and a must try if you make it out to rancho penasquitosEither work up left to work with a gaston crimp or fire big to reach the ledge/rail that connects with the lip....[more] Browse More Classics in CA
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