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It is a little chossy here or there, but the bad holds can be avoided and the signature climbing is sufficiently unique to justify bothering with the climb, especially since it is a mere 2 minutes off of the trail.
From the notch to the North side of the summit of the East Sentinel, separating it from the Lost Sentinel, look Southward into a right-leaning squeeze-chimney that goes to the summit. Climb that feature.
To descend, replace the webbing anchor and rap, or reverse the route.
This route ascends the right-leaning chimney that goes to the summit starting from the notch due North of the small but spire-like summit.
You could probably get a piece in overhead from 3-4" in the chimney and maybe a smaller piece below, but watch out for the flake at the squeeze entrance. It might hold a climber but not gear.