Thunderbolt Peak

Bill, a good resource for climbing-related things is Climber.Org

This is a website with lots of trip reports.

–B.G.–

Thanks for the link. It was somewhat helpful, but not the direct answer that I was/am hoping for.

bill

Summitpost and mountainproject also have info:

http://www.mountainproject.com/v/southwest-chute-1/106983026

http://www.summitpost.org/thunderbolt-peak/150222

Basically via the SW chute it looks like it's pretty easy up the the summit block. The block itself is short enough that people have lassoed the top and aided to the summit. Still no direct answer for your question but it looks like any standard length rope of +50m will suffice since you really only need it on that summit block.