ApproachIf you ascended Thunderbolt from the Underhill Couloir, retreat to the top of the couloir, and climb southeastward from there. From the top of Thunderbolt, if ascended from a different route, it is necessary to descend to the notch between Starlight and Thunderbolt. There are 2 ways to accomplish this. Weave your way around the summit blocks in a southeasterly direction until you reach a short , steep headwall. You may either descend the headwall (~5.6, maybe a bit less), or veer left to find the top of a chimney. Descend the chimney (class 4), and at the bottom traverse left to easy slabs. This is where the headwall route is re-joined. From here, descend easy slabs to the notch. Route DescriptionFrom the notch between Starlight and Thunderbolt, climb up for 40-50 feet, staying just below the crest of the ridge.The climbing will tend toward the ridgeline, and you should join the ridgeline when practicable. Stay on or very near the ridgeline until just below the Milk Bottle. Traverse out right on ledges until you encounter a corner leading up just left of the Milk Bottle. Climb this corner, and aim for the Milk Bottle, and from there, you know the rest! This is certainly not the only way to make the traverse, just the easiest I've found.
Essential GearIf you made it to the top of Thunderbolt, you have all the gear you need. If you are not comfortable with short sections of 5th class climbing unroped, then bring along a rope and a little gear. You shouldn't need more than a handful of stoppers. There is very little chance of rockfall on this route, so a helmet is personal choice.
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