From Hurricane Creek trailhead, follow Hurricane Creek Trail approximately 2 1/2 miles to Thorp Creek trail. Thorp Creek trail is not shown on the USFS maps, but it is shown on the USGS Chief Joseph Mtn quadrangle. Cross Hurricane Creek (there were crossable logs upstream of horse crossings when we did route). Go through a grassy meadow on the east side of Hurricane Creek and find the trail.
Follow Thorp Creek trail approximately 5 miles to a cirque between Hurwal Divide and Sacajawea Peak. There are numerous places to camp in this valley.
Go upstream along Thorp Creek until it turns west into a higher scree-filled cirque. The creek goes through a gap at the bottom of this cirque. Gain the ridge leading north at this gap. Stay on the ridge as swings to the west. Sacajawea's steep north face will be immediately on your right. As the ridge loses definition high up, traverse the upper slopes on the left to gain the summit ridge. This ridge leads southwest to the summit.
The route is non-technical, but is steep and gravelly in places. Trekking poles are useful on this terrain. There is no water above Thorp Creek.
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