This trail climbs from the Trapper Creek trailhead through an old-growth forest to views of the many mountains of the South Cascades from Observation Peak. Some portions of the trail were burned in the Big Hollow Fire in 2020.
Shortly after beginning your hike, your route crosses the Dry Creek Trail. At the first junction near the wilderness boundary, take a right onto the Observation Trail.
Stay left, and continue hiking through old-growth forest, along babbling brooks in quiet forest for 5.1 miles to the summit of Observation Peak.
It's possible to make this hike a loop by following the Observation Peak trail around the summit of the peak and back down the way you came, rejoining the Trapper Creek Trail a mile from the trailhead.
If you opt to do this, your total mileage will be 10.5 miles.