The trailhead to the Bald Eagle Trail is south of Darrington on the Mountain Loop Highway. Follow the road 16.9 miles to Sloan Creek Road #49, which is where you will turn left. It's then another 8.5 miles to the junction with Cadet Creek Road #4920, which will be on your right. Take a right onto Cadet Creek Road #4920 and follow it 0.5 mile. Look for the trailhead just before Sloan Creek.
The national forest website reports that this trail provides access to the Glacier Peak Wilderness area and the Pacific Crest Trail at Dishpan Gap. It exits from scenic Pride Basin and crosses a previously cleared out area. From there, the trail goes back into the forest. Along the way are aging puncheon bridges broken in places making poor footing for horses and pack animals.
A distance away it opens into a vast corridor of meadows called Curry Gap.
Follow the trail south through Curry Gap until you come to a junction. The Quartz Creek Trail #1050 is the right fork, and will connect with the North Fork Skykomish Road #63 / Skykomish District. The left fork of the junction, however, traverses along the ridge and nearly passes over Bald Eagle, Long John and June mountains. Eventually it reaches the Pacific Crest Trail at Dishpan Gap at a distance of over 9.5 miles in total.
The national forest website states that a Northwest Forest Pass is required for each vehicle parked at the trail head.