This trail starts at the Middle Boulder Trailhead on Forest Road 40N17 and follows along the east side of West Boulder Creek for about 1.2 miles to a junction with the Telephone Lake Trail #5576. From here it continues on upslope parallel to, but not near, an unnamed branch of the creek. At about 2.2 miles from the trailhead, it crosses a moist meadow area north of Middle Boulder Lake. If you want to visit the lake, leave the trail here and go cross-country over a small rise to the lake.<br><br>If you're continuing on, you'll pass a poorly signed junction with the Boulder Tie Trail #5582 at about 2.5 miles from the trailhead. Past here, the #5577 leaves the trees behind and makes a sweeping climb over open ground to end at its junction with the Pacific Crest Trail on the crest of the Scott Mountains.
Just north of the junction with the Middle Boulder Lake Trail
Descending the Middle Boulder Trail
Middle Boulder Lake from the PCT