From the Timber Mountain Trail, look for the trailhead for the Buck Mountain Trail on the north side of the trail. From thre the trail passes by Divide Lake. Enjoy the view before continuing to head out the ridge towards Buck Mountain and Iron Mountain on Trail #176.
Follow the awesome ridge and side hill trail that was recently improved. Follow this up and around a few summit and past a small mud lake and a trail on your left marked with a very old sign that says "water" and an arrow down the hill. This is trail 155/515. Past this junction, continue out along the ridge for several more miles on a steady descent until the trail ends at a junction with a dirt road.