DESCRIPTION: From the trailhead, the trail runs down to a crossing of the Kachess River. From there it climbs 0.25 mile to the junction with Little Kachess Trail 1312. 1331 turns right and goes up through old-growth forest on an old mining road. The trail passes an old mine (end of the mining road) site at approximately 1.3 miles and soon after crosses Mineral Creek. Just past the crossing is the wilderness boundary. The trail runs above the creek and passes through several large brushy avalanche clearings and patches of forest. At approximately 4 miles, the trail crosses a creek and begins to climb steeply through forest towards Upper Park Lake. Near the lake, the trail levels off in an area of trees, meadows, and rolling hills called Park Lakes Basin (no campfires are allowed in the basin) and continues upward towards its junction with the Pacific Crest Trail.
PARKING AND FACILITIES: A small roadside parking lot.
TRAILHEAD ACCESS: From Cle Elum and/or Roslyn, take state highway 903 north past Lake Cle Elum and turn left onto Road 4600 (Cooper Lake Road). Continue on 4600 past the Cooper Lake turnoff and on to Cooper Pass. Stay on 4600 (the main road) and drive approximately 3 miles (from the pass) to the bottom of the valley and the signed trailhead.