From Cataract Lake, hike south to a saddle just east of the 12,504' marker about a half mile south of the lake. From the saddle, head east on the Colorado Trail briefly, then turn SE, crossing the drainage and heading up on almost all easy tundra-covered slopes to the summit. Return by the same route or drop directly west from the summit to a pass, then turn back to the north on the West Lost Trail Creek trail to rejoin your earlier approach. Some willows.
If accessing this area by Carson Pass, from either Carson Pass, or a half mile to the south from the pass, you want to connect with the Colorado Trail and head west. The trail drops down in elevation some toward Lost Trail Creek, then easily regains elevation to a non-descript, tundra pass that separates the Lost Trail drainage from the Pole Creek drainage. If you're backpacking in, we found a good campsite location about one mile west of this pass in the open tundra, on a bench not far from an overlook of Cataract Lake. See the "Approach" description. Warning: There may be a large herd of domestic sheep grazing in this area.
If approaching from Carson Pass on the Colorado Trail, you could begin an ascent from the broad saddle that divides the Pole Creek drainage from the Lost Trail drainage. Head directly south along an easy, broad ridge, bypassing the 13,552 unranked summit and continuing another 3/4 mile south to the finish. Mostly tundra or chiprock.
If returning from Pole Creek Mtn. to the Colorado Trail, there's a low pass between UN13,580 A and a soft rank summit (13,000 ft.) west of 13,580 A. At that pass, you should connect with a trail coming up out of West Lost Trail Creek. From that pass, you can hike on easy tundra terrain to the summit of UN13,580 A in less than an hour. Return back to the same pass and trail or follow the very broad NW ridge back to the Colorado trail. Mostly tundra & chiprock.
Links to other information, routes & trip reports for this peak that may be helpful.