From the trailhead, follow the old roadbed/trail into the upper basin. The road starts out close to the creek but gradually gains elevation well above it as you walk up valley. It passes through numerous willows, then some conifers as you get higher. Near 12,200 feet, the road takes a sharp turn to the left and then right again. At this right turn, leave the road and walked across the tundra, crossing the creek, to a small tarn at the foot of a rock glacier coming off UN13,312. A trail leads south up and over a low ridge and then contours SW across the slopes of UN13,312 to a saddle SE of the summit. As it crosses the low ridge, you'll see another unnamed pond about 200 feet below. The same trail intersects the ridge at the saddle at about 12,560 ft. It appears to be a well used game/elk trail. Before this ridge, you could turn up a steep couloir that would shortcut some of the ridge. We emerged on the southeast ridge at about 12,700 ft. Wherever you hit the SE ridge, continue hiking over increasing rocks for the final 600 feet to the summit, encountering no real difficulties anywhere along the route. It took us no more than 3 hours from the trailhead.
From the summit, enjoy an outstanding view into Taylor Park. From here, either return as you came or head on NNW to UN13,090 (unranked) and from there over to Prize BM. More ambitious peakbaggers may want to consider adding UN12,862 (ranked 746) along the ridge to the SSE. It goes at Class 2 with alternating areas of tundra, then embedded rock and sometimes gravel,to the summit.
Links to other information, routes & trip reports for this peak that may be helpful.