Old Pierre is a massive triple peak on the Pitt-Stave divide, on the east side of upper Corbold Creek. There are glaciers on the north flank and to the south. Access is by boat to the head of Pitt Lake, then by logging roads along Corbold Creek. Cross the pass west of Remote Peak and then head north across a glacier to reach the south side of Old Pierre Mountain. Ascend the southeast ridge, a Class 3 route on rotten rock.