Unknown Stream

From the true right of the Wilberforce River, cross to the true left of Unknown Stream where it abuts bluffs and follow it along the straightforward lower reaches. About 4 km beyond Unknown Hut the river forks, the northern branch draining Unknown Col and the south branch draining a rugged section of the Rolleston Range. Travel up the north branch follows a narrow valley, subject to rock fall, which has three waterfalls part way up. Negotiating the third waterfall requires a rock climb on the true right. This waterfall has turned some parties back and a rope may be needed. In early season the waterfalls are buried in avalanche debris and travel is straightforward.