He followed the upper Columbia valley north to and past Lake Windermere. At Radium Hot Springs, he turned east and went over Sinclair Pass into the Kootenay River Valley. He recrossed the Kootenay and continued along the reverse of the route pioneered by the Sinclair expedition. He followed the Cross River upstream to its headwaters at Whiteman's Pass. The Cross River was named for the large wooden cross that De Smet erected at the top of the pass, where it could be seen from miles away.