On the other side of the Great Divide was the British territory of Rupert's Land. From the crest of the pass, streams lead to Spray Lakes above present-day Canmore, Alberta, and the Spray River, which joins the Bow River near modern-day Banff, Alberta. Once in the Bow Valley, De Smet headed upstream and in a north-westerly direction to its source Bow Lake. He traveled further north until he came to the Saskatchewan River, which he followed downstream and east. It was October, and a long cold Canadian winter was looming, when he reached Rocky Mountain House. He had fulfilled one of his main goals; to meet with the Cree, Chippewa, and Blackfoot of the area. At the end of the month, De Smet traveled further to the east to search for more Natives. Fortunate to find his way back to Rocky Mountain House, he was guided by Indians from there to Fort Edmonton, where he spent the winter of 1845–1846.
