Snoqualmie Pass was well known to the Native Americans of the region. Hudson's Bay Company trappers and traders were active in the Snoqualmie and Yakima valleys during the early 19th century. They knew about Snoqualmie Pass but information about their use of it is vague. A possible early use of the pass was that of A.C. Anderson, who drove cattle across the Cascades in 1841, via a pass he called Sinahomish Pass.