Idaho was one of the last areas in the lower 48 states of the US to be explored by people of European descent. The Lewis and Clark expedition entered present-day Idaho on August 12, 1805, at Lemhi Pass. It is believed that the first European descent expedition to enter southern Idaho was by a group led in 1811 and 1812 by Wilson Price Hunt, which navigated the Snake River while attempting to blaze an all-water trail westward from St. Louis, Missouri, to Astoria, Oregon. At that time, approximately 8,000 Native Americans lived in the region.