On June 10th, 1842, J. C. Fremont left St. Louis to explore the Wind River Mountains, with Kit Carson as guide, Charles Preuss, topographer, L. Maxwell, hunter, and 20 Canadian voyageurs, including Basil LaJeunesse. Eight two-wheeled mule-drawn carts were used as far as the Platte River. The party crossed South Pass August 8th and camped here at "Two Buttes" August 9th. Leaving 10 men at Boulder Lake, the lieutenant ascended Fremont Peak August 15th, stayed here again August 17th, and on the 19th re-crossed South Pass. So ended Fremont's exploration of the Wind River Mountains and his stay in Sublette County.