 Complete the following phrase:  Later in the 1847 trek, Harmon was left with 9 other men to construct and operate a ferry across the North Platte river located near present-day Casper, Wyoming. After settling in Salt Lake City in 1848 he prospered, living in downtown Salt lake city, building one of the first sawmills and farming near the present location of Sugar House Park. Harmon kept detailed journals of his trek west and his 1850-1853 mission to England that have been published. On the trail heading east for his missionary service in 1850, he saw throngs of gold miners heading west in the second year of the California gold rush, and he was an eye-witness to, and a survivor of, the tragic cholera epidemic that decimated the participants. In 1851 he visited the famous 