[Three days before the pioneer company enters Salt Lake Valley]
Erastus Snow was with the vanguard company of Mormon pioneers led by Brigham Young. On 21 July 1847 Snow and Orson Pratt, alternately riding a single horse and walking, followed the Donner Party trail over Little Mountain and down Emigration Canyon, and they were the first of the Mormon pioneers to enter Salt Lake Valley.
[Snow writes in his journal: "From the view we had of the valley from the top of the mountain, we supposed it to be only an arm of prairie extending up from the Utah valley, but on ascending this butte we involuntarily, both at the same instant, uttered a shout of joy at finding it to be the very place of our destination, and beheld the broad bosom of the Salt Lake spreading itself before us."]
[Source: Utah History Encyclopedia: Erastus Snow, http://www.uen.org/utah_history_encyclopedia/]