In the commencement of this month Pres. Young broke camp at the Elkhorn and started for G.S.L. Valley, with a company consisting of 1,229 souls and 397 wagons. He was followed by Heber C. Kimball's company of 662 souls and 226 wagons, and Willard Richard's company, consisting of 526 souls and 169 wagons. The last wagons left Winter Quarters July 3rd, leaving that place almost destitute of inhabitants.
[source: Jenson, Andrew, Church Chronology]