The Umatilla and Yakama tribes ceded the land Kennewick sits on at the Walla Walla Council in 1855. Ranchers began working with cattle and horses in the area as early as the 1860s, but in general settlement was slow due to the arid climate. Ainsworth became the first non-Native settlement in the area—where U.S. Route 12 now crosses the Snake River between Pasco and Burbank. Some Ainsworth residents would commute to what is now Kennewick via small boats for work. All that remains of Ainsworth is a marker placed by the Washington State Department of Transportation near the site.
