Mustang Yearling Filly

The Snohomish River Valley was originally inhabited by the Snohomish people, a Coast Salish tribe who lived between Port Gardner Bay and modern-day Monroe. An archaeological site near the confluence of the Snohomish and Pilchuck Rivers has indications of human habitation that began as early as 8,000 years before present. The Snohomish had contact with white explorers in the early 19th century, with their name recorded as "Sinnahamis" by John Work of the Hudson's Bay Company, among the first to also use the name to describe the river. The Snohomish were signatories of the Point Elliott Treaty in 1855, which relocated the tribe to the Tulalip Indian Reservation. In the early 1850s, the territorial government planned to construct a military road connecting Fort Steilacoom to Fort Bellingham, with a ferry crossing of the Snohomish River at Kwehtlamanish, a winter village of the Snohomish people.