The Chehalis, including the Upper Chehalis (Kwaiailk), Lower Chehalis, Copalis, Cowlitz, Humptulip, Oyhut, Satsop, and Shoalwater Salish, lived in southeastern Washington along the Chehalis, Satsop, and Cowlitz rivers. They spoke Halkomelem languages of the Coast Salish division and numbered 382 in 1984. They were living among the Chinook on the Chehalis and Shoalwater Indian Reservations.
Haeberlin, Hermann, and Erna Gunther (1930). The Indians of Puget Sound. University of Washington Publications in Anthropology, 4(1). Seattle.
Marr, Carolyn J., Donna Hicks, and Kay Francis (1980). The Chehalis People. Oakville, Wash.: Confederated Tribes of the Chehalis Reservation.