Ki-a-Kuts Falls is a secluded 40-foot waterfall on the upper Tualatin River in Washington County, Oregon, long hidden by its remote setting, trees, and a river bend. It came to wider attention in July 1993 when hikers from the Tualatin Riverkeepers found it while exploring the river north of Barney Reservoir and then sought its official naming. The final name honored Chief Ki-a-Kuts, the last chief of the Atfalati, a Kalapuya-speaking people of the Tualatin Valley who were devastated by disease and later removed to the Grand Ronde Indian Reservation. Accepted in 1999, the name deliberately linked the landscape with Native history.