Nisqualli Indians. A Salish tribe on and about the river of the same name flowing into the south extension of Puget Sound, Washington. The Nisqualli Reservation is on the Nisqualli river between Pierce and Thurston counties. The name has also been extended to apply to those tribes on the east side of Puget Sound, speaking the same dialect as the above. Such are the Puyallup, Skagit, Snohomish, Snokwalmu and Stilakwamish. Mitsukwick was a former Nisqualli village. The Nisqualli made a treaty with the United States at Medicine creek, Washington, December 26, 1854, ceding certain lands and reserving others. The Executive order of Jan. 20, 1854, defined the present Nisqualli Reservation.