12 Stat. 945 (1855), 2 Kappler 694
Articles of agreement and convention made and concluded at the treaty ground, Camp Stevens, in the Walla-Walla Valley, this ninth day of June, in the year one thousand eight hundred and fifty-five, by and between Isaac I. Stevens, governor and superintendent of Indian affairs for the Territory of Washington, and Joel Palmer, superintendent of Indian affairs for Oregon Territory, on the part of the United States, and the undersigned chiefs, head-men, and delegates of the Walla- Walla, Cayuses, and Umatilla tribes, and bands of Indians, occupying lands partly in Washington and partly in Oregon Territories, and who, for the purposes of this treaty, are to be regarded as one nation acting for and in behalf of their respective bands and tribes, they being duly authorized thereto; it being understood that Superintendent I. I. Stevens assumes to treat with that portion of the above-named bands and tribes residing within the Territory of Washington, and Superintendent Palmer with those residing within Oregon.
Article I. ...Provided, also, That the exclusive right of taking fish in the streams running through and bordering said reservation is hereby secured to said Indians, and at all other usual and accustomed stations in common with citizens of the United States, and of erecting suitable buildings for curing the same; the privilege of hunting, gathering roots and berries and pasturing their stock on unclaimed lands in common with citizens, is also secured to them.
Treaty with the WallaWalla, Cayuse, Etc., 1855 (1855), https://digitalcommons.law.uw.edu/wa-treaties/2