 (also known as the Willamette Valley Treaty or Dayton Treaty) was signed January 4, 1855 and ratified by Congress, on March 3, 1855 (10 Stat.1143).Under the terms of the treaty, the indigenous peoples of the Willamette Valley agreed to remove to a reservation later designated by the federal government as the Grand Ronde reservation in the western part of the Willamette Valley at the foothills of the Oregon Coast Range, sixty miles south of their original homeland.