I-5 Bridge near the confluence of the American and Sacramento Rivers. The Nisenan Maidu name for the American River was Kum Sayo, meaning Roundhouse River, referring to a structure that the Nisenan Maidu used for dances and other ceremonies. This building was the center of a Maidu community. A particularly large and important roundhouse was located at the mouth of the American River near its confluence with the Sacramento River, in the vicinity of this highway bridge. Other roundhouses could be found all along the American River. The domesticity implied in the Maidu name for the river contrasts with later names applied by European colonists: The River of Sorrows; Wild River (so named because of the ostensibly “wild” nature of the Maidu living there); the River Ojotska (a phonetic rendering of the Russian word for hunter); Rio de los Americanos (named for the American trappers that had begun to use the river).