—more than the Columbia's average discharge—on May 29, 1948. An even larger peak discharge, estimated at , occurred during the flood of June 1894. The river's flow is also measured at several other points in its course. Above Jackson Lake, Wyoming, the discharge is about from a drainage area of . At Minidoka, Idaho, about halfway through the Snake River Plain, the river's discharge rises to . However, at Buhl, Idaho, only about downstream, the river's flow decreases to because of agricultural diversions and seepage. But at the border of Idaho and Oregon, near Weiser at the beginning of Hells Canyon, the Snake's flow rises to after receiving several major tributaries such as the Payette, Owyhee and Malheur. The discharge further increases to at Hells Canyon Dam on the border of Idaho and Oregon. At Anatone, Washington, downstream of the confluence with the Salmon, one of the Snake's largest tributaries, the mean discharge is . History Name The name Snake River comes from the so-called "Snake Indians" who lived along the river, actually Shoshone, Bannock, and Northern Paiute. The "Snake Indian" name for those groups came from Plains Indians—possibly in reference to the use of snake heads in war or because the Plains Indians referred to these groups with a snake-like hand gesture, possibly originally intended to indicate a salmon. Canadian explorer David Thompson first recorded the Native American name of the Snake River as Shawpatin when he arrived at its mouth by boat in 1800. When the Lewis and Clark Expedition crossed westwards into the Snake River watershed in 1805, they first gave it the name Lewis River, Lewis Fork or Lewis's Fork, as Meriwether Lewis was the first of their group to sight the river. The group also learned that the Native Americans called the river or (for an herb that grew prolifically along its banks). Later American explorers, some of whom were originally part of the Lewis and Clark expedition, journeyed into the Snake River watershed and records show a variety of names have been associated with the river. The explorer Wilson Price Hunt of the Astor Expedition named the river as Mad River. Others gave the river names including Shoshone River (after the tribe) and Saptin River. Early inhabitants People have been living along the Snake River for at least 11,000 years. Historian Daniel S. Meatte divides the prehistory of the western Snake River Basin into