River, southwest of Biggs Junction and from the Columbia's mouth on the Pacific Ocean. Tributaries Named tributaries of the Deschutes River from source to mouth include Snow Creek then the Cultus River, Cultus Creek and Deer Creek, which enter at Crane Prairie Reservoir. Further downstream come the Fall River, the Little Deschutes River, and the Spring River followed by Tumalo Creek and Whychus Creek. The Metolius River and the Crooked River are next, both entering at Lake Billy Chinook. Then come Seekseequa Creek and Willow Creek followed by Dry Hollow and Campbell, Shitike and Trout creeks, after which comes the Warm Springs River. Further downstream are Swamp, Skookum, Oak, Antoken, Cove, Eagle, Nena, Wapinitia and Bakeoven creeks. Spring Creek is next, followed by Oak Springs Creek and the White River. Below that are Winterwater and Elder creeks. History Prior to 80,000 years ago, the river ran along the east side of Pilot Butte and a lava flow from Lava Top Butte filled in this ancient channel. Previously, the basalt of the Bend lava flow, associated with the Lava River Cave, had diverted the river westward to its present-day location. The river was named Rivière des Chutes or Rivière aux Chutes, French for River of the Falls, during the period of fur trading. The waterfall it referred to was the Celilo Falls on the Columbia River, near where the Deschutes flowed into it. (These falls no longer exist, having been inundated by the lake behind The Dalles Dam). Lewis and Clark encountered the river on October 22, 1805, and referred to it by the Native American name Towarnehiooks; on their return journey they gave it the new name Clarks River. Variant names include Clarks River, River of the Falls, Riviere des Chutes, Chutes River, and Falls River. During the middle 19th century, the river was a major obstacle for immigrants on the Oregon Trail. The major crossing point on the river was near its mouth in present-day Deschutes River State Recreation Area. Many immigrants camped on the bluff on the west side of the river after making the crossing. The remains of the trail leading up to the top of the bluff are still visible. In 1910, Mirror Pond was created by the construction of the Bend Water, Light & Power Company dam on the river in Bend. The dam provided the city with its initial source of electricity. The dam