The Shoshone River was dammed for hydroelectric power and irrigation. It formed when westward-flowing rivers were dammed by an upthrown crustal block. Lakes created by glaciers that dammed small streams were eventually drained, leaving behind fertile terrain. The flow dammed Trout Creek and covered of the White Salmon River valley. The Deschutes River estuary was dammed in 1951 to create Capitol Lake. The Elwha River was dammed in 1910 with construction of the Elwha Dam. Lakes have formed where the glaciers have dammed the heads of valleys. The Wakarusa River was dammed to form Clinton Lake. The River Erne, along with other Donegal waterways, has been dammed to produce hydroelectric power. Every river system has been dammed causing fresh water shortages in nearby desert communities. It has a number of lakes formed by lava flows that dammed up several valleys. Several of Tasmania's largest rivers have been dammed at some point to provide hydroelectricity. The Deschutes River runs through Bend, where it is dammed to form Mirror Pond. At Rutledge Ford the Saluda River was dammed and a power plant constructed. The Yaqui has been dammed with three large reservoirs along its course.