![]() ![]() In the western, temperate rainforest areas, forests are marked by bigleaf maples, Douglas fir, and western hemlock, all covered in epiphytes. The gorge transitions between temperate rainforest to dry grasslands in only 80 miles (130 km), hosting a dramatic change in scenery while driving along Interstate 84. Isolated micro-habitats have allowed for many species of endemic plants and animals to prosper, including at least 13 endemic wildflowers. Ranging from 4,000 feet (1,200 m) to sea level, and transitioning from 100 inches (2,500 mm) of precipitation to only 10 inches (250 mm) in 80 miles (130 km), the gorge creates a diverse collection of ecosystems, from the temperate rain forest on the western end-with an average annual precipitation of 75 to 100 inches (1,900 to 2,500 mm)-to the eastern grasslands with average annual precipitation between 10 and 15 inches (250 and 380 mm), to a transitional dry woodland between Hood River and The Dalles. The Columbia River Gorge marks the state line between Oregon and Washington, and its wide range of elevation and precipitation makes it an extremely diverse and dynamic place. Each river has created a gorge through the Cascades. The Columbia River, Klamath River in northern California, Pit River in northern California, and Fraser River in southern British Columbia are the only four rivers connecting the watersheds on the east side of the Cascade Range to the Pacific Ocean. Route 30, Washington State Route 14, and railroad tracks on both sides run through the gorge.Ī popular recreational destination, the gorge holds federally protected status as the Columbia River Gorge National Scenic Area and is managed by the Columbia River Gorge Commission and the U.S. It is thus that the routes of Interstate 84, U.S. Extending roughly from the confluence of the Columbia with the Deschutes River (and the towns of Roosevelt, Washington, and Arlington, Oregon) in the east down to the eastern reaches of the Portland metropolitan area, the water gap furnishes the only navigable route through the Cascades and the only water connection between the Columbia Plateau and the Pacific Ocean. Up to 4,000 feet (1,200 m) deep, the canyon stretches for over eighty miles (130 km) as the river winds westward through the Cascade Range, forming the boundary between the state of Washington to the north and Oregon to the south. The Columbia River Gorge is a canyon of the Columbia River in the Pacific Northwest of the United States. Looking east up the Columbia River Gorge from near Multnomah Falls. ![]()
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