Lower Columbia Gorge

Posted by
Don (Spokane, United States) on 15 June 2013 in Landscape & Rural.

The Columbia River cuts the only sea-level passageway through the Cascade Mountain Range marking the state lines between Oregon and Washington. The wide range of elevation and precipitation makes the Columbia River Gorge an extremely diverse and dynamic place. 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).