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A view through a coulee in Alberta, with steep but lower sides, and water in the bottom. Coulee, or coulée (/ ˈ k uː l eɪ / or / ˈ k uː l iː /), [1] is any of various different landforms, all of which are kinds of valleys or drainage zones. The word coulee comes from the Canadian French coulée, from French couler 'to flow'.
Grand Coulee is two canyons, with an open basin in the middle. The Upper Coulee, filled by Banks Lake, is 25 miles (40 km) long with walls 800 to 900 feet (240 to 270 m) tall. It links to the Columbia River at Grand Coulee Dam and leads southward, through the surrounding highlands. The entry to the coulee is 650 feet (200 m) above the Columbia.
The larger cataract was that of the upper Grand Coulee, where the river roared over an 240 m (800 ft) waterfall. The eroding power of the water plucked pieces of basalt from the precipice, causing the falls to retreat 32 km (20 mi) and self-destruct by cutting through to the Columbia River valley near what is now the Grand Coulee Dam. [9]
The dam at Grand Coulee would someday be mentioned with the Great Pyramids of Egypt, the Great Wall of China and the Panama Canal as one of humankind's greatest achievements.
When it was built, Grand Coulee Dam was the largest dam in the world, but it was only part of the irrigation project. Additional dams were built at the north and south ends of Grand Coulee, the dry canyon south of Grand Coulee Dam, allowing the coulee to be filled with water pumped up from the Columbia River.
Moses Coulee is the second-largest and westernmost canyon of the Channeled Scablands, located about 30 kilometres (19 mi) to the west of the larger Grand Coulee. This water channel is now dry, but during glacial periods, large outburst floods with discharges greater than 600,000 m 3 /s (21,000,000 cu ft/s) carved the channel. [ 1 ]
The Coulee Region is the southwestern part of the Driftless Area in Wisconsin. It is named for its numerous ravines. It is named for its numerous ravines. Never covered by ice during the last ice age , the area lacks the characteristic glacial deposits known as drift .
Dry Falls is a 3.5-mile-long (5.6 km) scalloped precipice with four major alcoves, in central Washington scablands.This cataract complex is on the opposite side of the Upper Grand Coulee from the Columbia River, and at the head of the Lower Grand Coulee, northern end of Lenore Canyon. [1]