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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.
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 Dam is the largest producer of hydroelectric power in the United States, [1] generating 6,809 megawatts, over one-sixth of all power in the basin. In addition to providing ample power for the people of the Pacific Northwest , the reservoirs created by the dams have created numerous recreational opportunities, including fishing ...
Banks Lake (1951) is an artificial impoundment in the Upper Grand Coulee. It is 27 miles (43 km) long and 1 to 3 miles (1.6 to 4.8 km) wide. The coulee has nearly vertical rock walls up to 600 feet (180 m) high. North Dam on Banks Lake with Feeder Canal
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 .
As the Okanogan lobe melted, the upper portions of Moses Coulee were littered with clear evidence of its passing in the Withrow Moraine. The glacier left behind a blanket of glacial till, up to 50 feet (15 m) thick in places. This glacial till, made up of clay, silt, sand, gravel, cobblestones, and erratic boulders, covers most of the upper coulee.
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]
The Narrows: Located between Upper Arrow Lake and Lower Arrow Lake, where the Columbia's water flowed swiftly as a river for about 14 miles (23 km); [66] centered at The lower, southern end of The Narrows, where the river emptied into Lower Arrow Lake, was located at Burton near Cariboo Creek, 49°59′N 117°55′W / 49.983°N 117.917 ...