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Coulee, or coulée ( or ), 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'.
The term is often used interchangeably in the Great Plains for any of a number of water features, from ponds to creeks.
In southern Louisiana the word coulée (also spelled coolie) originally meant a gully or ravine usually dry or intermittent but becoming sizable during rainy weather. As stream channels were dredged or canalized, the term was increasingly applied to perennial streams, generally smaller than bayous. The term is also used for small ditches or canals in the swamp.
In the northwestern United States, coulee is defined as a large, steep-walled, trench-like trough, which also include spillways and flood channels incised into the basalt plateau.




Types and examples



The dry, braided channels formed by glacial drainage of the Scablands of eastern Washington, such as Grand Coulee and Moses Coulee. Moses Coulee and Lenore Canyon, lower Grand Coulee, have hanging valleys, where pre-flood tributaries enter the coulees at least 100 m (330 ft) above the coulee floor.
The furrowed moraines channeling rain runoff in the area east of the Missouri Coteau in the western United States and western Canada at the base of the Rocky Mountains.
In the western United States, tongue-like protrusions of solidified lava, forming a sort of canyon.
In Wisconsin it is applied to valleys. These valleys tend to have high, steep walls. "Hollow" is used as a synonym, often for the smallest of such valleys. The term is also applied to the greater La Crosse, Wisconsin metropolitan area (i.e. the "Coulee Region").
The Gassman Coulee in North Dakota may have been a contributing factor to the flooding of the Souris River in June 2011.




Geomorphology



Aside from those formed by volcanic eruptions, coulees are commonly canyons characterized by steep walls that have been shaped by erosion. These types of coulees are generally found in the northwestern United States and southwestern Canada. In the American west, rapid melting of glaciers at the end of the last ice age caused catastrophic flooding which removed bedrock by massive down-cutting erosion, forming deep canyons. Some coulees may be seasonally dry or contain small streams, however these small misfit streams do not have the magnitude of force necessary to form such expansive erosion.
In Wisconsin, they are the product of nearly a half million years of erosion, unmodified by glaciation (see Driftless Area). The loose rocks at the base of the wall form what are called scree slopes. These are formed when chunks of the canyon wall give way in a rockslide. Left alone, the valleys are often woodland, with the ridgetops transitioning into tallgrass prairie when not turned into pasture or used for row crops.
Coulees provide shelter from wind and concentrated water supplies to plants which would otherwise struggle to survive in the xeric sagebrush steppe. Trees are often found in riparian habitats along streams in coulees and at the base of their walls.




See also


Channeled Scablands – Landscape in eastern Washington state scoured by cataclysmic floods during the Pleistocene epoch
Grand Coulee – Ancient river bed in the U.S. state of Washington




References

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• Coulee - Wikipedia
• What Is A Coulee In Geography? - WorldAtlas
• Coulee Definition & Meaning - Merriam-Webster
• Two-Minute Takeaway: What Is a Coulee? - The Nature …
• What Is a Coulee? A Geology Lesson From Nick Zentner.
• Coulee - Definition, Meaning & Synonyms | Vocabulary.com
• COULEE Definition & Meaning | Dictionary.com
• Enjoy A Scenic Drive To Grand Coulee Dam In Washington
• coulee - Wiktionary, the free dictionary
• Coulee - definition of coulee by The Free Dictionary

Coulee - Wikipedia

In southern Louisiana the word coulée (also spelled coolie) originally meant a gully or ravine usually dry or intermittent but becoming sizable during rainy weather. As stream channels were dredged or canalized, the term was increasingly applied to …

What Is A Coulee In Geography? - WorldAtlas

Oct 17, 2018 · A coulee refers to different types of landforms. Learn about the formation and characteristics of coulees as well as about famous coulees in the US like Grand Coulee.

Coulee Definition & Meaning - Merriam-Webster

The meaning of COULEE is a small stream.

Two-Minute Takeaway: What Is a Coulee? - The Nature …

Geologically speaking, a coulee is a gully or a ravine that is usually dry and was cut by water action. The term coulee comes from the Canadian French word coulée, derived from the French word couler, meaning “to flow.”

What Is a Coulee? A Geology Lesson From Nick Zentner.

Feb 25, 2024 · Enter the realm of coulees – unique, box-like valleys without rivers, carved into existence by the monumental Ice Age floods. Unlike any valley you’ve seen, these formations boast flat floors, steep walls, and a story that takes us back 14,000 to 28,000 years.

Coulee - Definition, Meaning & Synonyms | Vocabulary.com

A coulee is a gully, stream, or ravine that's full of water. Bring your waterproof boots for the hike — the valley is full of coulees! The meaning of coulee varies regionally. In some places, a coulee …

COULEE Definition & Meaning | Dictionary.com

Chiefly Western U.S. and Western Canada. a deep ravine or gulch, usually dry, that has been formed by running water. a small valley. a low-lying area. a small intermittent stream. Geology. …

Enjoy A Scenic Drive To Grand Coulee Dam In Washington

Aug 23, 2023 · The Scenic Drive To Grand Coulee Dam Is Almost As Beautiful As The Destination Itself. Explore the Coulee Corridor National Scenic Byway in Washington for breathtaking scenery and a visit to the Grand Coulee Dam.

coulee - Wiktionary, the free dictionary

Nov 22, 2024 · coulee Wikipedia A stream, especially one in the western US or Canada, generally smaller than a bayou ; it may (or may not) run dry in summer, may be sluggish, shallow , and wide (forming in effect a pond or slough ), or may have cut a deep gulch or ravine .

Coulee - definition of coulee by The Free Dictionary

Define coulee. coulee synonyms, coulee pronunciation, coulee translation, English dictionary definition of coulee. n. 1. Western US A deep gulch or ravine with sloping sides, often dry in summer. 2. Louisiana & Southern Mississippi a. A streambed, often dry according to...