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Aquifers of the United States Withdrawal rates from the Ogallala Aquifer.. This is a list of some aquifers in the United States.. Map of major US aquifers by rock type. An aquifer is a geologic formation, a group of formations, or a part of a formation that contains sufficient saturated permeable material to yield significant quantities of water to groundwater wells and springs.
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The Northern Rocky Mountain Intermontane Basins aquifer system is composed largely of unconsolidated sand lying under western Montana, Idaho and a small part of Washington. [2] These shallow aquifers are not connected as a whole, body of water, but narrow glacial deposits unified by a common geologic history.
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The aquifer system is on the Columbia Plateau, contained within the Cascades, Rocky Mountains, Okanogan Highlands, and the Blue Mountains. [1] These aquifers are bounded on the bottom by a layer of Miocene basaltic rock that can be up to 15,000 ft thick. [2] The primary aquifers in the system are shallow, and unconfined. [3]
The Ogallala Aquifer (oh-gə-LAH-lə) is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains in the United States. As one of the world's largest aquifers, it underlies an area of approximately 174,000 sq mi (450,000 km 2) in portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas). [1]