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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).
The Great Basin physiographic section is a geographic division of the Basin and Range Province defined by Nevin Fenneman in 1931. [6] The United States Geological Survey adapted Fenneman's scheme in their Physiographic division of the United States. [7] The "section" is somewhat larger than the hydrographic definition.
U.S. Route 20 or U.S. Highway 20 ( US 20) is an east–west United States Numbered Highway that stretches from the Pacific Northwest east to New England. The "0" in its route number indicates that US 20 is a major coast-to-coast route. Spanning 3,365 miles (5,415 km), it is the longest road in the United States, [1] and, in the east, the route ...
U.S. Highway 285 US 285 highlighted in red Route information Auxiliary route of US 85 Maintained by CDOT Length 263.87 mi (424.66 km) Major junctions South end US 285 at the New Mexico state line Major intersections US 160 in Monte Vista US 50 in Poncha Springs US 24 in Johnson Village US 85 in Sheridan North end I-25 SH 30 in Denver Location Country United States State Colorado Counties ...
One of the largest aquifers in the Western United States. The state of Washington has numerous large aquifers, as shown in this map of the Hydrogeology of Washington State. Spokane Valley–Rathdrum Prairie Aquifer [6] covers 325 square miles (842 km 2) in eastern Washington and Idaho. It provides drinking water for some 700,000 people.
Route description. US 191 in Montana begins at the West Entrance to Yellowstone National Park concurrent with US 20 and US 287, at the edge of the town of West Yellowstone. Some commercially produced maps show US 191 going through Yellowstone National Park; however, it officially has a gap inside the park and resumes in Wyoming at the South ...
The U.S. Interior Highlands is a mountainous region in the Central United States spanning northern and western Arkansas, southern Missouri, eastern Oklahoma, and extreme southeastern Kansas. The name is designated by the United States Geological Survey to refer to the combined subregions of the Ouachita Mountains south of the Arkansas River and ...
The inland and intracoastal waterways of the eastern United States. The inland waterways of the United States include more than 25,000 mi (40,000 km) of navigable waters. Much of the commercially important waterways of the United States consist of the Mississippi River System —the Mississippi River and connecting waterways.