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The Ogallala Formation is a Miocene to early Pliocene geologic formation in the central High Plains of the western United States and the location of the Ogallala Aquifer. [1] In Nebraska and South Dakota it is also classified as the Ogallala Group . [ 2 ]
Ogallala is a city in and the county seat of Keith County, Nebraska, United States. [3] The population was 4,878 at the 2020 census , up from 4,737 at the 2010 census . In the days of the Nebraska Territory , the city was a stop on the Pony Express and later along the transcontinental railroad .
Its altitude is 3,173 feet (967 m) above sea level. [5] U.S. Route 30 passes through the community, leading west 7 miles (11 km) to Ogallala, the Keith county seat, and east 12 miles (19 km) to Paxton. Nebraska Link 51B leads south 1 mile (1.6 km) across the South Platte River to Interstate 80 at Exit 133.
Enlargeable map of the 50 U.S. states by mean elevation. ... sea level: 41 500 ft ... Panorama Point in Nebraska. 21. Mount Marcy in New York.
The Ogallala Aquifer was formed more than 25,000 years ago, but it recharges at a very low rate. For years, irrigators in Kansas have drained more from the aquifer than rainfall can replace.
The average elevation of the region gradually increases from about 1,800 ft (550 m) in the east to about 3,600 ft (1,100 m) in the west. The Sandhills sit atop the massive Ogallala Aquifer ; thus both temporary and permanent shallow lakes are common in low-lying valleys between the grass-stabilized dunes prevalent in the Sandhills. [ 4 ]
The following is a list of the world's major cities (either capitals, more than one million inhabitants or an elevation of over 1,000 m [3,300 ft]) by elevation.In addition, the country, continental region, latitude and longitude are shown for all cities listed.
It lies along local roads near the North Platte River, 13 miles (21 km) northeast of the city of Ogallala, the county seat of Keith County. [5] Its elevation is 3,100 feet (940 m) above sea level. [6] Although Keystone is unincorporated, it has a post office, with the ZIP code of 69144. [7]