Southern High Plains
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| Southern High Plains | |
|---|---|
 Leaflet · CC BY-SA 3.0 · source | |
| Name | Southern High Plains |
| Other name | Llano Estacado (southern portion) |
| Country | United States |
| States | Texas, New Mexico |
| Area km2 | 100000 |
| Highest point | Caprock Escarpment |
| Coordinates | 34°N 102°W |
Southern High Plains The Southern High Plains is a broad plateau region of the United States spanning the eastern New Mexico panhandle and the northwestern Texas Panhandle and South Plains. It forms the southern portion of the Great Plains and includes parts of the Llano Estacado and the Caprock Escarpment, bounded by the Canadian River valley, the Pecos River drainage, and the Red River watershed. The region's landscape, hydrology, and culture link to historic routes such as the Santa Fe Trail, the Butterfield Overland Mail, and the cattle drives that reached terminals at Abilene, Kansas, Dodge City, Kansas, and Fort Worth, Texas.
Geography and Boundaries
The plateau lies within the physiographic provinces recognized in maps by the United States Geological Survey and adjoins the Central Lowland to the east and the Southern Rocky Mountains to the west. Major municipalities located on or near the plateau include Lubbock, Texas, Amarillo, Texas, Clovis, New Mexico, Plainview, Texas, Midland, Texas, and Levelland, Texas. Transportation corridors crossing the plateau include Interstate 40, Interstate 27, U.S. Route 84, U.S. Route 60, and historic rails by the Atchison, Topeka and Santa Fe Railway and the Union Pacific Railroad. The region encompasses parts of county-level jurisdictions such as Hale County, Texas, Lamb County, Texas, Crosby County, Texas, Roosevelt County, New Mexico, and Curry County, New Mexico.
Geology and Soils
The Southern High Plains rests on sedimentary formations deposited during the Cenozoic and Mesozoic eras, including the Ogallala Formation of the Ogallala Aquifer, underlain by Permian and Triassic strata exposed along the Caprock Escarpment and mapped by the United States Geological Survey. Loess and eolian sand mantles create the distinctive stony, calcareous soils classified by the United States Department of Agriculture soil taxonomy as Aridisols and Mollisols common to Post Oak Savannah transition zones; these soils informed agricultural surveys by the Soil Conservation Service. The aquifer supports irrigation wells registered with the Texas Water Development Board and has been the focus of studies by institutions such as Texas A&M University, New Mexico State University, and the Bureau of Reclamation.
Climate
Climatic regimes over the plateau are described in classifications by the Köppen climate classification and monitored by the National Weather Service and the National Oceanic and Atmospheric Administration. Summers are hot and semiarid, influenced by Thunderstorm systems derived from the Gulf of Mexico moisture surge and modulated by El Niño–Southern Oscillation events recorded by the National Climatic Data Center. Winters are variable with periodic Arctic air intrusions traced by the Polar vortex and measured at stations operated by the Weather Bureau. Severe convective storms producing tornadoes and hail are documented in the Storm Prediction Center archive and have affected communities served by emergency agencies such as FEMA.
Ecology and Natural History
Native vegetation historically included mixed-grass prairie dominated by species cataloged in floras at the Smithsonian Institution and herbarium records at Texas Tech University and University of New Mexico. Faunal assemblages include plains ungulates and grassland birds recorded by the Audubon Society, U.S. Fish and Wildlife Service, and regional chapters of the The Nature Conservancy, including species such as the greater prairie-chicken, pronghorn, and migratory sandhill crane pathways. Grassland fragmentation and brush encroachment studies have been conducted by researchers at the United States Department of Agriculture Agricultural Research Service and conservation NGOs like Ducks Unlimited and Pheasants Forever.
Human History and Settlement
Indigenous presence included peoples recorded in ethnographies by the Smithsonian Institution and accounts of tribes such as the Comanche, Kiowa, Apache, and Tonkawa who utilized seasonal bison migrations prior to Euro-American exploration by expeditions like those of Francisco Vásquez de Coronado and scientific surveys of the United States Coast Survey and the Haines Survey. Anglo-American settlement accelerated after the Civil War with ranching enterprises linked to figures and firms like Charles Goodnight and the XIT Ranch, and land policies shaped by the Homestead Act and railroad expansion by lines such as the Southern Pacific Railroad. Twentieth-century developments include New Deal projects administered by the Civilian Conservation Corps and agricultural mechanization promoted by United States Department of Agriculture extension services.
Economy and Land Use
The region's economy centers on irrigated and dryland agriculture—notably cotton, sorghum, and winter wheat—grown under commodity programs overseen by the Farm Service Agency and marketed through cooperatives such as CHS Inc. Energy production includes oil and gas extraction licensed by state agencies like the Texas Railroad Commission and New Mexico Oil Conservation Division, along with wind energy projects connected to transmission operated by entities such as Electric Reliability Council of Texas and Southwest Power Pool. Urban economies in Lubbock, Texas and Amarillo, Texas feature universities—Texas Tech University, West Texas A&M University—and medical centers such as University Medical Center (Lubbock) that serve regional healthcare networks accredited by bodies like the Joint Commission.
Conservation and Environmental Issues
Environmental management concerns involve depletion and recharge of the Ogallala Aquifer documented in reports by the High Plains Underground Water Conservation Districts and federal assessments by the United States Geological Survey and the Environmental Protection Agency. Conservation initiatives by The Nature Conservancy, state wildlife agencies like the Texas Parks and Wildlife Department and the New Mexico Department of Game and Fish, and federal programs such as the Conservation Reserve Program address grassland restoration, playa lake protection, and wildlife corridors. Policy debates engage stakeholders including agricultural associations like the American Farm Bureau Federation, tribal governments such as the Comanche Nation, and research institutions like the USDA Agricultural Research Service and Texas A&M AgriLife Research.