|Southwestern United States|
Northwest escarpment of the Llano Estacado
|States||New Mexico, Texas|
|- elevation||1,500 m (4,921 ft)|
|- elevation||910 m (2,986 ft)|
|Length||400 km (249 mi)|
|Width||240 km (149 mi)|
|Area||97,000 km2 (37,452 sq mi)|
Shaded relief image of the Llano Estacado. The escarpments marking the eastern edge of the Llano are visible, running roughly in a north-south line through the middle of the Panhandle. The western edge is on the New Mexico side of the border, with the Texas-New Mexico border running considerably closer to the western edge of the Llano than to the eastern.
Llano Estacado (Spanish: ['?ano esta'kaðo]), often translated as Staked Plain, is a region in the Southwestern United States that encompasses parts of eastern New Mexico and northwestern Texas. One of the largest mesas or tablelands on the North American continent, the elevation rises from 3,000 feet (900 m) in the southeast to over 5,000 feet (1,500 m) in the northwest, sloping almost uniformly at about 10 feet per mile (1.9 m/km).
The Llano Estacado lies at the southern end of the Western High Plains ecoregion of the Great Plains of North America; it is part of what was once called the Great American Desert. The Canadian River forms the Llano's northern boundary, separating it from the rest of the High Plains. To the east, the Caprock Escarpment, a precipitous cliff about 300 feet (100 m) high, lies between the Llano and the red Permian plains of Texas; while to the west, the Mescalero Escarpment demarcates the edge of the Pecos River valley. The Llano has no natural southern boundary, instead blending into the Edwards Plateau near Big Spring, Texas. This geographic area stretches about 250 miles (400 km) north to south, and 150 miles (240 km) east to west, a total area of some 37,500 square miles (97,000 km2), larger than Indiana and 12 other states. It covers all or part of 33 Texas counties and four New Mexico counties. Some years, a National Weather Service dust storm warning is issued in parts of Texas due to a dust storm originating from the area or from the adjacent lower part of the Southwestern Tablelands ecological region. The landscape is dotted by numerous small playa lakes, depressions that seasonally fill with water and provide habitat for waterfowl.
The Llano Estacado has a "cold semiarid" climate (Köppen BSk), characterized by long, hot summers and cold winters. Rainfall is very low; the entire region receives fewer than 23 in (580 mm) of rainfall annually, and the western part receives as little as 14 in (360 mm). High summer temperatures (average July temperature above 90 °F or 32 °C) mean most of the small amount of precipitation is lost to evaporation, making dryland farming difficult.
The Texas State Historical Society states it covers all or part of 33 Texas counties, six fewer than as depicted by a US Geological Survey map, and four New Mexico counties.
It also includes all or part of the following New Mexico counties:
Several interstate highways serve the Llano Estacado. Interstate 40 crosses the northern portion from east of Amarillo to Tucumcari, New Mexico. Interstate 27 runs north-south between Amarillo and Lubbock, while Interstate 20 passes through the southern portion of the Llano Estacado west of Midland and Odessa.
I reached some plains so vast, that I did not find their limit anywhere I went, although I traveled over them for more than 300 leagues ... with no more land marks than if we had been swallowed up by the sea ... there was not a stone, nor bit of rising ground, nor a tree, nor a shrub, nor anything to go by.
In the early 18th century, the Comanches expanded their territory into the Llano Estacado, displacing the Apaches who had previously lived there. The region became part of the Comancheria, a Comanche stronghold until the final defeat of the tribe in the late 19th century. The Comanche war trail extended from Llano Estacado to the Rio Grande into Chihuahua, "the trail ran southwesterly through Big Spring to the Horsehead Crossing of the Pecos River, then forked southward to the Comanche Springs where it divided, one part of the trail crossing the great river near Boquillas and the other at Presidio.":122
Robert Neighbors and Rip Ford, guided by Buffalo Hump, blazed the "upper route" trail from San Antonio to El Paso in 1849 for emigrants during the California Gold Rush, "...travelling across an elevated plateau almost covered by rock...":114 and 121
After his 1852 expedition to explore the headwaters of the Red and Colorado Rivers, General Randolph Marcy wrote: "[not] a tree, shrub, or any other herbage to intercept the vision... the almost total absence of water causes all animals to shun it: even the Indians do not venture to cross it except at two or three places." In his report for the United States Army:
When we were upon the high table-land, a view presented itself as boundless as the ocean. Not a tree, shrub, or any other object, either animate or inanimate, relieved the dreary monotony of the prospect; it was a vast-illimitable expanse of desert prairie .... the great Sahara of North America. it is a region almost as vast and trackless as the ocean--a land where no man, either savage or civilized permanently abides ... a treeless, desolate waste of uninhabitable solitude, which always has been, and must continue uninhabited forever.
During the 1854 Marcy-Neighbors expedition, Dr. George Getz Shumard noted, "Beyond the mountain appeared a line of high bluffs (the Llano Estacado) which in the distance looked like clouds floating upon the horizon.":145
Robert G. Carter described it in 1871 while pursuing Quanah Parker with Ranald S. Mackenzie, "...all were over and out of the canyon upon what appeared to be a vast, almost illimitable expanse of prairie. As far as the eye could reach, not a bush or tree, a twig or stone, not an object of any kind or a living thing, was in sight. It stretched out before us-one uninterrupted plain, only to be compared to the ocean in its vastness."
William "Billy" Dixon, described the area while buffalo hunting in June, 1874, "All of us hunters acquainted with the habits of the buffalo knew that the herds would soon be coming north from the Staked Plains region where they had spent the winter...moved by that strange impulse that... caused them to change their home and blacken the Plains with their countless, moving forms."
In author Zane Grey's 1925 novel, The Thundering Herd, Grey offers the following explanation for the name Llano Estacado: "Thet name Llano Estacado means Staked Plain," said the Texan. "It comes from the early days when the Spanish Trail from Sante Fe to San Antone was marked by 'palos,' or stakes. There was only two trails across in them days an' I reckon no more now. Only the Indians know this plain well an' they only run in heah to hide awhile. Water an' grass are plentiful in some parts, an' then there's stretches of seventy miles dry an' bare as a bone."
In the latter part of the 19th century, the Llano was a refuge for the bands of Kiowas and Comanches who did not wish to be confined to reservations in Indian Territory, in present-day Oklahoma. One of their last battles against the US Army was fought on 28 September 1874 in the Battle of Palo Duro Canyon.
Charles Goodnight in describing what it takes to be a scout, "...the trained ear should be able to tell the sound, whether it was made by man or beast or bird...as a human voice echoes more than all others...of course, on the Staked Plains we have not this advantage as there is nothing to create an echo."
Today, most of the area's population is localized in the principal cities of Amarillo, Lubbock, Midland and Odessa, Texas. The vast majority of the area is rural, covered by large ranches and irrigated farms. Several small- to medium-sized towns do exist, however, including Andrews, Hereford, Plainview, Levelland, and Lamesa, Texas, and Clovis, Portales, and Hobbs, New Mexico.
The Llano Estacado is slightly larger in area than the state of Indiana. The southern extension of the High Plains, the region is some 250 miles north to south and 200 miles east to west. The roads are straight and meet mostly at right angles. Cotton is an essential crop with irrigation, but faces declining prices at times on the world market. The Llano Estacado is sometimes humorously described as "85 percent sky and 15 percent grassland."
Notable lawmakers include George H. Mahon, Kent Hance, and Robert L. Duncan. The area has a large number of churches per capita. Lubbock, known for a wide variety of denominations, also holds the distinction of being the most populous city on the High Plains from the Dakotas through Texas. Prohibition did not end on the Texas Plains in 1933 with repeal of the Eighteenth Amendment to the United States Constitution, but continued for years at the county level. Even in 2010, some forty Texas counties, most in the Llano Estacado, remain officially "dry" to the sale of alcoholic beverages.
Map of Texas counties with population density
Lubbock, Texas, the largest city on the Llano
A shot of downtown Amarillo, Texas
Midland, "The Tall City" of West Texas
"The 'Staked Plains' tale is deeply entrenched in Texas mythology, but the real interpretation of Llano Estacado is sensible geologic: it means 'stockaded' or 'palisaded' plains - which is precisely how the edge of the plains appear when viewed from below the caprock.":355
The Ogallala formation is a wedge of sediments built up eastward of the Rocky Mountains as they were uplifted in the Miocene, with the consequent alluvial fans referred to as the "Gangplank".:356 The Ogallala Aquifer is the main freshwater source for the region and consists of braided stream deposits filling in valleys during humid climatic conditions, followed by a sub-humid to arid climate and thick eolian (wind-blown) sand and silt.:356Caliche layers cap the Ogallala, which reflect today's arid conditions.:356Pleistocene rainfall over the flat terrain caused water to pond at the surface, resulting in a High Plains characteristic, innumerable round ponds called playa lakes.:357 Spearing goes on to say,
When the weather is dry, they are dusty, round, gray, usually unvegetated flats, as observed from the highway. But after a High Plains thunderstorm, water quickly fills the ponds, only later soaking into the underlying porous sandstones just below the surface to add to the groundwater in the Ogallala aquifer. Early pioneers depended dearly on water from these surface ponds for themselves and their livestock, considering how few streams are on the High Plains. But rains didn't always come, and the ponds dried up frequently. The 20th century has witnessed a concerted effort to tap the more reliable Ogallala water sands. Predictably, the consequent high dependency on groundwater has removed more water than is naturally replaced, raising concern for Panhandle citizens and planners as to future water supplies.:357
The Pecos and Canadian rivers have eroded the Llano Estacado region down to the Triassic and Permian redbeds resulting is a distinctive color contrast besides separating it from source rocks in the Rocky Mountains.
The economy of the Llano Estacado is predominantly agricultural, with farming of various crops prevalent, as is cattle ranching. Oil and gas production is also prevalent on the Llano Estacado.
Overuse of the aquifer in the past has persuaded some farmers to return to dryland crops, leading to less rainwater reaching the playas.
"Cotton, grain sorghum, corn, wheat, peanuts, sunflowers, grapes, vegetables, and cattle produced in the region literally go around the world. Their economic impact on our area is in the billions of dollars...and the availability of water is a key factor influencing the region's agribusiness economy."
One of the largest economic drivers on the Llano Estacado is in energy production, with the region experiencing significant activity for producing oil and natural gas associated with the Permian Basin. Additionally, wind farms have proliferated on the Llano Estacado due to the region's windy climate making it a favorable location for the production of wind energy.