Big Bend National Park is a United States national park located in West Texas, near the border with Mexico. The park is important because it is the largest protected area in the United States that shows the special land shapes and living things of the Chihuahuan Desert. The park was named for a large curve in the Rio Grande/Río Bravo river. The park protects more than 1,200 kinds of plants, more than 450 kinds of birds, 56 kinds of reptiles, and 75 kinds of mammals. Activities in the park include driving scenic roads, learning from Big Bend park rangers, and watching stars in the night sky.
The area has a long history of human activity, including ancient archaeological sites that are almost 10,000 years old, as well as more recent groups like pioneers, ranchers, and miners. The Chisos Mountains are inside the park and are the only mountain range in the United States that is completely within a national park. The park has geological features such as fossils from ancient seas, dinosaur bones, and volcanic rock formations.
Big Bend National Park covers 801,163 acres (about 1,250 square miles or 3,242 square kilometers) and is entirely within Brewster County. The Rio Grande/Río Bravo river forms part of the border between the United States and Mexico for more than 1,000 miles (1,600 kilometers), and Big Bend National Park manages about 118 miles (190 kilometers) of that border.
Because the Rio Grande is an international border, the park has special challenges in managing its rules and policies. According to the Treaty of Guadalupe Hidalgo, the park’s land only extends to the middle of the deepest river channel as it was in 1848. The rest of the river and the land south of it belong to Mexico. The park is next to protected areas in Mexico called Cañón de Santa Elena and Maderas del Carmen.
Geography and climate
Big Bend National Park is located in an area of Brewster County, Texas, that is not part of a city.
According to the Köppen climate classification system, the park has a hot arid climate (BWh).
The park has very different conditions, and its climate is known for extreme temperatures. In the lower areas, summer days can be very hot, often reaching over 100 °F (38 °C). Winters are usually mild, but sometimes temperatures drop below freezing. The park’s elevation ranges from about 1,800 feet (550 m) near the river to 7,832 feet (2,387 m) at Emory Peak in the Chisos Mountains. This wide range in height causes large differences in temperature and moisture across the park. These differences create many types of plant and animal habitats. Some plants, like the Chisos oak (Quercus graciliformis), are only found in this park in the United States.
The southern boundary of the park includes 118 miles (190 km) of the Rio Grande river, which forms the canyons of Santa Elena, Mariscal, and Boquillas. The Rio Grande flows through this part of the Chihuahuan Desert and has carved deep canyons with nearly vertical walls through three rock formations made mostly of limestone. In the open desert areas, the area along the river supports many plants and animals, as well as important cultural resources. This plant-covered area extends into the desert along streams and dry riverbeds.
The Chisos Mountains in the park are called "sky islands" because they are surrounded by desert. A large part of the park’s rich variety of life is found in the Chisos Mountains and in many desert springs across the park.
To the south of the park are the Mexican states of Chihuahua and Coahuila. These areas include newly protected places that help protect plants and animals, such as Maderas del Carmen and Cañón de Santa Elena.
History
During the early historic period (before 1535), several Native American groups lived in the Big Bend area. The Chisos Indians were a loosely organized group of nomadic hunters and gatherers who may have grown some crops seasonally. Their origins are unknown, but they spoke a language related to the Uto-Aztecan language family, which was spoken by people from central Mexico to the Great Basin in the United States. They were also connected linguistically to the Conchos Indians of northern Chihuahua and northwestern Coahuila.
The Jumano were a nomadic group that traveled and traded across West Texas and southeastern New Mexico. Some records suggest they were enemies of the Chisos. Around the start of the 18th century, the Mescalero Apaches moved into the Big Bend region and forced the Chisos to leave. Later, the Comanche passed through the area along the Comanche Trail during raids into Mexico. These raids continued until the mid-1800s. One of the last important leaders of the region’s Native peoples was an Apache of Spanish descent named Alzate, who was active as late as the 1860s.
European explorers first arrived in the Big Bend area around 1535. Spanish explorers, including Álvar Núñez Cabeza de Vaca, traveled near the region, followed by other expeditions. Some sought gold, silver, or farmland, while others, like Franciscan missionaries, aimed to spread their religion to Native peoples. In the late 18th century, Spain built a series of forts along the Rio Grande to protect its northern frontier, which later became Mexico. These forts, called presidios, included the Presidio de San Vicente near present-day San Vicente, Coahuila, and the Presidio de San Carlos near present-day Manuel Benavides, Chihuahua. Some forts were abandoned due to financial problems and the inability to stop Native attacks. Soldiers and settlers moved to other forts where Spain’s interests were more secure, such as Santa Rosa Maria del Sacramento, now known as Muzquiz, Coahuila.
Little is known about Spanish activity in the Big Bend after the forts were abandoned. In 1805, a Spanish settlement called Altares existed 30 miles south of the Rio Grande. The region became part of Mexico in 1821 when Mexico gained independence from Spain. Mexican families lived there when English-speaking settlers arrived in the latter half of the 19th century, following Texas’s secession.
After the Mexican-American War ended in 1848, the U.S. Army surveyed the Big Bend area to protect settlers from Native attacks. Forts and outposts were built across Trans-Pecos Texas. Many soldiers in the late 1800s were African American and were called “buffalo soldiers” by Native peoples. Lieutenant Henry Flipper, the first African American to graduate from West Point, served in Shafter, Texas, near the end of the 19th century. Ranchers began settling in the Big Bend around 1880, and by 1900, most of the area was used for sheep, goat, and cattle ranches. Overgrazing damaged the desert environment.
In the late 1800s and early 1900s, valuable minerals were discovered, leading to mining operations. Communities like Boquillas and Terlingua formed around these mines. Farmers also settled along the Rio Grande floodplain, creating small towns such as Terlingua Abajo, San Vicente, La Coyota, and Castolon. These settlements were often small clusters of families who relied on the land for survival.
In May 1916, a raid at Glenn Springs gained national attention and led President Wilson to send the Texas National Guard to the border. A permanent cavalry camp was built at Glenn Springs in 1916 and remained until 1920, when the border situation improved.
In the 1930s, people who loved the Big Bend area recognized its natural beauty and wanted to protect it for future generations. In 1933, the Texas Legislature passed a law to create Texas Canyons State Park, which was later renamed Big Bend State Park. In 1935, the U.S. Congress approved legislation to establish a national park. Texas gave the land to the federal government, and on June 12, 1944, Big Bend National Park officially opened to visitors on July 1, 1944.
Big Bend National Park remains one of the largest, most remote, and least-visited national parks in the contiguous United States. Between 2009 and 2019, an average of 377,154 visitors entered the park each year.
Geology
The oldest known tectonic activity in the park is connected to the Paleozoic Marathon orogeny, though events from the Proterozoic era (more than 550 million years ago) may have influenced it. The Marathon orogeny, part of the Ouachita-Marathon-Sonora orogenic belt, involves the movement of rocks from the South American Plate over the North American Plate. This process is most visible in the Persimmon Gap area of the park. This mountain-building event explains why rocks from the Triassic and Jurassic periods are not found in the park.
Between the Triassic and Cretaceous periods, the South American Plate separated from the North American Plate, leading to the formation of several rock layers, including the Glen Rose Limestone, Del Carmen Limestone, Sue Peaks Formation, Santa Elena Limestone, Del Rio Clay, Buda Limestone, and Boquillas formations. These layers are preserved in areas such as the Sierra del Carmen–Santiago Mountains, Nine Point Mesa, Mariscal Mountain, and Mesa de Anguila. During this time, the Chihuahua trough formed as the Gulf of Mexico expanded, causing faulting that stretched from east to west. This period allowed dinosaur, forest, and other fossils to be preserved in the park.
After the rifting ended during the Late Cretaceous to early Cenozoic periods, the Big Bend area experienced the Laramide orogeny. This event, marked by east-west compression, created features like the northeast-facing Mesa de Anguila (an uplifted rock layer on the park’s southwest edge), the southwest-facing Sierra del Carmen–Santiago Mountains (an uplifted and thrust-faulted rock layer forming the park’s eastern boundary), and the Tornillo Basin. During the middle Cenozoic, volcanic rocks such as the Chisos Group, Pine Canyon caldera complex, and Burro Mesa Formation were formed.
The most recent tectonic activity in the park is basin and range faulting from the Neogene to Quaternary periods. This east-west stretching created features like Estufa and Dehalo bolsons in the Chisos Mountains, as well as the Terlingua and Sierra del Carmen, Chalk Draw, and Burro Mesa Faults. The Rio Grande entered the Big Bend area about 2 million years ago, and since then, significant erosion and deep river cutting have occurred.
Cultural resources
Cultural resources in the park include the Paleo-Indian period, which dates back 10,500 years, and the historic period, which includes Native American groups such as the Chisos, Mescaleros, and Comanche. Later, Spanish, Mexican, Anglo, and Irish settlers lived in the area by farming, ranching, and mining.
During the prehistoric period, people built shelters and kept open campsites across the park. The archaeological record shows an Archaic-period desert culture, where people lived a nomadic lifestyle focused on hunting and gathering. This way of life changed very little for thousands of years.
The historic cultural landscape includes different ways people used the land for living or working. Areas near water and streams were used for farming and irrigation. These landscapes include roads, irrigation systems, simple homes and buildings, and farmland that was cleared and shaped along stream banks.
Flora and fauna
Big Bend National Park has more than 1,200 types of plants, including 60 kinds of cactus, over 600 types of vertebrates, and about 3,600 kinds of insects. The wide variety of life in the park is because of the different environments and changes in height, such as the hot desert, cool mountains, and fertile river valley.
The many types of plants, including cactus, add color to the area. Some cactus found in the park are prickly pear (Opuntia spp.), claretcup (Echinocereus coccineus), and pitaya (E. enneacanthus). In spring, wildflowers and yucca flowers bloom brightly. Bluebonnets (Lupinus spp.) are common in the park, and white and pink bluebonnets can sometimes be seen along roads. Other flowering plants, such as desert marigold (Baileya multiradiata), desert willow (Chilopsis linearis), ocotillo (Fouquieria splendens), rock nettle (Eucnide urens), and lechuguilla (Agave lechuguilla), grow in the park.
The candelilla plant (Euphorbia antisyphilitica) was important to the region because it was used to make candelilla wax. This led to the creation of wax camps, such as Glenn Springs, Texas, within the park area.
Many animals are not seen during the day, especially in the desert. The park becomes active at night, with animals searching for food. About 150 sightings of cougars (Puma concolor) are reported each year, even though only about 24 live in the park. Other animals in the park include coyotes (Canis latrans), kangaroo rats (Dipodomys spp.), greater roadrunners (Geococcyx californianus), golden eagles (Aquila chrysaetos), gray foxes (Urocyon cinereoargenteus), collared peccaries (Dicotyles tajacu), and black-tailed jackrabbits (Lepus californicus). Mexican black bears (Ursus americanus eremicus) also live in the mountain areas.
Plans to bring Mexican wolves (Canis lupus baileyi) back to Big Bend National Park were not approved by Texas in the late 1980s. Concerns included whether the park had enough prey, such as deer and javelinas, to support a wolf population.
More than 450 types of birds have been recorded in Big Bend National Park.
The park has eight main types of land cover, listed by how common they are: desert shrubland, igneous grassland, limestone grassland, riparian vegetation, montane woodland, bare ground, developed areas, and surface water.
Many birdwatchers visit the park because it is the only place in the United States where the Colima warbler (Leiothlypis crissalis) breeds. The Colima warbler arrives in the Chisos Mountains in mid-April and stays in the high canyons until mid-September, when it returns to its winter home in southwestern Mexico. The bird nests on the ground and prefers oak-maple habitats in areas like Boot Canyon and similar high, cool regions from Laguna Meadow to Boot Canyon and the South Rim. The first recorded sighting of the northern tufted flycatcher (Mitrephanes phaeocercus), a bird from Central America, in the United States was at Big Bend National Park in November 1991.
Fossils
Paleontologists started working at Big Bend National Park in 1907 when Johan Udden found shark and ammonite fossils. Between 1938 and 1939, a small group of men worked at three fossil quarries in Big Bend as part of a W.P.A. project. In 1940, fossil hunters like Barnum Brown and Roland "R.T." Bird arrived to search for dinosaur remains. They discovered the neck vertebrae of a giant sauropod called Alamosaurus and partial jawbones of a crocodylian species named Deinosuchus.
The first museum built to display fossils at the park burned down in 1941, and fossils such as mammoth teeth and saber tooth cat remains were destroyed in the fire. A new fossil exhibit opened in 1957, showing fossils of Hyracotherium, a horse ancestor, and Coryphodon, a large hippo-like animal that lived during the Eocene, about 55 million years ago. In 1990, the fossils were replaced with replicas, and the museum was redesigned in the 2000s. A new Fossil Discovery Exhibit opened in 2017. Today, people must have permits to legally collect fossils in Big Bend National Park.
About 135 million years ago, Big Bend was underwater. Fossils from this time include sharks, marine reptiles like plesiosaurs and pliosaurs, plankton, foraminifera microfossils, and larger mollusks. Fossils from 85–82 million years ago show Big Bend was covered by warm waters with sharks, small mosasaurs, and fish like Xiphactinus. Spiral-shelled ammonites and marine shelf invertebrates are also common.
When water levels dropped between 83–72 million years ago, the area that is now Big Bend became a mix of deltas with fish, sharks, large turtles, and crocodylians. Evidence of land animals includes herds of hadrosaurs, horned ceratopsids, armored nodosaurs, and tyrannosauroids.
At this time, Big Bend was above sea level. Animals included early carnivorous mammals, hadrosaurs, ceratopsians, tyrannosauroids, and the largest known pterosaur, Quetzalcoatlus. Its waterways had fish, rays, and amphibians.
In geological layers marking the end of the Cretaceous period, fossils of flowering plants, conifers, gar, rays, and bones of Alamosaurus have been found. The Cretaceous-Paleogene (K-Pg) extinction event occurred around 66 million years ago, causing the extinction of 70% of land life, including all non-bird dinosaurs and pterosaurs, and 90% of ocean life.
Big Bend has several hot springs, including those in the Hot Springs Historic District. The main hot spring is called Hot Springs, also known as Bocadillas Hot Springs and Langford Hot Springs. It is listed on the National Register of Historic Places. These hot springs were the first major tourist attraction in the Big Bend area before the national park was created. In 1909, J.O. Langford began developing the springs. A small stone soaking tub made of local stone was found at the site from before Langford’s development. A dugout shelter existed there, which the Langford family renovated as a home. They later built an adobe house, a stone bathhouse, and bathing shelters made of brushwood. In 1927, they rebuilt the bathhouse and added a store and a motor court with seven attached cabins.
Tourism
Big Bend National Park is known for its many hiking and backpacking trails. Important trails include the Chimneys Trail, which goes through a rock formation in the desert; the Marufo Vega Trail, a loop that travels through scenic canyons and reaches the Rio Grande; the South Rim Trail, which circles the high mountains of the Chisos area; and the Outer Mountain Loop Trail in the Chisos, which includes parts of the South Rim Trail, goes down to the desert along the Dodson Trail, and returns to the Chisos Basin, forming a 30-mile loop. Other interesting places in the park are Santa Elena Canyon, Grapevine Hills, and the Mule Ears, which are large rock towers in the desert. Professional guide services offer backpacking trips in the park.
The park manages 118 miles (190 km) of the Rio Grande for recreation. River tour companies provide trips along the river. People may use their own boats, but they must get a free river float permit. In 2009, the Department of Homeland Security began treating all river trips as if they left the country, requiring travelers to have proper identification, such as a passport, to return.
Visitors sometimes cross the Rio Grande to visit the Mexican village of Boquillas. The border crossing was closed in 2002 for security reasons after the September 11 attacks but reopened in 2013 as an official Class B Port of Entry between the U.S. and Mexico. It is open from Wednesday to Sunday, from 9 a.m. to 6 p.m.
Birdwatching is a popular activity in the park, as more than 450 bird species have been recorded there. Many of these birds stop in the park during their yearly migrations.
Five paved roads are in Big Bend. The road from Persimmon Gap to Panther Junction is 28 miles (45 km) long and connects the park’s northern entrance to Panther Junction, the park headquarters. The 21-mile (34 km) road from Panther Junction to Rio Grande Village goes down 2,000 feet (610 m) to the Rio Grande. The 23-mile (37 km) road from Maverick Entrance Station to Panther Junction links the western entrance to the park headquarters. Chisos Basin Road is 6 miles (10 km) long and climbs to 5,679 feet (1,731 m) at Panther Pass before descending into the Chisos Basin. The 30-mile (48 km) Ross Maxwell Scenic Drive leads to the Castolon Historic District and Santa Elena Canyon.
In 2012, Big Bend was named an international dark-sky park by the International Dark-Sky Association. The park received a Gold Tier designation for having very little light pollution. Studies by the National Park Service show that Big Bend has the darkest skies in the United States. On clear nights, thousands of stars, bright planets, and the Milky Way can be seen in the sky.
Education
San Vicente Independent School District is located on the park's land. In about 1951, the school moved to the Panther Junction area so children of park workers could attend a local school. Part of the park is in San Vicente ISD, and other parts are in Terlingua Common School District. Students in high school from San Vicente ISD attend Big Bend High School, which is part of Terlingua CSD.
Before 1996, Alpine High School of the Alpine Independent School District was the high school for students from Terlingua CSD and also for students from San Vicente ISD. Big Bend High School opened in 1996. San Vicente ISD began sending its high school students to Big Bend High School when it opened in 1996.