Big Bend National Park - Texas

Established June 12, 1944

801,163 acres

As the Rio Grande winds south along the Texas-Mexico border, it suddenly veers northward in a great horseshoe curve before continuing its journey. Inside the horseshoe lies the region of Texas known as the Big Bend; Big Bend National Park flanks the river at the southerly tip of the curve. A wild and surprising land, the park remains remote enough that only the dedicated reach it.

Chihuahuan Desert vegetation— bunchgrasses, creosote bushes, cactuses, lechuguillas, yuccas, and sotols—covers most of the terrain. But the Rio Grande and its lush flood-plains and steep, narrow canyons almost form a park of their own. So do the Chisos Mountains; up to 20 degrees cooler than the desert floor, they harbor pine, juniper, and oak, as well as deer, mountain lions, bears, and other wildlife. A heavy rain transforms the very desert: Normally dry creek beds roar with water, and seeds long dormant burst into fields of wildflowers.

The rocks of Big Bend are a complex lot. Two seas, one after another, flowed and subsided in the region hundreds of millions of years ago, leaving thick deposits of limestone and shale. The present mountains, except the Chisos, uplifted along with the Rockies, roughly 75 million years ago. Around the same time, a 40-mile-wide trough—most of the present-day park—sank along fault lines, leaving the cliffs of Santa Elena Canyon to the west and the Sierra del Carmen to the east rising 1,500 feet above the desert floor. In the center, volcanic activity spewed layer upon layer of ash into the air and squeezed molten rock up through the ground to form the Chisos Mountains some 35 million years ago. Molten rock also cooled and hardened underground later to be exposed by erosion.

Big Bend's topographic variety supports a remarkable diversity of life, including a thousand plant species— some found nowhere else in the world. More species of birds—over 400—have been counted here than in any other US national park.

People have passed through this terrain for at least 10,000 years. The human pageant in historical times has included Apache, Spanish conquista-dores, Comanche, US soldiers, miners, ranchers and farmers, Mexican revolutionaries, and international outlaws and bandits.