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Most native peoples that inhabit the basin today are descended from other groups that settled in the region beginning about 1,000 years ago.Europeans first entered the Colorado Basin in the 16th century, when explorers from Spain began mapping and claiming the area, which later became part of Mexico upon its independence in 1821.
Early contact between Europeans and Native Americans was generally limited to the fur trade in the headwaters and sporadic trade interactions along the lower river.
After most of the Colorado River basin became part of the U. in 1846, the bulk of the river's course was still the subject of myths and speculation.
The environmental movement in the American Southwest has opposed the damming and diversion of the Colorado River system because of detrimental effects on the ecology and natural beauty of the river and its tributaries.
During the construction of Glen Canyon Dam, environmental organizations vowed to block any further development of the river, and a number of later dam and aqueduct proposals were defeated by citizen opposition.
Most of the upper river is a swift whitewater stream ranging from 200 to 500 feet (60 to 150 m) wide, the depth ranging from 6 to 30 feet (2 to 9 m), with a few notable exceptions, such as the Blackrocks reach where the river is nearly 100 feet (30 m) deep.
Arcing northwest, the Colorado begins to cut across the eponymous Colorado Plateau, a vast area of high desert centered at the Four Corners of the southwestern United States.
The Colorado River is one of the principal rivers of the Southwestern United States and northern Mexico (the other being the Rio Grande). After entering Mexico, the Colorado approaches the mostly dry Colorado River Delta at the tip of the Gulf of California between Baja California and Sonora.
The 1,450-mile-long (2,330 km) river drains an expansive, arid watershed that encompasses parts of seven U. Known for its dramatic canyons, whitewater rapids, and eleven U. National Parks, the Colorado River system is a vital source of water for 40 million people in southwestern North America.
Large engineering works began around the start of the 20th century, with major guidelines established in a series of international and U. interstate treaties known as the "Law of the River". Most of the major dams were built between 19; the system keystone, Hoover Dam, was completed in 1935.
The Colorado is now considered among the most controlled and litigated rivers in the world, with every drop of its water fully allocated.
After leaving the confines of the Black Canyon, the river emerges from the Colorado Plateau into the Lower Colorado River Valley (LCRV), a desert region dependent on irrigation agriculture and tourism and also home to several major Indian reservations.Tags: Adult Dating, affair dating, sex dating