Colorado River and little Colorado River, Arizona, USA:

The Colorado River is the principal river of the southwestern United States and northwest Mexico. The 1,450-mile river drains an expansive, arid watershed that encompasses parts of seven U.S. and two Mexican states. Rising in the central Rocky Mountains in the U.S., the river flows generally southwest across the Colorado Plateau before reaching Lake Mead on the Arizona–Nevada line, where it turns south towards the international border. After entering Mexico, the Colorado forms a large delta, emptying into the Gulf of California between Baja California and Sonora.Known for its dramatic canyons and whitewater rapids, the Colorado is a vital source of water for agricultural and urban areas in the southwestern desert lands of North America.[6] The river and its tributaries are controlled by an extensive system of dams, reservoirs and aqueducts, which furnish irrigation and municipal water supply for almost 40 million people both inside and outside the watershed.The Colorado's large flow and steep gradient are used for generating hydroelectric power, and its major dams regulate peaking power demands in much of the Intermountain West. Since the mid-20th century, intensive water consumption has dried the lower 100 miles of the river such that it no longer reaches the sea except in years of heavy runoff.Beginning with small bands of nomadic hunter-gatherers, Native Americans have inhabited the Colorado River basin for at least 8,000 years. Between 2,000 and 1,000 years ago, the river and its tributaries fostered large, sedentary agricultural civilizations, which may have been some of the most sophisticated indigenous cultures in North America. These societies are believed to have collapsed due to a combination of severe drought and poor land use practices. Most native peoples that inhabit the river basin today are descended from other groups that settled in the region beginning about 1,000 years ago. Europeans first entered the Colorado River watershed in the 16th century, when explorers from Spain began mapping and claiming the area, which later became part of Mexico upon its independence from Spain in 1821. Early contact between foreigners and natives was generally limited to the fur trade in the headwaters and sporadic trade interactions along the lower river.

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