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In the 1930s, workers bored a 13-mile tunnel beneath Mt. San Jacinto. Here's a look inside the engineering feat that carries ...

A grateful Meriwether Lewis named a river after her. Later that month, Lewis and Clark first saw the Rocky Mountain chain, which they would have to cross to reach the Pacific. May 14, 1805 [Capt.

director of the Colorado River Delta program at the Sonoran Institute, a US-Mexican civil society group. The Colorado starts in the Rocky Mountains and winds its way through the southwestern ...