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| | Imperial Valley on Encyclopedia.com (Site not responding. Last check: 2007-10-26) |
 | | Several disastrous floods on the Colorado River in 1905-6 inundated the area; not until 1936, with the completion of Hoover Dam, was the valley safe from floods. |
 | | The valley is an important source of winter fruits and vegetables for the northern areas of the United States; cotton, dates, grains, and dairy products are also important. |
 | | Brawley, Calexico, and El Centro, Calif., are the main U.S. cities in the valley; Mexicali, Mexico, also in the valley, is the center of Mexico's important cotton-growing district. |
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