Until 1998 the Colorado regularly flowed south along the Arizona-California border into a Mexican delta, irrigating farmlands and enriching a wealth of wildlife and flora before emptying into the Gulf of California.
But decades of population growth, climate change and damming in the American Southwest have now desiccated the river in its lowest reaches, turning a once-lush Mexican delta into a desert. The riverâ€™s demise began with the 1922 Colorado River Compact, a deal by seven western states to divide up its water. Eventually, Mexico was allotted just 10 percent of the flow.
Officials from Mexico and the United States are now talking about ways to increase the flow into the delta. With luck, someday it may reach the sea again.
It is paradoxical that the Colorado stopped running consistently through the delta at the end of the 20th century, which â€” according to tree-ring records â€” was one of the basinâ€™s wettest centuries in 1,200 years. Now dozens of animal species are endangered; the culture of the native Cocopah (the People of the River) has been devastated; the fishing industry, once sustained by shrimp and other creatures that depend on a mixture of seawater and freshwater, has withered. In place of delta tourism, the economy of the upper Gulf of California hinges on drug smuggling operations that run opposite to the dying river.