The Grand Canyon (Courtesy of Wikimedia Commons)
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Several miles from Phantom Ranch, Grand Canyon, Arizona, April 2013—Down here, at the bottom of the continent’s most spectacular canyon, the Colorado River growls past our sandy beach in a wet monotone. Our group of twenty-four is one week into a 225-mile, eighteen-day voyage on inflatable rafts from Lees Ferry to Diamond Creek. We settle in for the night. Above us, the canyon walls part like a pair of maloccluded jaws, and moonlight streams between them, bright enough to read by.
One remarkable feature of the modern Colorado, the great whitewater rollercoaster that carved the Grand Canyon, is that it is a tidal river. Before heading for our sleeping bags, we need to retie our six boats to allow for the ebb.
These days, the tides of the Colorado are not lunar but Phoenician. Yes, I’m talking about Phoenix, Arizona. On this April night, when the air conditioners in America’s least sustainable city merely hum, Glen Canyon Dam, immediately upstream from the canyon, will run about 6,500 cubic feet of water through its turbines every second.
Tomorrow, as the sun begins its daily broiling of Phoenix, Scottsdale, Mesa, Tempe and the rest of central Arizona, the engineers at Glen Canyon will crank the dam’s maw wider until it sucks down 11,000 cubic feet per second (cfs). That boost in flow will enable its hydroelectric generators to deliver “peaking power” to several million air conditioners and cooling plants in Phoenix’s Valley of the Sun. And the flow of the river will therefore nearly double.
It takes time for these dam-controlled tidal pulses to travel downstream. Where we are now, just above Zoroaster Rapid, the river is roughly in phase with the dam: low at night, high in the daytime. Head a few days down the river and it will be the reverse.
By mid-summer, temperatures in Phoenix will routinely soar above 110°F, and power demands will rise to monstrous heights, day and night. The dam will respond: 10,000 cfs will gush through the generators by the light of the moon, 18,000 while an implacable sun rules the sky.
Such are the cycles—driven by heat, comfort and human necessity—of the river at the bottom of the continent’s grandest canyon.
The crucial question for Phoenix, for the Colorado and for the greater part of the American West is this: How long will the water hold out?
Major Powell’s Main Point
Every trip down the river—and there are more than 1,000 like ours yearly—partly reenacts the legendary descent of the Colorado by the one-armed explorer and Civil War veteran John Wesley Powell. The Major, as he preferred to be known, plunged into the Great Unknown with ten companions in 1869. They started out in four boats from Green River, Wyoming, but one of the men walked out early after nearly drowning in the stretch of whitewater that Powell named Disaster Falls, and three died in the desert after the expedition fractured in its final miles. That left Powell and six others to reach the Mormon settlements on the Virgin River in the vicinity of present-day Las Vegas, Nevada.