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Through the Grand Canyon the Colorado drops in elevation abont 2,200 feet in 280 miles ; moht of this drop occurs in rapids that account for only 10 percent of the distance. Despite the xmportance of rapids, there are no waterfalls. Depth measure ments made a t Xo-mile intervals show that the bed profile is highly irregular, but the apparent randomness masks a n organized alternation of deeps and shallows. Measurement 'of the age of a lava flow that once blocked the canyon near Toroweap shows that no appreciable deepening of the canyon has tnhen place dnririg the layt million years. I t is reasoned that the river has had both the time and the ability to eliminate the rnpids. The long-continlied existence and the relative straightness of the longitndinal profile indicate that the river maintains a state of rluasi-ecluilibriiun whith provides the hydraulic requirements for carrying the debris load brought in from upstream without continued erosion of the canyon bed. The maintrnance of the alternating pools and rapids Seems to be a necessary par t of this poised or equilibrinm condition.

The Colorado River region and John Wesley Powell