Rivers: Competition for the Catfish

It rises as a cold, clear mountain torrent in Colorado. It dwindles and almost dies while crossing the Kansas plains. Fed by tributaries, it meanders in great twists and turns through Oklahoma and Arkansas. It is one of America's muddiest rivers. Because of its sewage, silt and salt, the water is not fit for swimming, drinking or irrigation. In fact, the 1,450-mile Arkansas River is good only for the huge channel catfish, which have literally pulled fishermen into its muck.

But all this will change. Under way in the Arkansas basin is one...

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