Dave Rosgen, his smile shaded from the midday sun by the brim of his cowboy hat, moves easily along a branch of the main channel of Colorado's Blue River, casting his fly rod. One after another, big rainbow trout take his flies, jumping and fighting the line until he plays each one out to the bank, removes the hook and gently returns the fish to the clear, cold water. Rosgen, a hydrologist, helped bring this stretch of river back to life. The land along the water here had been hammered by years of cattle grazing, the banks eroded after willows were...
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