Many years ago, geologists stood on the bank of the Copper River and watched Childs Glacier thunder icebergs straight into the river. Using a little imagination, one researcher remarked how an advance of the glacier could seal off the big river.
This is not Henry Allen's Tanana River. Nor is it the Trail River of people living here thousands of years before the nineteenth-century government explorer struggled his way down the Tanana. But it seems close.