Tag: dams

Droughts threaten one of the Southwest power grid’s biggest electricity generators

This article was originally featured on High Country News. Thirty-nine years ago, due to record-breaking snowfall in the Upper Colorado River Basin, Lake Powell rose substantially, catching river managers off-guard. By late June, the reservoir was nearly overflowing, forcing operators—for the first time ever—to rely on the spillways. Instead of giving relief, that precipitated a […]

Most large rivers don’t flow freely anymore

Of the 246 rivers longer than 621 miles, only about a third flow freely across their entire length, according to the study, published Wednesday in the journal Nature. The rest are dammed, channelized, or otherwise heavily developed. “Our results are even worse than in the past,” says Bernhard Lehner, an author on the study and hydrologist at McGill University. “Fifteen years ago, researchers said about half of the large river basins in the world are impacted, and we now say two-thirds.”