Biologists who discovered non-native smallmouth bass below Glen Canyon Dam will poison them to protect native Colorado River fish.
Water users of the Colorado River are facing a reckoning due to over 20 years of dropping river flow from overuse and a heating climate that are forcing allocation cutbacks.
are now leaving Lees Ferry water oxygen-starved. Warmer water has less dissolved oxygen, and the reservoir’s sinking surface elevation is causing flows through the dam’s tunnels to warm.WATER SHORTAGES:Low oxygen levels can stress and kill trout or force them to move downstream past where riffles add oxygen back into the flowing water. For now, trout remain evident in abundance at Lees Ferry.
The reservoir’s continued decline could warm the river further next summer, worsening the oxygen depletion.The agency treated the slough with the fish killer rotenone on Saturday and Sunday. A second treatment may be necessary within two months if more invasive fish are found to have hatched or hidden in the area’s dense vegetation.
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