Monday, February 6th, 2023
Monday, February 6th, 2023

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Sediment likely killed some fish in the Colorado River

GLENWOOD SPRINGS, Colo. – A heavy monsoon event Tuesday night flushed a large amount of debris and sediment into the Colorado River above Dotsero, likely contributing to a large fish kill, Colorado Parks and Wildlife officials said.

Workers at the Shoshone Hydroelectric Power plant first reported seeing dead fish near the plant on Wednesday. By early Friday morning, Colorado Parks and Wildlife officials estimate that thousands of dead fish had appeared along the river, all likely succumbing to the large amount of mud, silt and debris that washed into the water.

"I have never seen the river this full of debris," said Perry Will, Area Wildlife Manger.

This summer, many fish in western Colorado have been stressed by low flows and high temperatures brought on by drought-like conditions. Wildlife managers believe the additional stress from debris and sediment swept into the rivers proved excessive for these fish.

"Many of the fish we inspected had fine silt on their gills," said Kendall Bakich, aquatic biologist for Colorado Parks and Wildlife in Glenwood Springs. "At this point, we believe that this is what led to the mortality, but we are continuing to investigate."

Wildlife officials say that some dead fish will continue to travel down river and may be visible to anyone traveling along the river; however, they advise that the fish all died several days ago and they do not expect continued fish mortality.

Most of the fish that were killed were both native and non-native suckers, along with a few trout. According to Bakich, suckers are more susceptible to heavy debris and sediment in the water because they are bottom dwellers.

Colorado Parks and Wildlife was created by the merger of Colorado State Parks and the Colorado Division of Wildlife, two nationally recognized leaders in conservation, outdoor recreation and wildlife management. Colorado Parks and Wildlife manages 42 state parks, all of Colorado's wildlife, more than 300 state wildlife areas and a host of recreational programs. To learn more about Colorado's state parks, please see: http://www.parks.state.co.us. To learn more about Colorado's wildlife programs, please see: http://wildlife.state.co.us.

For more information about Division of Wildlife go to: http://wildlife.state.co.us.

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