Colorado killing nonnative trout to bring back native cutthroat trout

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Non-native trout will be removed from Colorado creeks to make way for the threatened greenback cutthroat trout.

Temporary closures of trails and campgrounds will be in effect during the project.

Two popular nonnative fish species will be poisoned along miles of rivers near the boundary of the Arapaho and Roosevelt National Forests and Rocky Mountain National Park to make way for Colorado's state fish: the greenback cutthroat trout.

Rotenone, a pesticide that kills fish, is being applied to about 4 miles of creeks in the area, including La Poudre Pass Creek downstream to the inlet of Long Draw Reservoir, according to a news release. That process was expected to run Aug. 25-31, according to the release.

The pesticide will remove 500 to 2,000 nonnative Colorado River