From the Glenwood Springs Post Independent:
BLM is also working with Colorado Parks and Wildlife, National Fish and Wildlife Foundation, and Trout Unlimited to install a fish barrier in East Fork Parachute Creek as part of an effort to maintain native Colorado River cutthroat trout in this drainage.
The Colorado River cutthroats on the Roan Plateau are considered some of the most genetically pure, but non-native brook trout introduced many years ago into the East Fork Parachute Creek are threatening that drainage’s cutthroat population.
“If we don’t take action now, we expect the cutthroat to be completely gone from the East Fork in one to three years,” said BLM West Slope Fisheries Biologist Tom Fresques.
The concrete fish barrier will be installed near the confluence with Third Water Gulch. It will prevent brook trout from moving upstream, which will allow biologists to begin reclaiming the cutthroat population upstream of the barrier.
More endangered/threatened species coverage here.