The Hermosa Creek project is one of the largest native trout restoration project ever done in the state. The work is critical for bringing this species back to western Colorado.
Located about 30 miles north of Durango, wildlife biologists identified the Hermosa Creek area as a prime spot for restoration more than 20 years ago. The first project was completed on the upper East Fork of Hermosa Creek in 1992. Cutthroat trout now thrive in that section. A second part of the project was completed in 2013 on the main stem of Hermosa Creek above Hotel Draw; and the native trout are thriving in that section of water.
All the projects include construction of rock barriers that prevent non-native trout from migrating into the restored sections of stream. Agency officials hope that the entire project will be completed by 2018.
On Aug. 4-5, crews will apply an organic piscicide to a 2-mile long section of East Hermosa Creek below Sig Creek Falls to just above the confluence with the main stem of Hermosa Creek. The piscicide, Rotenone, will eliminate non-native fish species—primarily brook trout. Rotenone has been used for years throughout the world for aquatic management projects because it breaks down quickly in the environment and poses no threat to terrestrial wildlife or humans. CPW biologists also use a neutralizing agent just below the treatment area to prevent any fish kills downstream.
Short sections of Relay Creek and Sig Creek above will also be treated.
The work area will be closed to the public during the operation. An administrative campsite will be reserved for use by CPW and USFS employees during the treatment work. Signs are posted in the closed areas and the public is asked to observe the closure.
Visitors below the treatment area might see rust-colored water–-that is the color of the neutralizing agent. Anglers will still have full access to Hermosa Creek and the upper section of East Hermosa Creek. Any cutthroat trout caught must be returned to the water.
Because of the complexity of the habitat along the East Fork, the section will most likely be treated again next summer to assure elimination of non-native fish. If all goes as planned, native cutthroats will be stocked into the stream late next summer.
While the project is scheduled for the first week of August, project managers will be keeping an eye on the weather as recent rains have swelled the creeks in the area. If the water is running too high, the project could be delayed until next summer.
The Hermosa Creek project is one of the most important native cutthroat trout restoration endeavors in Colorado. After completion of the lower East Fork section, more work will be done in the coming years on the main branch of Hermosa Creek. The end-point of the effort will be just below the confluence of the East Fork and Hermosa Creek.
“This project is especially important because it connects several streams in a large, complex watershed,” said Jim White, aquatic biologist for CPW in the Four Corners area. “The connectivity provides what biologists call ‘resiliency’ to the system. There are more stream miles available to the fish which allows for more genetic exchange. It also makes the fish less susceptible to disease and to large sedimentation events such as fires, mudslides or avalanches.”
Every year Colorado Parks and Wildlife deploys significant resources for native trout restoration efforts. Colorado’s native trout include: the Colorado River cutthroat trout; the Rio Grande cutthroat trout; and the Greenback cutthroat trout.
For more information about Colorado native fishes, go to cpw.state.co.us.
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