Fish Habitat Improved in South Boulder Creek

South Boulder Creek near the East Portal of the Moffat Tunnel via Jason Lee Davis
South Boulder Creek near the East Portal of the Moffat Tunnel via Jason Lee Davis

Here’s the release from the US Forest Service (Maribeth Pecotte):

More than a mile of fish habitat along South Boulder Creek has been improved, thanks to a partnership between the Boulder Ranger District of the Arapaho and Roosevelt National Forests and Pawnee National Grassland (ARP), Colorado Parks and Wildlife (CPW), Denver Water, Boulder Flycasters (Trout Unlimited) and Union Pacific Railroad. The 1.5-mile stretch of the creek west of Rollinsville, Colo., will see enhanced in-stream habitats, allowing trout to thrive.

“”Trout biomass in Upper South Boulder Creek averages 60 lbs/acre, drastically lower than the abundance of trout within most front range streams such as the Poudre, Big Thompson, and St. Vrain Rivers,” said Ben Swigle, CPW aquatic biologist. “This project focused on improving in-stream habitats at all flows, which will allow a greater number of trout to inhabit the restored sections and support better natural reproduction.Thanks to this partnership, the fisheries and anglers of tomorrow will reap the benefits of our actions today.”

The portion of South Boulder Creek that has been improved lies between Rollinsville and the East Portal of the Moffat Tunnel. This stream picks up water from the West Slope and is carried through the Moffat Tunnel. The parties involved had long felt that significant habitat improvements could be made to benefit the fishery. In 2001, Denver Water, which operates the Moffat Tunnel, agreed to financially support habitat mitigation projects downstream of the tunnel and fund an additional $125,000 for fish habitat improvement upstream.

“Denver Water is committed to doing our part to help protect and enhance the natural environment,” said Dave Bennett, water resource manager for Denver Water. “We are happy to be a part of this collaborative effort to enhance the river for the benefit of the fish.”
Despite the floods of September 2013, the project moved forward this fall, with habitat structures and channel construction compete in early November 2013. As a result, CPW and Forest Service biologists expect to see more fish using the constructed habitat next year and larger fish in the future.

“This was an outstanding project that exemplifies how much more can be achieved when forces join together,” said Boulder District Ranger Sylvia Clark. “Enhancements to fish habitat in South Boulder Creek could not have been done by any of us alone. We’d like to extend a big ‘thank you’ to our partners, and we look forward to future opportunities for working together.”

The final phases of the project will be complete in spring 2014. The contractor will complete construction of the boardwalk for angler access off of the South Boulder Creek Trail. Disturbed sites will be revegetated with native plants with the help of Boulder Flycasters’ volunteers and staff from CPW and the USFS.


This collaborative effort was the brainchild of Swigle, who worked with the ARP to find a project that would offer the greatest public benefit. The USFS initiated analysis for the project in 2012, and the decision memo was signed in March 2013.

The Boulder Flycasters applied for a CPW Fishing is Fun grant and obtained $80,000 for the project. The group also contributed an additional $4,000 and volunteer support.

The Boulder Flycasters, CPW, Denver Water and the USFS came together to select a contractor to design and construct the habitat features in South Boulder Creek and the boardwalk for angler access just west of the Moffat Tunnel.

Union Pacific Railroad allowed the use of a portion of their easement near the Moffat Tunnel for staging materials and equipment. Through close coordination, they also allowed heavy equipment to cross over the railroad tracks to access the creek.

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