Supplement Analysis for the Watershed Management Program EIS (DOE/EIS-0265/SA-71) - Duncan Creek Channel Rehabilitation Project
- Bonneville Power Administration (BPA), Portland, OR (United States)
BPA proposes to fund a project with the Washington State Department of Fish and Wildlife that will restore historic spawning areas for chum salmon in Duncan Creek. Duncan Creek, a Washington tributary of the Columbia River, was traditionally an important spawning area for chum salmon. The spring seeps areas that chum historically used for spawning are still present in Duncan Creek, however during the past 30 years they have been covered by sediment and debris and infested with reed canary grass. This project proposes to rehabilitate these spawning channels in order to provide chum salmon with a protected spawning and incubation environment. The proposed habitat rehabilitation project will include removing existing gravel in the seeps of Duncan Creek that contain mud, sand, and organics and replacing them with gravels that will maximize egg-to-fry survival rates for chum salmon. A trackhoe or similar equipment will be used to excavate the spawning sites. Invasive vegetation will be removed. Spawning channels will then be reconstructed using sediment free spawning gravels and base rock. Upon completion of work, all disturbed spring channel banks will be protected from erosion with staked coir fabric and revegetated with native willows. Plantings will help to restore native plant communities, increase stream channel shading, and reduce re-infestation by reed canary grass.
- Research Organization:
- Bonneville Power Administration (BPA), Portland, OR (United States)
- Sponsoring Organization:
- USDOE Office of NEPA Policy and Assistance (EH-42)
- OSTI ID:
- 824077
- Report Number(s):
- DOE/EIS-0265/SA--71
- Country of Publication:
- United States
- Language:
- English
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