DESCRIPTION
The Lower Dosewallips River Channel Restoration project aims to improve summer chum spawning habitat through restoration of historic floodplain processes in the stretch of river from the Highway 101 Bridge upstream 0.75 miles. This section of river begins just downstream of a major topographic constriction and is characterized by a braided channel pattern, which lacks aquatic habitat and generally has unstable channels and banks. This section has also been subject to significant sedimentation as a result of upstream forest practices and development. Although the past several years have brought an abundance of large wood into this section, much of this wood is relatively unstable. Currently, the thalweg of the river in this reach is running against a vulnerable bank that is occupied by developed residential properties and lacks mature forest conditions needed to recruit large wood and promote natural channel migration processes. The goal of this project is to improve aquatic habitat by promoting conditions that lead to stable vegetated islands and streambanks and allow the river channel to migrate more naturally. Returning natural channel pattern functions to this reach is a key step in restoring summer chum spawning habitat on the lower Dosewallips River. This will be achieved by conducting a reach analysis used to inform the design and construction of channel restoration, including engineered log jams (ELJs) to slow the flow.