DESCRIPTION
The project will remove barriers that impede water movement through the system at an off-channel site in lower Twisp River between river miles 1.0-1.5. The project site is located at Methow Salmon Recovery Foundation?s Twisp Ponds restoration site, an off- channel system consisting of five ponds and channels, which provides high quality spawning and rearing habitat for UCR spring chinook, UCR steelhead, and other species.
The Habitat Connectivity at Twisp Ponds project is a restoration project that seeks to improve hydrologic connectivity between the Twisp River and throughout a connected off-channel system of ponds and channels. The project site is located at Methow Salmon Recovery Foundation's Twisp Ponds restoration site, an off- channel system in the Lower Twisp River between river miles 0.8 - 1.5. The system consists of five ponds and interconnecting channels that provide high quality spawning and rearing habitat for UCR spring chinook, UCR steelhead, and other species of fish. The Twisp Ponds system is supplied via an unscreened diversion structure designed & constructed with BPA support. While the diversion has proven effective through base flows, undersized culverts in the upstream segment between the diversion and the highest ponds are vulnerable to debris blockage, which reduces water conveyance to the downstream ponds and channels, impacting water quality and causing dewatering, juvenile salmonid stranding, and mortality. The project seeks to address this vulnerability by replacing the undersized culverts with larger culverts, cattle guards, or drivable fords that are less likely to become plugged with debris and reconnecting former flow paths to create an overflow channel to ensure water flows are maintained to the pond and channel system in the event of a blockage in the primary channel. MSRF is working with the WDFW engineer & biologist to determine suitable crossing options.