Tryon Creek Restoration Monitoring Project
Tryon Creek is located in southwest Portland and its headwaters are located within those neighborhoods. It flows approximately three miles through this privately owned land before entering Tryon Creek State Natural Area, a 640 acre area of public land, through which the creek flows another three miles. The lower most portion of Tryon Creek flows through public land owned by the City of Lake Oswego and the City of Portland. This portion of the stream is bisected by a culvert that runs under Oregon Hwy 43 and a railroad near the mouth of Tryon Creek (culvert).
Tryon Creek is one of the largest, relatively protected, urban watersheds in Oregon. A
number of native species can currently be found in this stream including Oncorhynchus mykiss (resident and anadromous) andcoastal cutthroat trout. Historically, it is thought
that Pacific lamprey and coho salmon also utilized this stream. However, the culvert is potentially inhibiting, if not
preventing, passage of lampreys and salmonids.
A collaborative project is being implemented by Oregon Department of Transportation, Oregon Department of Fish and Wildlife, Oregon State Parks, National Marine Fisheries Service, Cities of Portland and Lake Oswego, Friends of Tryon Creek, Tryon Creek Watershed Council, National Fish and Wildlife Foundation and U.S. Fish and Wildlife Service to improve passage conditions for anadromous fish migrating into Tryon Creek. A replacement project for the culvert will occur in two phases. The initial phase will retrofit the existing culvert with a new baffle system and provide some habitat restoration to the stream below the culvert to be more conducive to lamprey and salmonid holding and passage. The second phase will provide and implement a long-term solution to replace the existing culvert. Solutions currently being considered include a much larger culvert and a bridge.
The assessment and monitoring project that is being led by the U.S. Fish and Wildlife Service is being conducted in conjunction with the culvert replacement project. This project is being conducted in three phases: 1) pre-assessment and monitoring prior to the initial phase of culvert improvement; 2) post-assessment and monitoring subsequent to the initial phase and preassessment and monitoring prior to the second phase of culvert replacement; 3) post-assessment and monitoring subsequent to the completed culvert replacement project.
Tryon Creek Restoration Monitoring Project: 2008 Progress Report
For more information, contact Mike Hudson at 360-604-2575 or email Michael_Hudson@fws.gov