DESCRIPTION
The Tahuya River Watershed Assessment aims to provide a watershed characterization that will be utilized to diagnose impaired habitat that is negatively impacting habitat forming processes and salmon productivity, with an emphasis on the summer chum population. The Tahuya River watershed is situated along the southeastern shore of Hood Canal. The river mainstem is approximately 21 miles in length, with several large tributaries that total roughly 44 miles in length. Principal land uses found in this watershed include forestland, agricultural and residential, the last being primarily located in the lower portion of the watershed. Additionally, the Tahuya State Forest has an extensive off-road vehicle trail system located in the upper watershed which does afford access to the river crossing for motorized vehicles. The goals of this assessment are to identify core causes of habitat degradation and to characterize habitat conditions in the Tahuya River watershed, including past, present and projected trends. Create a prioritized list of recommended restoration actions to address habitat problems and vulnerabilities identified. Develop conceptual project designs for the top 5 ranking restoration actions identified in the prioritized list.
Hood Canal Salmon Enhancement Group worked with consultants to carry out and report on a hydrologic and geomorphic watershed assessment of the Tahuya River. The assessment report highlights and prioritizes projects in the Tahuya River Watershed that will have habitat benefits for Hood Canal summer chum salmon.
The goal of this assessment is to identify core causes of habitat degradation and other issues negatively impacting Hood Canal Summer chum salmon productivity in the Tahuya River and to identify areas where habitat-forming process are fully functional. The watershed assessment included site visits to perform a geomorphic and qualitative assessment. In addition the consultant developed a hydrologic model of the river at a watershed scale and utilized historic satellite imagery along with current lidar.
The information gathered was analyzed and used to create a prioritized list of restoration and protection actions based on the current and projected future conditions which included the effects of climate change on salmon habitat in the system.