Nason Crk RM 9.4-Thermal Refuge Prelim Design

This grant was used to complete the preliminary design phase of the Nason Creek RM 9.4 thermal refuge design project. The project components necessary were cultural resource surveys, site monitoring (and purchase of necessary equipment), development of preliminary designs, and permit application submittal. These are described below.
We contracted a qualified consultant to conduct cultural resource surveys. Cultural resource surveys were conducted in Fall of 2022, and a survey report was prepared and submitted to RCO.
We implemented a monitoring plan to inform the design process. We developed a monitoring plan to establish study protocols. We purchased necessary equipment, including water depth/temperature loggers. We conducted monitoring at the site in August and September of 2022.
We contracted a qualified consultant to develop preliminary designs. The consultant scope of work entailed topographic survey, hydraulic modeling, conceptual designs, preliminary designs, and PLS survey of the property boundaries. We hired a separate consultant to test site soils for contamination, as this information was critical to incorporate into designs (e.g., how much soil to remove below bridge abutments).
We applied for permit applications through the Army Corps of Engineers and Washington Department of Fish & Wildlife.

PCSRF 2017 funds were spent within the award period.

The goal of the proposed project is to complete all work needed to develop a preliminary design set for restoration actions that address Limiting Factors identified for Reach 8 of Nason Creek including water temperature, pool quality, contaminants and cover wood. The project also will complete cultural resource surveys and prepare permit applications, which will facilitate implementation . This is phase one of a two-part effort. Upon completion of this phase we will have a clear understanding of existing conditions and a preliminary design set for restoration actions that, when implemented, will enhance a documented cold surface water feature through addition of structure to provide cover and removal of a contaminant point source. The designs will identify actions intended to result in improved habitat characteristics important for a variety of spring Chinook, steelhead and bull trout life stages. Benefits from actions likely to occur are realized very quickly, persist for decades and are year-round in nature, but will be particularly beneficial during summer months when thermal conditions are most limiting for target species.