A Forward-Looking Infrared (FLIR) flight is proposed to map the stream temperature of the lower Wenatchee during the low-flow, high temperature period. The lower mainstem Wenatchee River is an important migratory corridor for ESA-listed spring chinook, steelhead and bull trout as well as summer Chinook & sockeye. The Wenatchee River experiences high summer temperatures and is listed for temperature exceedances on the 303(d) list of water quality impaired streams. Because water temperature is known to influence the migration and pre-spawning mortality of salmonids, it is important to gain a better understanding of the abundance of thermal refugia on the lower Wenatchee River, to what extent salmonids use the cold-water habitat that currently exists, and where cold-water influences from tributaries and ground water seeps are located. FLIR has been used successfully to map summer salmonid holding habitats, as well as to identify areas of potential surface water/groundwater connectivity and cold-water influence within a system. Data collected from this study will provide valuable baseline temperature data, and information about the location and extent of use of thermal refugia by salmonids in this stretch of the Wenatchee. Future projects include protection and/or acquisition of land around key thermal refugia as well as protection and restoration of instream flows currently being identified by the Wenatchee Watershed Planning effort.