This is a project working on ESA listed stocks of spring/summer Chinook salmon in their headwater streams of central Idaho, tagging chinook parr to monitor their behavior and survival. The project began in 1991 and is one of the longest running datasets for wild Chinook salmon. A group of scientists from the Northwest Fisheries Science Center travel to central Idaho from mid-July to late-August, camping in various remote locations throughout central Idaho ranging between Salmon and Stanley, Idaho. Around 1,000 fish are collected via electroshocking or seining equipment and tagged with PIT tags in up to 16 headwater streams throughout the Salmon River basin. Two electroshocking teams work several miles upstream each day collecting Chinook parr and quantifying other fish species encountered. Chinook parr are transported from electroshocking teams to a mobile tagging station where they are PIT-tagged and later released. Post-field work includes data management and statistical analysis in order to quantify survival and migrational patterns of out migrating juvenile Chinook.