Yellowstone National Park, Fisheries & Aquatic Sciences Program will establish a viable genetically pure population of westslope cutthroat trout in High Lake using multiple brood sources, including those from Last Chance Creek, Geode Creek, and the Sun Ranch Upper Missouri River areas. Historically, westslope cutthroat trout occupied over 1000 square kilometers of stream habitats in Yellowstone National Park. Today, only one pure population is known to exist in an unnamed tributary (now named “Last Chance Creek”). In 2006,  the National Park Service removed non-native trout from High Lake and are now trying to  re-establish the native westslope cutthroat trout which will take several years. Using brood stocks from nearby rivers in the Upper Missouri, which are most genetically similar to the original native westslope cutthroat trout, the National Park Service hopes to establish a large enough self-sustaining population in High Lake to use as a brood source and be able to then re-establish other runs in historic habitat in the region. This project is strongly supported by state and federal agencies, the Sun Ranch Institute, and Trout Unlimited as well as other Montana and Wyoming non-profits.