Trail Creek in Teton County, Idaho/Wyoming is a tributary to the Teton River system, flowing through one of the most ecologically significant watersheds in the Greater Yellowstone Ecosystem. This mountain stream originates in the Teton Mountains and flows northwesterly before joining with Moose Creek and eventually reaching the Teton River. The creek supports both native and non-native trout populations and has been the subject of extensive fisheries research and conservation efforts. Trail Creek faces significant challenges from non-native species competition, particularly eastern brook trout, which have established dominant populations throughout much of the system. The stream represents both the opportunities and conservation challenges typical of high-elevation tributaries in the region.