Trout Lake is popular with anglers for its large (14-20") Yellowstone cutthroat trout and very large (20-30") rainbow trout and rainbow/cutthroat hybrids. The lake can be easily fished from the shoreline, but many anglers carry in float tubes to access the deeper parts of the lake. Using a float tube on Yellowstone lakes requires a park service boating permit.[3] The lake opens for fishing on Memorial Day weekend. The inlet stream to the lake is permanently closed to protect spawning cutthroat trout.[4][5] All cutthroat trout and hybrids caught in Trout Lake must be released.[6]
^Mathews, Craig; Molinero, Clayton (1997). The Yellowstone Fly-Fishing Guide—An authoritative guide to the waters of Yellowstone National Park. Guilford, CT: The Lyons Press. ISBN1-55821-545-X.