Medano Creek flows through Colorado's stunning San Luis Valley, originating high in the Sangre de Cristo Mountains before disappearing into the towering sand dunes of Great Sand Dunes National Park and Preserve. This unique waterway serves as one of Colorado's most important refugia for Rio Grande cutthroat trout, representing a remarkable conservation success story. Over a decade ago, Colorado Parks and Wildlife prepared the creek for native cutthroat recovery by removing invasive species like brown trout through poisoning operations, then restocking with Rio Grande cutthroats. The isolated nature of Medano Creek, bounded by alpine basins at its source and desert valley floor at its terminus, creates a closed system where exotic species cannot naturally enter, making it an ideal sanctuary for these threatened native trout.