A federal judge has halted a controversial plan to poison streams in the Absaroka–Beartooth Wilderness to remove non-native trout and restock Yellowstone cutthroat trout. The project, proposed by Montana Fish, Wildlife & Parks and the U.S. Forest Service, would have used the chemical rotenone over roughly 45 miles of Buffalo Creek, a headwater drainage near Yellowstone National Park.

U.S. District Judge Donald Molloy ruled that the plan violated the Wilderness Act by diminishing the area’s wilderness character. Notably, Buffalo Creek was historically fishless—meaning the effort to “restore” native trout would actually have introduced fish to a naturally fishless ecosystem. The court found that the project’s heavy mechanized and chemical footprint, including helicopters and fish barriers (in-stream dams), was inconsistent with the “untrammeled” nature of wilderness.

This decision highlights mis-use of the concept 'ecological restoration' and stirs the growing national debate about how far agencies should go to manipulate wild systems. While native trout recovery remains a worthy goal, true wilderness may best be defined and understood by restraint. As this example should remind us, protecting cold, clean headwaters begins not only with science and policy—but with humility respecting nature’s own designs.