During the 20th century, the range of fluvial Arctic grayling has been restricted to the Big Hole River of southwest Montana, less than 5 percent of its native range. MIGRATION: The Montana fluvial ...

At one time, Montana Arctic grayling were found throughout Missouri headwaters above Montana's Great Falls, but river diversion and degradation have reduced the species to a single population on a ...

The nonprofit Teton Regional Land Trust continues to strive to conserve the basin cradled between the Big Hole and Teton ...