Grays Lake National Wildlife Refuge protects a near-pristine montane wetland in a high mountain valley of southeastern Idaho near Soda Springs. Known for the largest hardstem bulrush marsh in North America, it includes open marsh, wet meadows, and surrounding grasslands across about 20,125 acres, with adjacent lands mostly in wet meadow and grassland. The refuge is valued for its mountain scenery, summer wildflowers, and fall color, but especially for wildlife habitat. Moose, elk, mule deer, muskrat, badger, and weasel breed here. It is particularly important for birds, supporting many greater sandhill cranes and offering one of the better chances to see the rare trumpeter swan.