Stretching south for hundreds of miles from Glacier National Park lay a majestic mixture of valleys, rushing streams, and gargantuan mountains called the Bob Marshall Wilderness. Backpackers have hiked there for decades looking for elk, grizzlies and golden eagles. Fortunately the grizzlies stay up in the high country, but a golden eagle may be spotted and the elusive wolverine may be tracked.

The Bob Marshall Wilderness hosts some 90,000 packers and hikers each year, most of them in the months of July and August. They must come in either by foot or horseback. No motorized vehicles are allowed. The f…