Regional office for Idaho Fish and Game.The Salmon area is home to the Salmon River, one of the few undammed waterways left in America. The river and its forks serve as the only pathways into the Frank Church-River of No Return Wilderness area, the largest single federally designated wilderness in the lower 48. Steelhead and salmon start and end their 900-mile journey to the ocean in this region of Idaho. Nine of Idaho’s big game animals roam the valleys and mountains in this area.