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Originally established in 1906 as the Salmon National Forest Reserve, now known as Salmon-Challis National Forest encompasses over 4.3 million acres across most of east-central Idaho, representing one of the largest contiguous blocks of public land in the lower 48s. US Department of Agriculture, Salmon-Challis National Forest History Today's Salmon-Challis National Forest is the result of early 20th-century conservation efforts under President Theodore Roosevelt. Its lineage