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When Spokane millionaire F. Lewis Clark built his mansion in Hayden Lake in 1909, it was one of the largest and most expensive homes in Idaho.
Highway 54 is the shortest state highway in Idaho at 15.5 miles long. In the mid-1960 it as widened to four lanes between Athol and Farragut State Park to accommodate the large National and International Scout Jamborees.
The Mullan Road is the first engineered road connecting the Great Plains with the Northwest.
Tubbs hill was named in the late 19th century after Tony Tubbs, who was granted a homestead in 1884.
Cut into the hillside above I-90 is the Yellowstone Trail, prehistorically established by Plateau groups traveling to the Great Plains.