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This case study presents a safety analysis by the FHWA, Western Federal Lands Highway Division (WFLHD) Highway Safety Team. The WFLHD used the Interactive Highway Safety Design Model (IHSDM) software as part of the design process for the rehabilitation of Yale-Kilgore Road. Yale-Kilgore Road is a county owned and operated two-lane undivided road located in Clark and Fremont counties in Idaho (ID). The western half of the corridor in Clark County is unpaved and transitions to paved asphalt at the county line with Fremont County. Although the road is county owned and operated, a substantial portion of the corridor falls within the Caribou-Targhee National Forest, and the eastern terminus of the corridor is less than 30 miles from an entrance to Yellowstone National Park.