Last Driven May 2014 (Historic Photo: April 2013) Location: I-15 at the Idaho Line, Box Elder Cty Reassurance shield as I-15 enters Utah. I-15 is Utah’s backbone, connecting the vast majority of its population. Location: I-15 at the Idaho Line, Box Elder Cty I-15 is designated the Veterans Memorial Highway in the states it passes … Continue reading Interstate 15, ID State Line to UT-13