Box Elder Canyon is a canyon located within the western slopes of the Wellsville Mountains, a branch of the Wasatch Range of the Rocky Mountains in Box Elder County, Utah, United States. Box Elder Canyon and Wellsville Canyon together provide the routes of U.S. Route 89 / U.S. Route 91 across the Wellsville Mountains. Both of these canyons ar…Box Elder Canyon is a canyon located within the western slopes of the Wellsville Mountains, a branch of the Wasatch Range of the Rocky Mountains in Box Elder County, Utah, United States. Box Elder Canyon and Wellsville Canyon together provide the routes of U.S. Route 89 / U.S. Route 91 across the Wellsville Mountains. Both of these canyons are sometimes locally referred to as Sardine Canyon, although the actual Sardine Canyon is used by an old alignment of the highway along the eastern slope of the Wellsville Mountains.