Brigham City lies in southeastern Box Elder County on the western slopes of the Wellsville Mountains, a branch of the Wasatch Range, at the western end of Box Elder Canyon. Brigham City is generally considered to be the northern end of the Wasatch Front. To the west is a large, flat region of desert scrub, eventually giving way to marshlands on the edge of the Great Salt Lake. Interstates 15 and 84 pass to the west of the city together. U.S. 89 approaches from the south and U.S. 91 comes from I-15/84 to the west. They intersect in the city, climbing through Box Elder Canyon together. Two routes of the Utah Transit Authority's bus system also provide access to Brigham City from Ogden, and it also has a Greyhound bus stop. It is planned to be the northern terminus of the FrontRunner commuter rail line by 2020.