 The eastern end of this route is a one-way pair of 20th Street and 21st Street that connects I-15 and SR-126 to downtown Ogden, a distance of about .From the western terminus at SR-126 (1900 West) in Ogden, the route is named 21st Street, a standard two-way, east–west minor arterial, with an interchange with I-15 near the west end.This section of the route is about long.