Pituophis catenifer
The gophersnake, Pituophis catenifer, is a common species in much of Utah. It can be found in most habitats, ranging from low desert to high mountains. Gophersnakes are great at impersonating rattlesnakes, including vibrating their tails agains dead leaves and brush to mimic the rattling sound.
The below list of places are great places to possibly see the gopher snake.
The below links contain further information.