It is very simplistic, the characters all talk like "yee haws", and not very detailed, except for the geology and landscape of the San Rafael Swell. So, I truly believe this is the type of book, guesstimating 5th grade and older, to read and develop an interest in geology, history, research and archaeology. That way, they show more interest, in high school, for these subjects; and perhaps go on to college to pursue them as well. Oh, and Bigfoot is the #1 suspect for the murder, so kids would still love to read it!
However, when it comes to law enforcement, the sheriff is characterized as lazy; deputizing locals, so he does not have to travel to crime scenes. His new deputy used to own the sandwich shop in town, thinks about food all the time, and when it comes to law procedures is characterized as rather a few fries short of a McDonald's Happy Meal. This would certainly make any young reader either believe that law enforcement is easy peasy; or an overall turn off to even consider as a career.
Living not too far from the town of Green River; I've been to the San Rafael area, and it is amazingly beautiful. The town itself though is pretty close to what is described in the novel; small, run down, and lacking in so many ways.