Ir is a wester diamond back rattle snake 
What Kind Of Snake Is Beige With Black Diamonds On Its Back? It Was About 3 Feet Long.
That was probably a 'diamond back' snake (common name) or 'Crotalus atrox' (scientific name). Be careful, they are venomous.
See
en.wikipedia.org
See
en.wikipedia.org
If the diamonds are diamonds, rattle snake. Leave it alone. If the diamonds are really hexagonal shapes, a rat snake. Which also hisses and pretends to rattle, agressive, will move away if it can, but not poisonous. Check out pictures of both, look at the nose and the tail. Preferable from a distance in case it is a rattlesnake.