How venomous are western diamondbacks?

[SSSSnakes]

You do not have WDB in Washington. You have Western Rattlesnakes (Crotolus viridis) and Northern Pacific Rattlesnakes. The severity of the bite is different with each case. There are many factors involved. A ny venomous bite can kill you depending on how your body reacts to it. Plus I don't know who told you, but you can't tell the age of a Rattlesnake from the rattles on it tail, unless it was just born.