All the rivers have them below 3500'. Most of the lakes as well. I always have a trap and catch them most places.

Read the game laws . There is a trick if you are not aware. In Wash you have to have the same set up for Dads as you do Crabs. You have to have the escape hatch with the the cotton string in case you lose your trap. Most commercial traps do not have this unless you have the old style wooden lobster type. The cone traps take an extra center section with the trap door.