Another must see in the area is Palouse Falls (you get some idea of what the terrain looks like without irrigation). I took tons of shots of the falls. This one just happened to be the first one (I lucked out and got the rainbow).
NIKON D700 1/2 second F/18.0 ISO 160 35 mm (35mm equiv.)
I like the viewpoint you used to get this fine shot of the falls. I haven't been there in a long time. I must make that trip one day soon I hope. Excellent image.