I caught a walleye on a spinnerbait down at Pueblo years ago-its the only one. When I throw a spinnerbait (not much anymore) I go with a tandem or a double willow in 1/4 or 3/8 oz. I like the titanium ones best-I think the thinner/more flexible wire puts out more flash and vibration. White/chartreuse or a shad color on the skirt, one silver blade, one gold or both silver.
I think fish get wise to a spinnerbait pretty fast-down at Pueblo you'll wear your casting arm out if thats all you fish with. Jigs and soft plastics are the way to go for bass that have "graduated".