There are Sturgeon and there are Cats, just not in any real numbers. You will not be able to fish the Wanapum Reservoir though. Due to the dam crack the entire reservoir from Wanapum Dam to Rock Island Dam is closed down to recreation until they raise the water levels. From there you will be better off hitting Tri-Cities for the Cats or going to Potholes and fishing for Cats there. You can run up or down river to chase Sturgeon, but you will not find a very big population in the Priest Rapids or Rock Island pools. I do know they are caught, some big, in the Rock Island pool, just not very often.