You might try giving it a shot over by Wallula, there's Casey's Pond which is really an inlet to Burbank Slough from the Columbia that might have some bass in there, I've never tried it this early in the year but you can catch some decent smallmouth in that area, I saw a boat in there this past week while I was driving from work. Also a little further up there's a bridge that's the inlet to the Snake and I've caught largemouth on the slough area in June, might be some fish in there now too.