Certain species of ducks prefer certain water/spots. That's just a fact. If there are no divers on the little creek when they are on the big river, then you aren't going to shoot any divers on the little creek....no matter what decoys you put out.
That's the whole rationale behind scouting
; you can't just throw decoys out on any body of water and expect to have birds working them....you have to be where they
want to be.
Unless you can shoot that river, or other unfrozen water with divers on it, you may be SOL. It's very hard for an experienced duck hunter to pull birds down to a spot where they have no desire to be. For a neophyte, it's darn near impossible. Keep looking, and when you find a spot with birds that you can hunt, then
throw out a some ringneck decoys (at least 3).
Often wrong, never in doubt...