There ain't no deer in watersheds. They can read those "Keep Out" signs just fine, but their eyes aren't good enough to read the fine print that says "Hunters allowed in during regular hunting season only", so they just stay out of the watersheds and any hunter that would go to the bother of hiking in after the deer that aren't there is just wasting his time.
If you insist on going after watershed deer, try to find a watershed that is managed for timber harvest also. Otherwise the deer habitat can be pretty sparse.