From what I've seen, deer are a similar story. I would say numbers are generally down statewide but the west river deer have been impacted more. EHD killed a lot of deer in the south central part of the state in 2012 after the flooding.
That being said, huntable numbers do exist in most areas imo. If you're the type of guy that is willing to hunt a lower population of animals to avoid crowds, SD might be worth looking into.
These are simply my observations and I am in no way an expert. Maybe Retterath can touch on what i've said?