Im pretty sure youre issueis that the county has moved from that analog system to a P25 system, and is alsoencrypted.
If theyre on another system altogether, it would explain why youre not seeing "ENC" plus not hearing anything, besides the occasional dispatch that may be rebroadcast on the old analog channels.
The link that hiegtx posted shows people in your area confirming this.
No scanner will be able to listen to encryption, so you'd have to find a neighboring county that isn't encrypted that you can still pick up, or find another industry to listen to (planes, rail, business, hospitals,etc). It sucks, but it is what it is