Any open water fishing in Mid-December is a great trip. We had upper 60's here yesterday, mid-20's here for a high today. Wicked wind storm here last night. Lots of damage.
A buddy and I actually hit the Mississippi backwaters yesterday morning but found them slushed over from the heavy snow earlier in the week. Check a marina's dock pilings but found those slushed in too. No real ice, just slush a foot deep. Glad you found some open yet.