The Skook out by me was ~50% frozen over yesterday when I drove down River Road north of Rt. 12. This is north of the Tulpehocken, which is fed from Blue Marsh, so I don't know if it's frozen downstream. Might have to go check it out later today.
I also want to see if anybody's out at Ontelawnee ice fishing. That's something I've always wanted to do, and this weekend might be a good weekend for it.