Notes
Ran a loop, met up with Chuck & Brooke and did another short loop, then met up with Alan, Erik & Django and we ran all the twin brooks loops since they obviously aren't skiable so reason to avoid the local trails and leave the park.
The brook we run through during the summer was jumpable from the tuttle road side of the trails, although you'd have to climb from the other direction. No wading required, though, even if the brook wasn't frozen.