From your profile, I think your chipmunk is the Eastern Chipmunk, Tamias striatus. They're the most common chipmunk species in Virginia. That's what I have too, so this answer is based on the behavior of that species.
Don't deprive yourself of heat, especially in a blackout! If possible though, leave at least a few inches of dense wood and brush in that area. Chipmunks don't sleep in the wood pile, and they only give birth in underground tunnels, which are anywhere from 10 ft to 30 ft deep, so you can't physically hurt them. The covered areas are very important though. The chipmunks already chose them to hide the holes which lead to those tunnels.
Chipmunks select wooded banks, log heaps, stone piles, broken rocky ridges, or rubbish heaps as sites for their tunnels and nest chambers. Source
They're quite vulnerable to hungry winter predators, and they have their babies down there, so they're protective of their tunnel entrances. The safety factor is probably why your chipmunks who came out for a drink stayed close to their tunnel entrance.
Once the chambers have been completed, the chipmunk uses dirt to plug the working tunnel. As a result, the new entrance, which is usually located under stonewalls, fallen trees or rocks, goes unseen by predators. Source
Chipmunks gather food as far into the fall or winter as possible. Seeing some pop up for water in the late fall is common, even if you haven't seen much other recent activity. They also come up a few times during the winter looking for more food. (See my pictures below.)
Chipmunks don't truly hibernate. They go into a state called torpor, where their body temperature and metabolic rate are significantly lower, in order to survive the colder temperatures and long periods of time without food. They sleep deeply, but they spend a fair amount of time awake, often very busy. The tunnels I mentioned have different chambers, including food storage; waste and shells from eaten food; bathrooms; and birthing/nesting areas.
Like you, we try to strike a balance with our animals, but don't feel bad about using what you need. Technically, you can't dismantle their house, you can just leave it a bit more vulnerable, and sometimes confusing. If you lose your power, the underground chipmunk will be more comfortable than you are!
This is a girl (she was pregnant) who came up through 2 feet of snow in late February of 2017. The hole was in front of our brush pile. She worked so hard to get up, then decided she didn't like it at all! In the one on the farthest right she has all four feet in the air. There was nothing to eat in the area so she went running back to her hole!
She turned around, ran back to the hole, and down she went! The pictures are blurry because she was moving! Click to see a larger version.