I would spend some time investigating trail networks in the area that might serve as alternatives if the roads are blocked. Google Earth is a fantastic resource here.
I agree, this whole area is criss crossed with old logging roads etc and Google Earth is very good tool. Not a week goes by that I don't use it to "explore" new areas.
Overall, keep your options open. Stock your vehicle with versatile gear. Thee is always the possibility, I take it, that the focal point of the emergency might be at your "away"location and that you might be occupied there for a considerable time.
Again I agree. The kit already in the car trunk makes an unexpected stay much easier. We always have shelter, clothing, food and water. With these needs met, there is not a lot more to really worry about when it is time to stay put and hunker down until help arrives and or conditions improve.