Rivnuts from Homestead, PA on 1/11/2022 10:52:20 AM:
The GAP and C&O each have a website that cites the conditions/alerts for travel thereon. These are shown below. Updates to these sites are not instantaneous, however, so it is important to monitor forums and message boards such as this one to confirm or augment the listed conditions. Contributors to this and other forums along with the riders on the trails themselves provide the best current conditions and you would do well to check these forums and/or post questions to them as you get closer to and even during your trip.
https://gaptrail.org/updates/
https://www.nps.gov/choh/planyourvisit/conditions.htm