Since I am stuck in the house today, I thought I'd post a link to the owl location to help those who want to head over.
This old message seems as good as any. It sounds like the bird is most often found near the bridge on the AT.
Parking on the roadside is probably not popular with road crews considering the conditions, so I'd suggest the AT parking area.
http://birding.aba.org/message.php?mesid=345513&MLID=NH&MLNM=New%20Hampshire
The above link takes you via the ABA website.
A direct link to the NH bird group is
https://groups.google.com/forum/?fromgroups=#!forum/nhbirds
I noticed that the bird was seen near the red barn on Trescott Road at 8:55 this AM
Good luck.
Kyle