Not to mention shagbark hickory doesn't grow this far north! I know bark on old silver maples can also have that shagbark look. These two trees are the only red maples I remember seeing that look like shagbark, however that just may be because they are in my woods and I see them pretty much every day (and just haven't paid that much attention when out in the national forest as I'm looking more at downed trees for potential firewood than standing ones or looking for bear/deer for the freezer).
