So I offer some pictures of these shelters (sometimes called a leanto), for your virtual enjoyment. Starting with a PA shelter on a rainy morning.
Next we head south to NC, TN
This next one is closed since it is on NPS lands (Great Smoky MTN).
Virginia?
This is the southern most shelter just north of Springer Mountain.
The following are in NH or ME.
Pretty sure this is in PA, south of Caledonia State Park.
This one is Stratton Pond, VT and our dog Katie.
Makes sense to close shelters since you cannot practice social distances when you are crammed together.