Do you actually have a model with 1350+ columns? If I were you I'd normalize the whole setup like this:
class Site(Model):
site_name = Charfield()
date = DateField()
class Nest(Model):
name = Charfield()
condition = Charfield()
site = ForeignKey(Site)
And then query it like this:
site = Site.objects.get(pk=1) # just a Site, I assume you know a Site
nests = Nest.objects.filter(site=site).filter(condition='1E') # your desired nests