text: You might be correct, but NHD data is also notoriously shoddy. If you are correct though, there isn't really a good tag for something like that. Nor do I personally think it's worth mapping. 
  
  Maybe as a marsh, but there's no such thing as an intermittent/seasonal marsh that I'm aware of. I should really look into it more though. Meanwhile NHD data is based on LIDAR and more often then not gets things horribly wrong. So my guess is that this a LIDAR mistake and not just a place where water pools up seasonally. I don't really know though. Which is why I've left it alone for two years without just deleting the areas. Maybe I will eventually, or there will be a usable tag for areas of intermittent pooled water. If that's even what this is. 