I would reserve for a yurt
Yes, this time of year flooding maybe issue. Always check first.
Yes
Not during off season, normally. But it doesn't hurt to check page for availability.
I just stayed in a yurt here with no reservation last weekend. There was plenty of availability. I called ahead of time to make sure, but this time of year (December) my guess is you'll be fine. You have to get there before 8 and get the key from the campgroind host. They take cash and credit (maybe checks too but I don't know--who uses checks anymore!?)
If you dont want to then just check the page for available spots and cross your fingers nobody buys it before you get there lol
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