The Diamond Creek Camp is a dispersed camping area. It does have restrooms and is good for a hunting staging area.
We cheated. It was too cold to sleep outdoors the month we arrived at the Diamond Creek Campground… give us a break, we're from Arizona!
The guard station can be rented cheaply through Recreation.gov and it was worth every penny! With a wood-burning stove, we stayed nice and toasty. There were plenty of cots to move close to the wood-burning stove for a cozy night sleep.