I biked in from Hot Sulphur Springs. Online it advertises First Come First Serve sites. I did not see any of these. Ended up befriending a couple who let me set up my tent on the back end of their site for the night. The mosquitos were outrageous. From talking to the locals in Steamboat Springs the next day it sounds like this season is unusually rainy, so the mosquito issue could just be weather/ time of the year dependent.
TL; DR Bring bug spray
Update for others looking at this site wondering if COVID restrictions are up. They are. No more rocks blocking paths. Many people camping/ fishing down here. I’m bike camping and met other bike tourers on route here. The trans America trail goes through route 40 here. There are some clearly full timers who are living here. Relatively quiet. A nice river near by to to swim in.