Read Thread: State Parks Closing
So, do they give you a list of these opportunities when you sign on?
Yes, they do.
I've tried about 10 searches and have gotten zero results... do they not have any volunteer events listed?
Volunteer events are handled by the Friends chapter at each park. If the chapter for your "home" park doesn't have a website, you should call or visit the park and ask for the chapter contacts.
I was just talking about the volunteer project calendar- I can't find anything on it!
Right. Check with the local Friends chapter. I can tell you what's happening at The Bend, but it's a bit far for you guys. ;-)
The Friends chapter list is here. -- a place to start.