Is it illegal in oregon to.....?

Play with fire I'm 12 years old and me and my friends want to make a dragon(a href="http://www.youtube.com/watch?v=4gVhEbCngnQ)" rel="nofollow"http://www.youtube.com/watch?v=4gVhEbCng…/a our parents say yes but they don't know if its illegal or not to make a fire on the concrete so is it illegal or not.