Since this article applies to us, I figured I'd post it up for your reading pleasure.
Off-road riders feel pinch from Forest Service regulations (http://rapidcityjournal.com/news/off-road-riders-feel-pinch-from-forest-service-regulations/article_928401c0-5dcd-11e1-98b7-0019bb2963f4.html)
The good news is that the FS is working on improving the trail system. The bad news is that it's a slow process.