I saw that sign last week also, but was able to get through without issue. Not sure about trucked in rocks. That's what the trail looks like when it's not underwater. photo is about 100 yard up, you can see the leaning tree.
98 uzj100. Factory rear-ARB front locked 4.88's. ARB Bull, Warn 9000, Irbis rear bumper, Slee sliders and belly pan. OME t-bars w/863 rears, HID, XM