Well we did get muddy as there was the occasional stretch that the only way was through the middle. It is just that 95% of the mud you could go around on the sides. Plus the mud we did go through had a fairly solid bottom. My son was on his 690 with worn ADV tires and always made it through. I was on dual sport rock tires and I did throw a bit of mud on the back of the bike. The lack of dust was well worth the occasional mud.