Some trails can't be ridden on warm days like today (above freezing) but Ionia can be! Little grease in some warmer locations but that is just the vegetative matter broken down on the trail. Below that hard packed gravel supports you.
Little worry of leaving ruts even with my "skinny" tired bike a Trek Fuel.
Trail was fast and clear.
Ionia State Recreation Area Trail Coordinator
"They say that the journey can be more important than the destination. In Mountain biking there is no destination. Just the bike. The rider. And a place to ride." - Roam