Mud? Ice? High water at stream crossings?
This is the place to let the hiking community know what you encountered, where and when (be as precise as possible). Suggestion: Make the trail or park name your subject.
To report serious trail problems that need Trail Conference attention, go here. Problems reported here get to the maintainers fast and reliably. Problems reported on the forum below help your fellow hikers avoid problem areas until they get fixed, but not all maintainers read this regularly so also use the problem report form.
To report illegal trail use go here.