The Winter Report is updated weekly (at a minimum) by state parks during the winter season.
The report lists the ice thickness and what ice activities are available at that park. Sometimes a park can have ice, but if it is not thick enough, then the activities are not available.
The report also lists the snow thickness and what snow activities are available at that park. Sometimes a park can have snow, but if it is not thick enough, then the activities are not available.
The report is searchable by park and by winter outdoor recreation activity.