Why Was School Cancelled on Friday?

I've had a few people ask why school was cancelled on Friday....or at least, why school wasn't main roads only? In Michigan, you must have 75% of your students in attendance for it to count as an official day of instruction. In our situation we have many of our students that live on back roads (which were a sheet of ice Friday). If we would of had school on main roads only (like Marysville did), odds are we wouldn't of hit the 75% attendance level and it wouldn't of counted as an instructional day. Hope that helps