How are rivers graded for difficulty?
Rapids are graded 1-6, Grade 1 (Class 1) being slow moving current. Grade 6 (Class 6) being wild raging rapids that can not be safely rafted. Grades vary according to the technical difficulty to raft, rocks and water features, water volume and hazards. Commercial whitewater rafting is usually Grade 2-5 with Grade 3-4 most common. The Nagara is a natural river without dams so the water volume varies according to the weather. It is generally considered a Grade 3 river. Depending on the river level, often it can have exciting large bouncy rapids while at lower levels may have smaller rocky drops. It is not very technical and has relaxing calm sections between rapids.
