When considering rivers or courses, you’ll see classification numbers for the water. These numbers are quite helpful in deciding on a destination and a specific section of water.
Water is classified from Class I through Class VI on an International Scale of Difficulty. Though it may be hard to almost impossible to compare different paddling situations, the general guidelines provide good rule-of-thumb comparisons and a guide for selecting appropriate courses.
Class I (easy)—The water is lightly bubbling with some small waves. Rocks and boulders are almost non-existent. If a member of the party falls overboard, it should be no problem to get to shore or back in the raft. This level is good for beginners and for small children.
Class II (novice)Some rapids are evident in class II sections, but water channels are wide enough to avoid rougher waters if paddlers are timid and opt to paddle around. Paddling on Class II might be thought of as the training wheel stage. If you’ve never been white water rafting and have not learned paddling skills, class II is a good starter course.
Class III (intermediate)—Starting with class III, rapids come into play. While the lower rated courses may have some leeway as far as paddling around, most class III sections are unavoidable. Once you start the course, you’re in for the wild ride. Some paddling skills are required to ride out class III sections. If a member of the party falls overboard, it takes a little more skill to get the person back on board.
Class IV (advanced)—Water is churning powerfully, and good paddling is essential to ride out class IV water. Narrow channels, churning waves, and deep holes characterize the more advanced portions of courses. If a boater goes overboard, it generally takes a group effort to rescue. Risk of injury is higher at this level of rafting. First timers do not want to learn paddling skills on class III. It’s also advisable to watch other rafters battle the rougher water before making a run.
Class V (expert)—Class five is classic white water with violent rapids and often long stretches of uninterrupted churning. Drops, larger waves, and congested chutes all contribute to making class V very challenging. Only highly experienced rafters should attempt class V water. All members of the paddling team should be solid on rescue skills. Attempting class V without the proper training and equipment could be deadly.
Class VI (extreme)—Very few paddlers ever tackle class VI. The water is very dangerous though potentially runable. Only experts should attempt extreme white water. Rescue would be difficult to impossible at this level.
Do keep in mind that water changes from one section of the river to the next. So, a class II with two class IV rapids will be generally calm water with a couple of rougher spots.