Many people don’t have a clear picture of how the river classification system works. It seems like would be fairly clear, but many people don’t know exactly what the classification of a river means when it comes to rapids and whitewater river rafting. Many people think that a higher rating means better rapids; this is not so and we will explaine why.
The American Canoe Association defines class 1 thru 6 as the following:
Class 1 - Fast moving water with riffles and small waves. Few obstructions, all obvious and easily missed with little training. Risk to swimmers is slight; self-rescue is easy.
Class 2 - Novice
Straightforward rapids with wide, clear channels which are evident without scouting. Occasional maneuvering may be required, but rocks and medium-sized waves are easily missed by trained paddlers. Swimmers are seldom injured and group assistance, while helpful, is seldom needed. Rapids that are at the upper end of this difficulty range are designated “Class II+”.
Rapids with moderate, irregular waves which may be difficult to avoid and which can swamp an open canoe. Complex maneuvers in fast current and good boat control in tight passages or around ledges are often required; large waves or strainers may be present but are easily avoided. Strong eddies and powerful current effects can be found, particularly on large-volume rivers. scouting is advisable for inexperienced parties. Injuries while swimming are rare; self-rescue is usually easy but group assistance may be required to avoid long swims. Rapids that are at the lower or upper end of this difficulty range are designated “Class III-” or “Class III+” respectively.
Intense, powerful but predictable rapids requiring precise boat handling in turbulent water. Depending on the character of the river, it may feature large, unavoidable waves and holes or constricted passages demanding fast maneuvers under pressure. A fast, reliable eddy turn may be needed to initiate maneuvers, scout rapids, or rest. Rapids may require “must” moves above dangerous hazards. Scouting may be necessary the first time down. Risk of injury to swimmers is moderate to high, and water conditions may make self-rescue difficult. Group assistance for rescue is often essential but requires practiced skills. A strong eskimo roll is highly recommended. Rapids that are at the lower or upper end of this difficulty range are designated “Class IV-” or “Class IV+” respectively.
Extremely long, obstructed, or very violent rapids which expose a paddler to added risk. Drops may contain** large, unavoidable waves and holes or steep, congested chutes with complex, demanding routes. Rapids may continue for long distances between pools, demanding a high level of fitness. What eddies exist may be small, turbulent, or difficult to reach. At the high end of the scale, several of these factors may be combined. Scouting is recommended but may be difficult. Swims are dangerous, and rescue is often difficult even for experts. A very reliable eskimo roll, proper equipment, extensive experience, and practiced rescue skills are essential. Because of the large range of difficulty that exists beyond Class IV, Class 5 is an open-ended, multiple-level scale designated by class 5.0, 5.1, 5.2, etc… each of these levels is an order of magnitude more difficult than the last. Example: increasing difficulty from Class 5.0 to Class 5.1 is a similar order of magnitude as increasing from Class IV to Class 5.0.
These runs have almost never been attempted and often exemplify the extremes of difficulty, unpredictability and danger. The consequences of errors are very severe and rescue may be impossible. For teams of experts only, at favorable water levels, after close personal inspection and taking all precautions. After a Class VI rapids has been run many times, its rating may be changed to an appropriate Class 5.x rating.
What does this mean to you:
First, most people think the higher the river rating, the better the rapid – not always true! Just because a river is only a class 3 rated river doesn’t mean it’s boring. Case in point – The Wenatchee river. The Wenatchee has some of the best whitewater in the state of Washington, but its only rated class 3! Its rated class 3 because the rapids are open, free of rocks and trees, easy to run, and very accessible to highway 2. Not to mention that at the end of each rapid is a calm spot, and it’s easy to swim to the side of the river.
Many class 4 and 5 rivers are rated class 4 and 5 because they are complex to maneuver and often choked with rocks and logs. A class 4 or 5 rapid can be hard to run not because of the rapids, but the difficulty of maneuvering around those rocks and logs in running that rapid Sometimes the rating can be obtained because of the danger of getting hurt if someone falls out of the boat. Not to mention, if someone was to get hurt, the road may be several miles away and hard to reach to obtain help.
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