CLASSIFYING A RIVER

CLASS I:
Easy. Fast-moving water with riffles and small waves. Suitable for anyone age 5 and older, including the physically challenged.

CLASS II:
Straight forward rapids with wide, clear channels. Occasional maneuvering may be required, but rocks and medium sized waves are easily avoided. Suitable for the same group as class I.

CLASS III:
Rapids with moderate, irregular waves, which may be difficult to avoid. Large waves and strainers may be present, but are easily avoided. Injuries while swimming are rare. Suitable for those who not mind getting a little wet, otherwise, same as class I and II.

CLASS IV:
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. Risk of injury to swimmers is moderate to high, and water conditions may make self-rescue difficult. Suitable for those 12 and older, in good physical condition. With Black Diamond Expeditions experienced guides, this level is recommended for first-timers as well as those with prior experience.

CLASS V:
Obstructed or violent rapids which expose a participant to above-average endangerment. 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. Swims are dangerous and self-rescue difficult. Suitable for those who are comfortable with water, able to swim and in good physical condition. Depending on the water level, you may be required to take a practice river swim before the trip. Minimum age: 16 years.

CLASS VI:
These runs often exemplify the extremes of difficulty. Experts only! Rescues may be impossible. This class does not represent drops thought to be unrunable but may include rapids which are only occasionally run.