Rafting can be a dangerous activity if the proper precautions are not taken. Below is a generally accepted classification system used to classify rivers for rafting and boating difficulty:

• Class I - Easy. Fast moving water with riffles and small waves.
• Class II – Novice. Straightforward rapids with wide, clear channels.
• Class III - Intermediate. Strong eddies and current, requiring skilled maneuvering.
• Class IV - Advanced. Powerful but predictable rapids requiring precise boat handling in turbulent water.
• Class V - Expert. Long, obstructed, or violent rapids which expose paddlers to above-average danger.
• Class VI - Unrunnable.