First, about the classes: Class I: Moving water with small waves (ideal for beginners) Class II: Rapids with waves up to three feet high. Clean, unobstructed channels with some maneuvering required. Guide must be able to maintain course. Class III: Irregular waves, scouting necessary, complex maneuvering, obstacles concealed. Difficult to control and maneuver. Class IV: Long, difficult rapids with tight passages. Boat tipping and swamping are real possibilities. If a customer falls in the water a possibility of injury is ever present. Class V: Quick rescue procedings must be in place. Precise and professional knowledge of the river course is a must.   The classes of the rapids are based upon Panamanian classifications.  We have been told many times that these classifications are understated compared to American and other classifications.  Be aware especially during the rainy season that our class III’s are easily comparable to U.S. class IVs and so forth. We reserve the right at any time to cancel trips if water levels exceed our standards of river safety for customers and guides. RANKED FROM MOST INTENSE TO LEAST: