JACKSON, WY\u2014 A whitewater rafting trip through the Snake River Canyon carries boaters through nine whitewater rapids Class II-Class III\u2014 but what does that really mean? Before you embark on a whitewater trip, it's important to know the classifications and what they mean, especially when rafting with kids on a family trip.\r\n\r\nLuckily, Dave Hansen Whitewater has spelled it all out. Know before you go!\r\nThe International Scale of River Difficulty\r\nThe\u00a0international scale of river difficulty\u00a0is an American system used to rate the difficulty of navigating a stretch of river, or a single rapid.\r\nClass I Rapids\r\nFast 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.\r\nClass II Rapids: Novice\r\nStraightforward 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 \u201cClass II+\u201d.\r\nClass III: Intermediate\r\nRapids 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 \u201cClass III-\u201d or \u201cClass III+\u201d respectively.\r\nClass IV: Advanced\r\nIntense, 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 \u201cmust\u201d 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 \u201cClass IV-\u201d or \u201cClass IV+\u201d respectively.\r\nClass V: Expert\r\nExtremely 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. Also, 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\u2026 each of these levels is an order of magnitude more difficult than the last.\r\nClass VI: Extreme and Exploratory Rapids\r\nThese 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 rapid\u00a0has been run many times, its rating may be changed to an apppropriate Class 5.x rating.\r\nOur 8-Mile Stretch of Whitewater Rafting the Snake River\r\nOn a scale from I-VI, the rapids on the Snake River are class II-III during normal water flows. During the springtime runoff (typically the first couple weeks in June), waves can get up to a class IV. When the Snake River gets up to these levels, the minimum age limit for whitewater rafting may change. Dave Hansen Whitewater suggests that if you are planning a trip for the first couple weeks of June and you are whitewater rafting with kids, to give them a call to make sure the age limit has not been raised. These are the\u00a0classifications of the rapids\u00a0on our 8-mile stretch of whitewater rafting on the Snake River according to the American Whitewater:\r\n\r\n \tStation Creek (Class II+, Mile 0.7)\r\n \tDouble D (Class III, Mile 1.8)\r\n \tHaircut Rock (Class III, Mile 2.2)\r\n \tBlind Canyon rapid (Class II+, Mile 4.8)\r\n \tBig Kahuna (Class III+, Mile 5.1)\r\n \tLunch Counter (Class III, Mile 5.2)\r\n \tRope (Class III, Mile 5.7)\r\n \tChampagne (Class III, Mile 6.3)\r\n \tCottonwood (Class III, Mile 6.8)\r\n\r\n\r\n\r\nVisit Dave Hansen Whitewater's blog for more useful tips and information about the river.