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Whitewater Rapids Ratings
Whitewater rafting rivers are classified in the following terms for comparison of ease or difficulty of passage through the rapids at various water levels throughout the year.
- I — Easy
- Small waves, clear passages
- II — Medium
- Clear passages, irregular waves
- III — Difficult
- Numerous waves, rocks, eddies and narrow passages
- IV — Very Difficult
- Powerful waves, numerous rocks, difficult passages, precise maneuvering required
- V — Extremely Difficult
- Long and violent rapids in quick succession, violent currents, steep gradients
- VI — Un-runnable
- Not attempted by commercial outfitters
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Yampa
Yampa and Green Rivers
[Colorado and Utah]
Dinosaur National Monument
Rapid Classification: Class III-IV
May-June: IV-V

Lodore Canyon
Green River
[Colorado and Utah]
Dinosaur National Monument
Rapid Classification: Class II-III

Desolation Canyon
Green River [Utah]
Rapid Classification: Class II-III

Cataract Canyon
Colorado River [Utah]
Canyonlands National Park
Rapid Classification: Class III-IV
May-June: IV-V

Ruby / Horsethief Canyon
Colorado River
[Colorado and Utah]
McInnis Canyons National Conservation Area
Rapid Classification: Class I-II

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