The stretch of the Rio Grande where we operate is rated Class II and III.
The stretch of the Lake Fork River where we operate is rated Class IV.
The Labyrinth Canyon stretch of the Green River where we operate is rated Class I.
Class I:
Waves small; passages clear; no serious obstacles.
Class II:
Medium Rapids of moderate difficulty with passages clear. Requires experience plus suitable outfit and boat.
Class III:
Difficult Waves numerous, high, irregular; rocks; eddies; rapids with passages clear though narrow, requiring expertise in maneuvering; scouting usually needed. Requires good operator and boat.
Class IV:
Long rapids; waves high, irregular; dangerous rocks; boiling eddies; best passages difficult to scout; scouting mandatory first time; powerful and precise maneuvering required. Demands expert boatman and excellent boat and good quality equipment.
Class V:
Exceedingly difficult, long and violent rapids, following each other almost without interruption; riverbed extremely obstructed; big drops; violent current; very steep gradient; close study essential but often difficult. Requires best person, boat, and outfit suited to the situation. All possible precautions must be taken.
Class VI:
Formerly classified as unrunnable by any craft. This classification has now been redefined as "unraftable" due to people having recently kayaked multiple Class VI around the world.
Read more about the rating system here:
http://en.wikipedia.org/wiki/International_Scale_of_River_Difficulty
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