International
Scale of River Difficulty
CLASS
I Moving water a few riffles
and small waves. Few or no obstructions.
CLASS II Easy rapids
with waves up to three feet, and wide,
clear channels that are obvious without
scouting. Some maneuvering is required.
CLASS III Rapids
with high, irregular waves often capable
of swamping an open canoe. Narrow
passages that often require complex
maneuvering. May require scouting
from shore.
CLASS
IV Long, difficult rapids,
with constricted passages that often
require precise maneuvering in very
turbulent waters. Scouting from shore
is often necessary, and conditions
make rescue difficult. Generally not
possible for open canoes. Boaters
in covered canoes and kayaks should
be able to Eskimo roll.
CLASS V Extremely
difficult, long and very violent rapids
with highly congested routes that
nearly always must be scouted from
shore. Rescue conditions are difficult
and there is significant hazard to
life in event of a mishap. Ability
to Eskimo roll is essential for kayaks
and canoes.
CLASS VI Difficulties of Class
V carried to the extreme
of navigability. Nearly impossible
and very dangerous. For teams of experts
only, after close study and with all
precautions taken.
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