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Idaho Boating Safety Handbook Idaho State Parks and Recreation

It's the Law: On the Water

Diver-Down Flag

  • Scuba divers or snorkelers should display a diver-down flag that marks their diving area.
  • Vessels must reduce speed to "no wake speed" while within 100 feet of the flag.
  • Two types of flags are used to indicate diving activity.

Illustrations

Types of Flags
Red rectangular flag with white diagonal stripe Divers Flag
A rectangular red flag with a white diagonal stripe is used on Idaho state waters.
Blue and white vertically striped flag Alfa Flag
A blue and white International Code Flag A (or Alfa flag) must be displayed on vessels on federally controlled waters.

Skier-Down Flag

Skier-down flagIdaho law states that vessels towing person(s) on water skis or other similar devices must carry and use a red or orange skier-down flag, at least 12 x 12 inches in size, whenever the towed person(s) is in the water.

Vessel displaying skier-down flag
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Online boating safety handbook last modified: July 15, 2008
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