Table of Contents

Download the PDF Version

It's the Law

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.

Divers Flag

A rectangular red flag with a white diagonal stripe is used on Idaho state waters.

Alfa Flag

A blue and white International Code Flag A (or Alfa flag) must be displayed on vessels on federally controlled waters.

Divers and Alfa flags
Divers and Alfa flags