They must always be leashed. Lock valuables in the trunk or out of sight in your car or take them with you. Before going out on the water check weather forecasts and look for storm warning flags at marinas. If a storm breaks while you are out, seek shelter in a protected cove immediately and wait until the storm passes. High winds can spring up quickly, creating waves as high as six feet.
Lightning is also a hazard on open water.
Alcohol, drugs, and water don't mix. The chance of an accident increases as your ability to react, both mentally and physically, is impaired. Most water-related deaths at Lake Mead NRA involve alcohol or drug use. Always approach the shore with caution and watch for shallows and submerged debris. Never let a passenger ride on the bow of the boat.