Flash floods and stream crossings

Flash floods have killed more people in Hawaiʻi than high winds or hurricanes, often people crossing flooded streams. If it is raining hard or a Flood Watch or warning is out, stay out of streams and off flooded roads: Turn Around, Don't Drown.

• Many flash flood deaths in Hawaiʻi happened to people who crossed or fell into flooded streams.
• Water can rise fast even if it is not raining where you are; the rain may be falling up in the mountains.
• Do not cross a stream that is rising, muddy or fast. Wait for it to go down.
• Never drive through a flooded road.
• Flash floods can happen any month but are most common October through April.
• Check live alerts on Ask Hawaiʻi or the National Weather Service Honolulu office before a hike.

Sources: National Weather Service Honolulu: Hawaiʻi weather hazard statistics · National Weather Service Honolulu

Last checked Oct. 29, 2026. Hours, fees and rules can change, so confirm with the official source before you go.