The National Park Service warns are visitors to be careful when visiting the park:
Haleakalā National Park is a changing landscape with inherent and unpredictable natural hazards. This landscape is subject to constant change from natural forces including erosion, weather, earthquakes, and currents. The National Park Service has limited ability to monitor and no ability to control these forces. Obey all posted warnings and staff guidelines.
Be aware of the following hazards:
Trails and pools:
- Flash flooding (water can rise as fast as 4 feet in 10 minutes resulting in people washed out to sea and drowning)
- High water and flow
- Slippery rocks
- Rock falls (in gulches and below waterfalls)
- Fall hazards (from overlooks, ledges, jumping, and diving)
- Water quality (Leptospirosis, E. coli)
- Shore break
- Rip currents
- Rough surf
- Strong currents
Remember: In the event of an injury, medical assistance can take up to one hour to arrive from the nearest towns.
Flash Flood Video
Flash Floods are a real danger in the area. This video demonstrates how fast they can come and go.