Flash Flood Sweeps Tourists at Mae Sa Waterfall; Visitors Safe, One Hospitalized

On the afternoon of August 15, 2026, a sudden flash flood struck Mae Sa Waterfall in Doi Suthep–Pui National Park, Mae Rim district, Chiang Mai province, sweeping some tourists away and causing minor injuries to several others. Park staff and local rescue teams quickly evacuated those affected to safety and sent one person to hospital for medical evaluation and treatment.

The incident occurred at about 3:00 p.m. while several visitors were walking and taking photos around the waterfall tiers. Some were caught off guard when a powerful surge of water rushed down from above. Park officials said the initial cause is believed to be heavy rain in the upper mountain area, which sharply increased stream flow and sent water, rocks, and debris downhill at high speed.

Doi Suthep–Pui National Park reported that both Thai and foreign visitors were at the site when the flood hit. On-duty staff heard calls for help and immediately carried out rescue operations. All tourists were brought to safe locations quickly; after initial medical checks one person was taken to hospital for further examination. Most injuries reported were abrasions and mild shock. There were no fatalities.

The incident highlights the risks of visiting natural areas where weather can change rapidly. Park authorities warned that even if skies look clear in lower areas, heavy rain on mountaintops or in upstream catchments can trigger unexpected flash floods. The park plans to strengthen warning measures and weather checks before allowing visitors into the area, post warning signs at risky locations, and increase patrols during the rainy season.

Regarding impacts on local communities and tourism, the president of the Chiang Mai Local Guides Association said tour operators must clearly inform customers about the risks and safety measures, and prepare emergency plans for flash-flood situations. Short-term loss of confidence may cause visitors to avoid waterfalls during heavy-rain periods, but clear safety management can help restore confidence.

Park officials also urged visitors not to be complacent: check weather apps or ask staff before entering the area, avoid standing or playing near waterfall edges when dark clouds gather, and consider choosing safer destinations for children or elderly companions on uncertain-weather days. The incident underlined the need to improve warnings and cooperation among local authorities, operators, and tourists to prevent future accidents.