A landslide on the Umphang-Mae Sot road has damaged over 40% of the traffic surface, leaving only one lane open. If the slide worsens, there are concerns it will affect the opening of Thi Lo Su Waterfall on 1 September 2026.
At 16:30 on 27 August 2026, reporters confirmed a landslide occurred between kilometers 105 and 106, near the junction leading to Ban Mae Klong Yai, Mokro Subdistrict, Umphang District, Tak Province. The slide damaged more than 40% of the road surface, creating a large cavity beneath the road. The soil, saturated with water, slid down the ravine in large amounts.
If the rain continues and the road's load-bearing capacity decreases, heavy vehicles crossing this point could accelerate the collapse of the soil beneath the road surface.
With one side of the road collapsed into a ravine and the other against a mountain, any serious problem would likely require a lengthy repair period. Currently, Department of Highways vehicles are stationed on site, preparing repair plans for the road.
If the damage increases by another 20%, affecting the opposite lane, the likelihood of closing the Mae Sot-Umphang road for repairs is very high, causing significant impacts. This is especially concerning as Thi Lo Su Waterfall in the Umphang Wildlife Sanctuary is scheduled to reopen to visitors on 1 September 2026. The situation will also affect many local livelihoods. Travelers are urged to exercise caution, particularly heavy trucks with 10 wheels or more, which should be especially careful when passing the affected area.