Mekong River Hits Record Low Water Levels Amid Upstream Dam Operations

Downstream Nations Demand Transparency on Chinese Dam Releases

Water levels in the Mekong River fell to their lowest recorded point at the Chiang Saen monitoring station in northern Thailand on November 15, 2025, measuring just 1.82 meters — 0.4 meters below the previous record set in 2020. The Mekong River Commission confirmed that levels were critically low across all monitoring stations from Laos to the Vietnamese delta.

Thailand, Cambodia, Vietnam, and Laos issued a joint statement calling on China to release operational data from 11 mainstream dams on the upper Mekong, known in China as the Lancang River. China's cascade of dams holds an estimated 47 billion cubic meters of storage capacity, giving Beijing significant control over downstream water flows.

Impact on Communities

In Cambodia's Tonle Sap lake, Southeast Asia's largest freshwater body, water levels fell 35% below the seasonal average, devastating the annual fish migration that feeds 3 million people. The Cambodian Fisheries Administration reported catches down 60% from the five-year average.

In Vietnam's Mekong Delta, saltwater intrusion reached 80 kilometers inland in Ben Tre and Tra Vinh provinces, contaminating irrigation water for 1.2 million hectares of rice paddies. Vietnam's Ministry of Agriculture estimated agricultural losses of $450 million for the 2025-26 dry season.

Diplomatic Efforts

The Mekong River Commission's annual summit in Vientiane, scheduled for December, will feature the water crisis as its primary agenda item. MRC Secretary-General Anoulak Kittikhoun urged all parties to engage in "science-based dialogue rather than recrimination."

China's Ministry of Water Resources said in a statement that Lancang dam operations were "conducted in accordance with international standards and with due consideration for downstream impacts." Beijing shared limited hydrological data through the Lancang-Mekong Cooperation framework but has resisted calls for real-time operational transparency.

Climate and Infrastructure Factors

Researchers at the Stimson Center's Mekong Dam Monitor attributed 40% of the low flows to below-average rainfall linked to a developing La Nina pattern and 60% to upstream water retention. Since 2019, the center has used satellite imagery to track reservoir levels across the Chinese dam cascade.

Brian Eyler, director of the Stimson Center's Southeast Asia program, said the crisis underscored "the fundamental vulnerability of 60 million people who depend on a river system increasingly controlled by infrastructure rather than nature." The Mekong sustains the world's largest inland fishery, valued at $11 billion annually.