Transboundary rivers have remained one of the sources of contention and cooperation among states in international politics. The Mekong is one such river along which China and five Southeast Asian countries have organized their political, economic, and social lives. Studies examining the water politics of this river have argued that the lack of a comprehensive institution to govern this regional common pool resource and the growing power asymmetry between China, an upstream riparian state, and its Southeast Asian neighbors dampen the prospect for an effective governance of the river. Particularly, the economic rise of China and its concomitant increase in demand for energy and water resources has raised concerns about the negative impacts that this would have on the downstream countries. Examination of recent developments regarding the Mekong River suggests, however, that China has adopted a more collaborative approach by engaging in joint development projects and exchanging information and technology via existing sub‐regional and regional multilateral bodies since the early 2000s. The study concludes that this growing evidence of cooperation should be taken into consideration for a more comprehensive understanding of China's policy towards the Mekong River.