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This case study of the Yali Falls Hydropower Dam in the Vietnamese portion of the Sesan River Basin demonstrates a range of institutional and political challenges encountered in the assessment of large-scale infrastructure projects with transboundary impacts. These challenges include the failure to implement standard international planning processes and the failure to follow due process in dam planning, construction and operation, despite having received funding for international expertise that could have enabled Vietnam to implement such standards. Weak technical and financial capacity on the part of the downstream country, Cambodia, has allowed the politically dominant upstream country, Vietnam, to impose its national interests on downstream communities in Vietnam and Cambodia. A transboundary impact assessment has only been implemented many years after construction was completed.