Rivers and dams are increasingly contested venues where knowledge pluralism is critical for effective governance. To navigate change, decision-makers can adopt culturally-sensitive interventions to address the needs of diverse stakeholders and rights holders. Calls for Indigenous flows have become important as dam operators seek to renew their legal and social licenses to operate. Knowledge pluralism is needed to enhance decision-making about flows that better address complexity and change to Indigenous livelihoods and cultural practices. However, leveraging diverse knowledge types to inform these interventions is not simply a matter of changing management practice. Power relations can constrain knowledge pluralism. We contribute an empirical example that links power in a decision-making process about a dam in Saskatchewan, Canada, to the losses experienced by downstream Indigenous communities. This paper operationalizes power to illustrate its methodological utility and documents the interconnected losses, experienced by resources users, resultant from the marginalization of Indigenous knowledge.