To advance actionable knowledge production in the context of water struggles, this article identifies ways to strengthen transformative learning processes within riverine social movements. The complex challenges associated with water struggles point to an increasing need to explore ways in which these processes can be shaped and to promote changes in the worldviews that inform how water and riverine environments are perceived and structured. This study draws on the grassroots movement for the social-ecological regeneration of the Taquara Stream in Porto Alegre, Brazil. Research on this case has shown that the actions conducted by this movement fostered learning processes through the creation of innovative forms of involvement that brought together multiple actors. A panel of experts conducted an in-depth analysis of the learning practices observed in this case. This article discusses five aspects of the learning process, which have been identified by the experts, that are essential to expanding the transformative potential of water-related social movements: (1) building relationships of trust between actors, (2) building links with and between key actors in the process, (3) creating dialogue spaces that promote the co-creation of actionable knowledge, (4) engaging actors spontaneously, proactively, and co-responsibly in the process, and (5) bringing participatory research into local processes.