The Cross Watershed Network (XWN) began as a regional network that connected watershed practitioners (practitioners) across watersheds in the Southwest U.S. through information sharing, collective capacity building, and collaboration. Members of the XWN Steering Committee wrote this case study to provide “lessons learned” for others who are setting up and implementing communities of practice and peer- learning networks. The study outlines XWN’s vision and accomplishments, approach to peer-learning and managing the network, and recommendations for future efforts.