Various kinds of activity in the river will be effective to have a connection between a river and neighborhood residents. Especially, it is very important that the river environment studies enable the people to learn nature and promotes the inter-generation exchange. In this study, the transition of river environmental management by residents and the relationship among activity contents are clarified. The factor analysis and potential assessment on the initiation of the river environment studies are performed in the first class rivers of Chugoku District. The results indicate that the elementary school and the cooperation in river basin greatly influence the initiation and continuation of the learning activities for the river. The potential map is useful for river administrator to show the river section that activity is easy to start.