This report presents a case study project of collaborative stream restoration work with installing timber log structures by citizens, researchers, students and administrative officer in Kamisaigo river. In order to reveal effects of this collaborative restoration work, questionnaire survey was conducted to citizen participants (=elementary students).

Following results were obtained.

Following results were obtained.

· Installed timber log structures work in safety and provide precious habitat for some aquatic species

· Collaborative stream restoration work create an intergenerational connection between citizens

· Citizens became more careful against Kamisaigo river than before

· Citizens’ interest for river management work was heightened.

· Citizens’ awareness about river environment was heightened