Watersheds are vital for human life. Management has been carried out for a long time, but many are still in the critical category. The watershed is a complex nature-human system involving various interacting biogeophysical and socio-economic cultural components. Degradation of forest, soil, and water resources, as well as population pressure, has led to a decrease in watershed sustainability, and this is one of the biggest obstacle to sustainable watershed management in most developing countries in the humid tropics. This research aims to create a concept for a sustainable watershed management model. The research method consists of two stages. The first concept development stage is based on theoretical studies and research results on watershed management and sustainability. The second stage is concept improvement based on input from stakeholders such as BPDASHL Brantas Sampean, Perum Jasa Tirta I, and the Brantas Water Resources Office. The research results produced a concept for a sustainable watershed management model. Management is based on a sustainability index with a continuity planning, implementation, and evaluation cycle.