The development of irrigation systems has long been recognized as an important tool to encourage economic growth and rural development in Ethiopia, as well as a foundation for food security and poverty reduction. Irrigation development receives a lot of attention, but little attention is paid to its sustainability. This study assesses the sustainability of Amiba Garno small scale irrigation scheme, located in Gondar zuriya woreda. This study aims to identify sustainability level of the scheme from socio-cultural, environmental, physical, economical and institutional aspect. To achieve these objectives, structured household survey questionnaires, semi-structured interviews, group discussions, field observations and literature were used. Physical and technical performance indicators, maintenance indicators, stability of the system, environmental protection, productivity of the scheme and institutional management structure were also selected to indicate scheme operation and management practices. Based on the Yes or No answers of the sampled households, sustainability rated scales of each category were calculated. Finally, the average value of all categories was considered the scheme sustainability index. From the data analysis, shortage of irrigation land is the first problem for the farmers. The unequal distribution of irrigation water to their plots is also a major issue. Siltation of the head work and apron damage is also a series issue that needs immediate solution. Generally, the scheme's sustainability index was 1.53, a value approaching unsustainable condition. This is due to poor institutional and management structures and low scheme maintenance. To improve the economic and environmental sustainability of the scheme, institutional support, training of farmers on improved crop production and water management issues, regular supervision and monitoring of scheme activities are essential. Key Word: - Sustainability, Irrigation, Indicator