The objective of this study was to assess the performance of irrigation projects with specific objectives of assessing the technical evaluation and contribution of institutional and support service in small-scale irrigation schemes in West Gojam, Tis-Abay and Maji kebelies. The technical evaluation has been done by using selected performance indicators that include conveyance efficiency, application efficiency, distribution efficiency, irrigation system efficiency and dependability of irrigation interval and sustainability of irrigating command areas. Institutional and support services were also investigated through a questionnaire to the irrigation water users associations. Field observation, interviewing users, discharge measurements in the canals, determination of moisture contents of the soil before and after irrigation were some of the activities along with other data collections. According to the results, the conveyance efficiency of main canal, secondary canal1 and secondary canal2 was 87.86% at 1500m canal length, 76.75% at 670m canal length and 74.88% at 750m canal length respectively. The application efficiency values vary in the ranges from 49.14% to 60.4%. The irrigation transmission efficiency and dependability of Mendel irrigation scheme were 64.43% and 1.73 respectively and the overall irrigation efficiency was 35% (poor efficiency). The sustainability of the irrigated area in the scheme is 121.25% indicates that spreading of irrigation area caused to water shortage. Conflict among users is severe due to scarce water use computation and institutional and support services contributions to the beneficiaries were low. The study showed that the projects are performing below the required standard. Therefore, the concerned institutions and beneficiary farmers together with the water users association need to take measures to improve the performance of the project like canal lining and maintenance of farm structures.