The sustainability of irrigated agriculture has been questioned both economically and environmentally. Evaluation of the performance of irrigation schemes helps to know the present status of the scheme and to apply possible measures for improvement. Irrigation scheme performance assessment is vital to evaluate the impacts of irrigation practices, to identify performance gaps and to improve system performances. However, the performance of Kitamewukia Small Scale Irrigation schemes was not assessed since its operation. Therefore, this study was carried out to evaluate the water delivery, on-farm water management and organizational performances of irrigation schemes. To undertake this study primary collected through field measurements and secondary data were collected from the secondary sources. CROPWAT 8.0 model and GIS software were used to analyze the data. The result of this study revealed that, average conveyance efficiencies 89.11 % and 83.48%, respectively, for lined and unlined main canals and the mean conveyance loss 0.05 (l/s/m) and 0.07 (l/s/m) for lined and unlined main canals. The application and storage efficiency was, respectively, 54.2% and 50.2%. Analyses of water-use showed that relative water supply and relative irrigation supply were 1.8 and 2.4 respectively. Output per unit irrigated area values of 63821.3ETB/ha was calculated at irrigation scheme. Furthermore, the output per unit command area of scheme is 79327.6ETB/ha. Water productivity factors such as, Output per unit irrigation water supplied and Output per unit water consumed values of 14.54ETB/m 3 , 15.4ETB/m 3 in irrigation scheme were calculated, respectively. The result of the physical indicators, which were irrigation ratio and sustainability of irrigated area, were found to be 0.80 and 1. Around 54.9% of gross return on investment was obtained. Unfair distribution of water was due to water scarcity and illegal water users as the beneficiaries responded. Generally, the scheme requires improvement measures. The overall efficiencies of irrigation scheme were found to be 43.3%. Keywords: efficiency, external factors, internal factors, conveyance efficiency and loss.