<![CDATA[The maintenance of the Ayung River aims not only to maintain the cleanliness and smooth flow of the river itself, but also as part of a broader environmental conservation effort to create a more environmentally friendly and sustainable city. This study aims to identify and assess risks in the implementation of the Tukad Ayung river maintenance project, determine dominant risks and their acceptance levels, and formulate appropriate mitigation and risk ownership strategies to minimize potential impacts on project cost, time, and quality. The study employed a mixed-method approach combining qualitative risk identification with quantitative risk assessment using probability-impact analysis based on ISO 31000:2018. Brainstorming and questionnaires were selected as data collection techniques, with 26 respondents selected using purposive sampling. The results identified 15 valid risks consisting of 9 unacceptable risks (60%) and 6 undesirable risks (40%). The dominant risk was tidal seawater conditions in downstream areas, which obtained the highest probability-impact score of 25 and was categorized as an unacceptable risk requiring immediate mitigation measures. The mitigation strategies implemented included risk reduction, risk transfer, and risk avoidance approaches. Mitigation for this dominant risk involves obtaining tidal seawater level data from Benoa Harbor to optimize downstream work scheduling and implementing a combination of concrete culvert and cyclope concrete foundations to enhance structural resistance in estuary areas. The largest allocation of risk ownership is assigned to the contractor, covering 8 identified risks. The findings contribute to improving risk mitigation planning and decision-making for urban river maintenance projects in Indonesia.]]>
