Flood risk assessment is crucial for effective water resource management and flood mitigation strategies. This study focuses on detecting and classifying flood risk in the Rideau River basin, located in eastern Ontario, Canada, into four distinct classes. The most significant flood occurred in 2019, surpassing a 100-year flood event, and serves as a stark reminder of how climate change impacts our environment. Considering the limitations of machine learning (ML) models, which heavily rely on historical data used during training, they may struggle to accurately predict such “non-experienced” or “unseen” floods that were not encountered during the training process. To tackle this challenge, our study has utilized a combination of numerical modeling and ML to create an integrated methodology. A comprehensive dataset of river flow discharge was generated using a numerical model, encompassing a wide range of potential future floods. This synthetic dataset ensures that the ML model is trained on a diverse array of scenarios, enhancing its ability to predict flood risks accurately, even for events outside the historical record. The AI model classifies flood risk into four categories: low, moderate, high, and very high. These classifications are based on various factors, including river discharge, precipitation, and temperature data. The integration of AI with numerical modeling provides a robust framework for flood risk assessment, enabling more accurate predictions and better-informed decision-making. The findings highlight the importance of using advanced modeling techniques to address the limitations of traditional ML models in flood prediction. By incorporating a wide range of potential future floods into the training dataset, the study improves the model's ability to predict and classify flood risks under changing climatic conditions. The study underscores the need for adaptive measures to mitigate the increasing flood risks posed by climate change, ensuring the resilience and safety of vulnerable communities along the Rideau River.