European Inland Waterway Transport (IWT) plays a crucial role in moving large volumes of cargo and goods across extensive inland water networks. It is a sustainable alternative that helps reduce road traffic emissions. In the context of climate change, IWT is both impacted by and contributes to environmental resilience. In this paper, we propose the application of ontology for decisionmaking in the context of climate change scenarios that could affect the IWT network. To achieve this objective, we have conceptualized an ontology, the so-called IWT2Onto, which models the IWT network as well as resilience and sustainability Key Performance Indicators (KPIs). We have used open data sources, such as EuRIS 3 , along with data coming from IWT partners to populate the ontology and the underlying Knowledge Graph with static and dynamic data. Finally, using an assessment framework, we demonstrate in a real-world scenario how our ontology-based approach can help monitor the IWT system via related KPIs and its potential to facilitate dynamic decision-making for IWT during flood scenarios. This integrated approach effectively demonstrates the use of advanced data-driven strategies in optimizing navigation and operational responses under challenging climate conditions.