Abstract: Critical infrastructures (CIs) in urban areas or municipalities have evolved into strongly interdependent and highly complex networks. To assess risks in this sophisticated environment, classical risk management approaches require extensions to reflect those interdependencies and include the consequences of cascading effects into the assessment. In this paper, we present a concept for a risk model specifically tailored to those requirements of interdependent CIs. We will show how the interdependencies can be reflected in the risk model in a generic way such that the dependencies among CIs on different levels of abstraction can be described. Furthermore, we will highlight how the simulation of cascading effects can be directly integrated to consistently represent the assessment of those effects in the risk model. In this way, the model supports municipalities' decision makers in improving their risk and resilience management of the CIs under their administration.