The document discusses a spatial decision support system (SDSS) and critical infrastructure resilience decision support system (CIR-DSS) created to help decision makers improve the resilience of critical infrastructure to flooding in Delaware. The SDSS integrates GIS and HAZUS-MH analyses to assess infrastructure vulnerability and risks. A case study on 2006 Delaware flooding is analyzed using the SDSS and other tools. While the SDSS provided useful spatial data and analyses, limitations in HAZUS-MH modeling of transportation infrastructure were identified. The SDSS results could be integrated with other systems to further decision making. Scenarios assessing mitigation strategies found investment in mitigation reduced long-term costs from future flood events.