: Intermediate Abstract: The 2013 Threat and Hazard Identification and Risk Assessment (THIRA) for the Commonwealth identified the need for a catastrophic urban flood plan. The need for such a plan was reinforced in March of 2016 after an emergency table top exercise was facilitated by Louisville MSD and the Louisville Metro EMA relating to a breach in the Louisville Metro Flood Protection System. Beginning in 2017, a collaborative effort between Louisville MSD, federal, state, local agencies, and private entities to develop such a plan as federal funding and technical services have been made available. The plan is in the final stage of development. The plan is being developed using river gauge levels to identify critical impacts to population, industry, critical infrastructure, and facilities in a catastrophic event to prepare response and mitigation strategies. This plan will be developed for Louisville Metro specifically, but then the framework will be made available for other cities in the Commonwealth and other river cities across the country. With flooding events that have occurred in the US over the last 15 years, the question is no longer if Louisville Metro will experience a catastrophic flooding event, but when it will experience one. The development of this plan will provide information to mitigate and appropriately respond in such an event and increase overall resiliency of our city and other cities in the Commonwealth and elsewhere.