The risk of the catastrophic flooding that struck Texas Hill Country as people slept on July 4 and left at least 120 dead was potentially underestimated by federal authorities, according to an ABC News analysis of Federal Emergency Management Agency data, satellite imagery and risk modeling.

The FEMA Flood Map Service Center offers an interactive map that allows anyone in the U.S. to enter their address and see if they live in a designated flood zone. The tool can also be used to explore other areas, making it helpful for those planning a move, managing a rental property or checking on family or friends in another region.

There are questions over why oversight was eased at Mystic Camp as it expanded in a hazardous floodplain, the AP reported.