The Corps of Engineers has an online tool that predicts which areas will be impacted by the 500-year flooding event, meaning there's a 0.2 percent chance flooding could occur every year.
Steps to use the online tool:
1) Follow this link to go to the Corps' website
2) Click on "Inundation Forecast for 0.2% Event"
3) Type in your address
This tool is a projection of the potential flooding, please keep this in mind as flooding patterns may change.
The tool is a great way of visualizing how wide the river may reach, but it's impossible to know for sure where the river will go. Also, make sure to keep in mind that the map does not detail how deep the water will be in those areas.