100 Year Floodplain Houston Map. Consider opening this content in Map Viewer to ensure the best experience. Most of the flooding is in areas developed prior to the current understanding of flood potential and prior to regulations restricting construction in flood-prone areas
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Map Viewer Classic is a deprecated product and will be removed in Q1 of 2026 Most of the flooding is in areas developed prior to the current understanding of flood potential and prior to regulations restricting construction in flood-prone areas
Consider opening this content in Map Viewer to ensure the best experience. Consider opening this content in Map Viewer to ensure the best experience. Those areas have at least a one-in-four chance of flooding during a 30-year mortgage.
. Explore geographic data with this interactive ArcGIS web application. A 1 percent (100-year) floodplain, also known as a Special Flood Hazard Area on a Federal Emergency Management Agency (FEMA) Flood Insurance Rate Map (FIRM or floodplain map), is an area at risk for flooding from a bayou, creek or other waterway overflowing during a 1 percent (100-year) flood
. Any place with a 1% chance or higher chance of experiencing a flood each year is. It does not mean that the flood will occur every 100 years; rather it is the flood elevation that has a 1- percent chance of being equaled or exceeded each year.