100 Year Floodplain Houston Map. Consider opening this content in Map Viewer to ensure the best experience. 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.
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Consider opening this content in Map Viewer to ensure the best experience. Any place with a 1% chance or higher chance of experiencing a flood each year is considered to have a high risk
Hurricane Harvey; Spring Floods 2016; Hurricane Ike 2008; Tropical Storm Allison 2001 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. 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
. Map Viewer Classic is a deprecated product and will be removed in Q1 of 2026 Hurricane Harvey; Spring Floods 2016; Hurricane Ike 2008; Tropical Storm Allison 2001
. Those areas have at least a one-in-four chance of flooding during a 30-year mortgage. 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.