100 Year Floodplain Houston Map. Any place with a 1% chance or higher chance of experiencing a flood each year is considered to have a high risk Explore geographic data with this interactive ArcGIS web application.
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A major flood occurs somewhere in Harris County about every two years Map Viewer Classic is a deprecated product and will be removed in Q1 of 2026
Those areas have at least a one-in-four chance of flooding during a 30-year mortgage. 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 Hurricane Harvey; Spring Floods 2016; Hurricane Ike 2008; Tropical Storm Allison 2001
. Consider opening this content in Map Viewer to ensure the best experience. Structures located in a 1 percent (100-year) floodplain have a minimum of a 1 percent chance of.
The "500Year" Flood, Explained Why Houston Was So Underprepared Harris County Texas Flood. 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 Any place with a 1% chance or higher chance of experiencing a flood each year is.