Floodplain Management

Nassau Bay is located in southeastern Harris County. It is bordered to the west by the city of Webster, and to the north by the city of Houston. It is bordered south of Galveston by Clear Creek and to the southeast of Clear Lake, an arm of Galveston Bay. It is adjacent to the Johnson Space Center (JSC), which lies on the north side of Texas State Highway NASA Road 1 within the Houston city limits. A detailed map of the City of Nassau Bay is available here.

Floodplain Management


Dangerous flooding can occur with little warning. The Federal Emergency Management Agency (FEMA) provides official maps delineating both special hazard areas and high-risk zones within a community. Property owners, insurance agents and lenders can use these flood maps to determine flood insurance requirements and policy costs. Because flood risks change over time, FEMA and the National Flood Insurance Program (NFIP) work with communities, such as Nassau Bay, to identify and map flood risk on an ongoing basis.

Nassau Bay residents and businesses are encouraged to familiarize themselves with flood hazard information, using the FEMA Flood Map Service Center. This website will locate your official flood map, access a range of other flood hazard products and provide tools for understanding flood risk. Valuable information regarding stream and rain gauges from Clear Creek and Clear Lake is available from the Harris County Flood Warning System.

Additional information is provided by the Harris County Flood Control District utilizing a Flood Education Mapping Tool, which provides information regarding the boundaries of mapped floodplains in Harris County relative to residences, business and other structures.

To learn more about Floodplain Management in Nassau Bay, please review the Frequently Asked Questions & Answers provided by the Harris County Flood Control District. Select one of the following to view Frequently Asked Questions and Answers related to that topic.

For questions pertaining to development and construction of or improvements to a property in Nassau Bay, contact the Nassau Bay Building Department at (281)-336-6292 or via email at nb.permits@nassaubay.com.

Please visit our Resource Page for further information.