Floodplain Protection information

The City of Nassau Bay is committed to providing its citizens with the knowledge and resources they can use to protect themselves and their property from flood hazards. Education, preparedness, and prevention are valuable and proven tools that help communities become resistant to natural disasters.

Regardless of where you live, you are at risk for flooding, and Nassau Bay’s location on the Gulf Coast leaves it especially vulnerable to tropical storms and other flood-related events. The information and links connected to this page have been created to serve as an “all inclusive” source for property owners in Nassau Bay in order to increase awareness about flood hazards.

The Flood Hazard

A flood is an overflow of storm water onto normally dry land caused by rising water in an existing waterway, such as a river, stream or drainage ditch. When it floods in Nassau Bay, it is typically a result of heavy rain overwhelming Clear Creek or storm surge from Galveston Bay.  A property’s risk of flooding may depend on where it is located relative to these two flooding sources. Flood Insurance Rate Maps (FIRMs) are issued by FEMA to identify different levels of flood risks. You can find out your property’s flood risk by searching your address on the Houston-Galveston Area Council’s interactive flood map. For homes that were built prior to when the city received its first FEMA flood map, it may be helpful to have access to the historical FIRMs to know what flood zone was in effect at the time of construction. Knowing this information can be critical if there is a dispute with a mortgage lender or insurance agent.  FEMA's Map Service Center is a good resource for both current and historical maps. 

The Harris County Flood Warning System consists of 188 rain gauges placed in different areas of the county. Rain gauge 170 is located at Clear Creek and Nassau Bay, and monitors rain levels at different intervals ranging from the past 15 minutes to one year.  Users can sign up for real-time alerts on the site and can also view inundation maps from Nassau Bay’s biggest flooding events such as Hurricane Ike in September of 2008 and Tropical Storm Allison in June of 2001.