The Federal Emergency Management Agency (FEMA) has approved a Letter of Map Revision affecting a tributary in the Greens Bayou watershed near the Veterans Memorial Drive area.

The revision, identified as FEMA Case No. 26-06-0568P, affects Greens Bayou tributary P147-00-00. FEMA issued the revision on September 10, 2026, with an effective date of January 25, 2027, following the required appeal period.

What is a Letter of Map Revision?

A Letter of Map Revision, or LOMR, is an official change to FEMA’s existing flood hazard maps based on updated engineering or technical information. Depending on the revision, a LOMR can modify information such as floodplain or floodway boundaries or flood risk zones.

The affected waterway, P147-00-00, is an unnamed tributary to Greens Bayou.

Why Does This Matter?

FEMA flood maps are used to communicate flood risk and can also play a role in flood insurance requirements and development standards. Keeping this information current helps residents, property owners and local agencies make decisions using the latest available flood risk data.

The revision is not yet effective. FEMA’s process includes a 90-day period during which interested parties may request reconsideration based on scientific or technical data. After that period and the resolution of any appeals, the revised information is scheduled to take effect January 25, 2027.

What You Can Do

Residents and property owners who want to see whether the revision affects an area of interest can search Case No. 26-06-0568P through FEMA’s Map Service Center.

Anyone seeking reconsideration of the determination must submit scientific or technical information during FEMA’s appeal period.

For additional flood risk information and mapping resources, visit FEMA’s Map Service Center or explore Harris County Flood Control District resources at hcfcd.org.