Floodplain Information

All development in the unincorporated areas of McLennan County must comply with the county's flood damage prevention order.

McLennan County provides floodplain information in order to determine if a certain tract of land is within the 100-year floodplain. You will need to provide the Engineer's Office with a survey or drawing that shows the specific tract, the fronting road, and the nearest road intersection.

If you need a drawing of this nature, contact the Map Department by calling 254-757-5067.

Once a drawing has been provided, the Engineer's Office will make a determination as to whether the property lies within the floodplain.

***On February 15, 2018, McLennan County received from The Department of Homeland Security's Federal Emergency Management Agency (FEMA) preliminary copies of the Flood Insurance Rate Maps (FIRM) and Flood Insurance Study (FIS) Report for McLennan County (see attached letter from FEMA).

These Revised FIRMs may be reviewed at the following link:

We encourage citizens to review these flood hazard maps and report their concerns over any noted errors or discrepancies in the revised portions of these maps.  Should you identify any errors or discrepancies, please report your concerns in writing to the following address:

McLennan County
℅ County Engineer
215 N. 5th St. Ste. 130
Waco, TX 76701

Be sure and provide supporting documentation with your claim.  Provide your contact information in case our office needs to contact you to receive clarification or additional information.

The attachment below is the Lake Whitney (Hill and McLennan Counties) presentation from the CCO meeting help on April 17, 2018.  There are links in the attachment to additional information including the "Newly Mapped" eligibility that apply to both pre-FIRM and post-FIRM structures.  The communities listed in red on slide 8 and 9 will be having a 90 day appeal period.  The remaining communities listed in black will have a 90 day comment period.


FEMA did not receive any appeals of the proposed flood hazard determinations.  In addition, any comments received have been resolved.  Therefore, FEMA has finalized the modified flood hazard information and revised map panels will become effective December 20, 2019.  Be sure and use the new suffix code found on all revised FIRM panels for all future insurance policies and renewals.

FEMA Changes 2008 to 2019 Map

FEMA LTR Effective 12-21-2019
19-FEMA Revised Flood Insurance Study materials for McLennan Co 0724


LOMR-Letter-Effective-2020-5-19-The-Parks-FIRM-No-48309C0525C-City of McGregor


Floodplain Order & Permit

Residents of McLennan county can click on the links below to find out if they live or will be living in a location considered to be floodplain, otherwise known as the Special Flood Hazard Area (SFHA).  If the area you are interested in is considered floodplain, you will likely be required by your mortgage company to acquire flood insurance.

Flood Insurance Rate Maps (FIRMS):


Approximate Elevations of "A-Zones":


FEMA Changes 2008 to 2019

FEMA Changes 2008 to 2019 Map

Ex: Flood Insurance Rate Map


Ex: Approximate Elevations in "A-Zones"