Region 6 San Jacinto Flood Planning Region

As the San Jacinto River and its many contributing creeks and bayous traverse south from the Huntsville area, its waters cross through the Piney Woods ecoregion and the Sam Houston National Forest. The river then flows across the Gulf Prairies to Galveston Bay. There are eight major lakes and reservoirs in the San Jacinto river basin, and it is the second most populated flood planning region which is also home to the fourth largest city in the United States: Houston.

For a detailed map of Region 6, please visit the Texas Geographic Information Office (TxGIO) Flood Planning Regions Map Collection.

Go to Region 6 San Jacinto RFPG External Host Website

Population Estimate (2019): 6,297,609

Approximate Area: 5,089 square miles

Approximate Stream Miles: 3,696

Approximate NFIP Claims (1975-2019): $11,661,576,868

Counties Represented:

• Brazoria*
• Chambers*
• Fort Bend*
• Galveston*
• Grimes*
• Harris*
• Liberty*
• Montgomery
• San Jacinto*
• Walker*
• Waller*

*indicates this county is partially within this RFPG and is also represented by at least one other RFPG

Major Cities (Population greater than 25,000):

• Alvin*
• Atascocita
• Baytown
• Channelview
• Conroe
• Deer Park
• Friendswood
• Galveston
• Houston
• Huntsville*
• La Porte
• League City
• Mission Bend
• Missouri City*
• Pasadena
• Pearland
• Spring
• Sugar Land*
• Texas City
• The Woodlands

*indicates this city is partially within this RFPG and is also represented by at least one other RFPG

Major Lakes & Reservoirs:

• Addicks Reservoir
• Barker Reservoir
• Gulf Coast Water Authority Reservoir
• Lake Conroe
• Lake Houston
• Lewis Creek Reservoir
• Mustang Lake East/Mustang Lake West
• Sheldon Reservoir

Ecoregions of Texas Represented:

• Blackland Prairie
• Gulf Prairies
• Piney Woods
• Post Oak Savanah