Region 15 Lower Rio Grande Flood Planning Region

This region begins at International Amistad Reservoir in Val Verde County, which separates the Upper and Lower Rio Grande regions, and extends to the Rio Grande Valley region near the Gulf of Mexico. It contains six major lakes/reservoirs, including two that border the U.S. and Mexico.

For a detailed map of Region 15, please visit the Texas Geographic Information Office (TxGIO) Flood Planning Regions Map Collection.

Go to Region 15 Lower Rio Grande RFPG External Host Website

Population Estimate (2019): 1,776,732

Approximate Area: 43,204 square miles

Approximate Stream Miles: 5,300

Approximate NFIP Claims (1975-2019): $173,104,689

Counties Represented:

• Brooks*
• Cameron
• Dimmit*
• Edwards*
• Hidalgo
• Jim Hogg*
• Kenedy*
• Kinney*
• Maverick*
• Starr
• Val Verde
• Webb*
• Willacy
• Zapata

*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):

• Brownsville
• Del Rio
• Eagle Pass
• Edinburg
• Harlingen
• Laredo
• McAllen
• Mission
• Pharr
• San Juan
• Weslaco

Major Lakes & Reservoirs:

• Anzalduas Channel Dam
• Casa Blanca Lake
• Delta Lake
• International Amistad Reservoir
• International Falcon Reservoir
• Loma Alta Lake
• Valley Acres Reservoir

Ecoregions of Texas Represented:

• Edwards Plateau
• Gulf Prairies
• South Texas Plains