Region 12 San Antonio Flood Planning Region
The Medina river originates in Northwestern Bandera county on the Edwards Plateau where it flows southeast to merge with the San Antonio River, flowing from its spring-fed headwaters in Bexar County, just southeast of the City of San Antonio. From there, the San Antonio River flows across the South Texas Plains largely unimpeded where it empties into the Guadalupe River just northwest of San Antonio Bay. Other streams within the basin include the Leon, Salado, Calaveras, and Cibolo creeks. This region crosses five ecoregions and is home to three major lakes and reservoirs.
For a detailed map of Region 12, please visit the Texas Natural Resources Information System (TNRIS) Flood Planning Regions Map Collection.
Population Estimate (2019): 2,225,430
Approximate Area: 4,422 square miles
Approximate Stream Miles: 4,206
Approximate NFIP Claims (1975-2019): $48,925,054
*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):
*indicates this city is partially within this RFPG and is also represented by at least one other RFPG
Major Lakes & Reservoirs:
Ecoregions of Texas Represented:
Regional Flood Planning Group Meeting Minutes & Updates
Please see the RFPG Meeting Schedule webpage for information on the past and upcoming meetings.