Guadalupe-Blanco River Authority Share: Government Guadalupe-Blanco River Authority Visit Website 933 East Court Street Seguin, TX 78155 (830) 379-5822 Facebook Twitter About About GBRA provides stewardship for the water resources in its ten-county statutory district, which includes Kendall, Comal, Hays, Caldwell, Guadalupe, Gonzales, DeWitt, Victoria, Calhoun & Refugio counties