Groundwater Availability Models Download GAM files Download Other Project Files Major Aquifers Carrizo-Wilcox Carrizo-Wilcox Aquifer (northern portion) GAM Carrizo-Wilcox Aquifer (central portion) GAM Carrizo-Wilcox Aquifer (southern portion) GAM Edwards (Balcones Fault Zone) Edwards (BFZ) Aquifer (northern segment) GAM Edwards (BFZ) Aquifer (Barton Springs segment) GAM Edwards (BFZ) Aquifer (San Antonio segment) GAM Edwards-Trinity (Plateau) Edwards-Trinity (Plateau) and Pecos Valley Aquifers GAM Gulf Coast Gulf Coast Aquifer System (central and southern portions) GAM Gulf Coast Aquifer System (northern portion) GAM Gulf Coast Aquifer System (central portion) GAM Gulf Coast Aquifer System (southern portion) GAM Hueco-Mesilla Bolsons Mesilla Bolson Aquifer GAM Hueco Bolson Aquifer GAM Ogallala High Plains Aquifer System GAM Pecos Valley Edwards-Trinity (Plateau) and Pecos Valley Aquifers GAM Seymour Seymour and Blaine Aquifers GAM Seymour Aquifer in Haskell, Knox, and Baylor Counties GAM Trinity Trinity (northern portion) and Woodbine Aquifers GAM Trinity (southern portion) Aquifer GAM - [previously Trinity (Hill Country)] Minor Aquifers Blaine Seymour and Blaine Aquifers GAM Blossom Blossom Aquifer GAM Bone Spring-Victorio Peak Bone Spring-Victorio Peak Aquifer GAM Brazos River Alluvium Brazos River Alluvium Aquifer GAM Capitan Reef Complex Capitan Reef Complex Aquifer GAM Cross Timbers Cross Timbers Aquifer GAM Dockum High Plains Aquifer System GAM Edwards-Trinity (High Plains) High Plains Aquifer System GAM Ellenburger-San Saba Llano Uplift Aquifer System GAM Hickory Llano Uplift Aquifer System GAM Igneous West Texas Bolsons and Igneous Aquifer West Texas Bolsons (Wild Horse Flat, Michigan Flat, Ryan Flat, and Lobo Flat) and Igneous Aquifers GAM Lipan Aquifer Lipan Aquifer GAM Marble Falls Llano Uplift Aquifer System GAM Marathon Marathon Aquifer GAM Nacatoch Nacatoch Aquifer GAM Queen City Carrizo-Wilcox Aquifer (northern portion) GAM Carrizo-Wilcox Aquifer (central portion) GAM Carrizo-Wilcox Aquifer (southern portion) GAM Queen City and Sparta Aquifers GAM Rita Blanca High Plains Aquifer System GAM Rustler Rustler Aquifer GAM Sparta Carrizo-Wilcox Aquifer (northern portion) GAM Carrizo-Wilcox Aquifer (central portion) GAM Carrizo-Wilcox Aquifer (southern portion) GAM Queen City and Sparta Aquifers GAM West Texas Bolsons West Texas Bolsons and Igneous Aquifer West Texas Bolsons (Wild Horse Flat, Michigan Flat, Ryan Flat, and Lobo Flat) and Igneous Aquifers GAM West Texas Bolsons (Red Light, Green River, and Eagle Flat) Aquifer GAM West Texas Bolsons (Presidio and Redford Bolsons) Aquifer GAM Woodbine Trinity (northern portion) and Woodbine Aquifers GAM Yegua-Jackson Yegua-Jackson Aquifer GAM