Oklahoma Groundwater Resources Major and Minor Aquifers of Oklahoma SFA NN NCO Vr NOP Og Ch NC VA CG Major Alluvial Aquifers Minor Alluvial Aquifers Ar Name (Label) Name (Label) Ci EIT MN Arkansas River (Ar) Ashland Isolated Terrace (AIT) FIT Bo Rb Canadian River (Ca) Beaver Creek (BC) IIT Vr SN Cimarron River (Ci) Cache Creek (CC) Og Enid Isolated Terrace (EIT) Chikaskia River (Ch) ER Gerty Sand (GS) Fairview Isolated Terrace (FIT) Ar North Canadian River (NC) Haworth Isolated Terrace (HIT) LIT North Fork of the Red River (NFR) Isabella Isolated Terrace (IIT) Red River (Re) Little River (Li) NC Og RS Salt Fork of the Arkansas River (SFA) Loyal Isolated Terrace (LIT) Wa GW VA ECO Salt Fork of the Red River (SFR) Middle Neosho River (MN) Tillman Terrace (TT) Northern Neosho River (NN) NC Washita River (Wa) Southern Neosho River (SN) EC Ca NC Ca Ar Verdigris River (Vr) NFR WO Major Bedrock Aquifers Minor Bedrock Aquifers SO Wa Name (Label) Name (Label) Pe Antlers (An) Boone (Bo) SFR AT Arbuckle-Simpson (AS) Broken Bow (BB) Wa GS AIT Arbuckle-Timbered Hills (AT) Cherokee Group (CG) PH Blaine (Bl) East-Central Oklahoma (ECO) Bl PO AT BC Pe Elk City (EC) 8 8 El Reno (ER) Ki Garber-Wellington (GW) 8 8 Hennessey - Garber (HG) AS AS TT CC 8 8 8Ogallala (Og) Holly Creek (HC) HG PM Roubidoux (Rb) Kiamichi (Ki) An 8 8 8Rush Springs (RS) - - -Marietta (Ma) Re BB - - - Vamoosa-Ada (VA) North-Central Oklahoma (NCO) HC Northeastern Oklahoma Pennsylvanian (NOP) Wb Li Pennsylvanian (Pe) Re Ma Te Re Pine Mountain (PM) Re Re HIT Base Layers Post Oak (PO) Potato Hills (PH) Counties *Major groundwater basin (aquifer) is defined as a distinct underground body of water overlain by contiguous land and having substantially the same Southwestern Oklahoma (SO) geological and hydrological characteristics and from which groundwater wells yield at least fifty (50) gallons per minute on the average basinwide Texoma (Te) if from a bedrock aquifer and at least one hundred fifty (150) gallons per minute on the average basinwide if from an alluvium and terrace aquifer, Western Oklahoma (WO) or as otherwise designated by the Board. 8 8 Woodbine (Wb) *Minor groundwater basin (aquifer) is defined as a distinct underground body of water overlain by contiguous land and having substantially the same geological and hydrological characteristics and which is not a major groundwater basin. 0 . 50 Miles For more information please visit the OWRB's web site at: ( http://www.owrb.ok.gov ).