2020 Louisiana Water Quality Integrated Report Appendix G-Section 303(d) List Appendix G: Louisiana's 2020 Section 303(d) List Final Submital to EPA - January 26, 2021 Description of Codes and Acronyms: Water Body Types: R = Rivers; L = Lakes; E = Estuaries; W = Wetlands; C = Coastal Waters Use Support Codes for Designated Uses: F = Fully supporting designated use N = Not supporting designated use Water Body Sizes: R = Miles; L = Acres; E = Square Miles; W = Acres; C = Miles I = Insufficient data to make reliable determination X = No data Designated Use PCR = Primary Contact Recreation (swimming) Descriptions: SCR = Secondary Contact Recreation (boating) Follow-up Data Comments: CTM Full: Lead = Follow-up ultra-clean metals sampling indicates full support FWP = Fish and Wildlife Propagation (fishing) DWS = Drinking Water Supply IR Category for Suspected Causes: IRC 5 = 303(d) List ONR = Outstanding Natural Resource IRC 5-Alt = 303(d) List but LDEQ will implement alternative corrective strategies OYS = Oyster Propagation IRC 5RC = 303(d) List but criteria revisions (Revise Criteria (RC)) are planned AGR = Agriculture IRC 4a = TMDL completed LAL = Limited Aquatic Life and Wildlife IRC 4b = Other corrective actions in place Impaired Water Use for IR Category Body Suspected Suspected Causes of for Suspected TMDL Suspected Sources of Subsegment Number Subsegment Description Type Size Cause Impairment Causes Priority Impairment PCR SCR FWP DWS ONR OYS AGR LAL LA010101_00 Atchafalaya River Headwaters and Floodplain-From Old W 74,857.0 N F F PCR FECAL COLIFORM IRC 5 L SOURCE UNKNOWN River Control Structure to Simmesport; includes Old River Diversion Channel, Lower Red River, Lower Old River LA010301_00 West Atchafalaya Basin Floodway-From Simmesport to W 220,276.0 N F N PCR FECAL COLIFORM IRC 5 L SOURCE UNKNOWN Butte LaRose Bay and Henderson Lake LA010501_00 Lower Atchafalaya Basin Floodway-From Whiskey Bay W 356,046.0 F F F N DWS COLOR IRC 5 L SOURCE UNKNOWN Pilot Channel at mile 54 to US-90 bridge in Morgan City; includes Grand Lake and Six-Mile Lake LA010601_00 Crow Bayou, Bayou Blue, and Tributaries R 28.2 F F N FWP DISSOLVED OXYGEN IRC 5 L AGRICULTURE LA010601_00 Crow Bayou, Bayou Blue, and Tributaries R 28.2 F F N FWP DISSOLVED OXYGEN IRC 5 L INDUSTRIAL POINT SOURCE DISCHARGE G 1 of 73 2020 Louisiana Water Quality Integrated Report Appendix G-Section 303(d) List Impaired Water Use for IR Category Body Suspected Suspected Causes of for Suspected TMDL Suspected Sources of Subsegment Number Subsegment Description Type Size Cause Impairment Causes Priority Impairment PCR SCR FWP DWS ONR OYS AGR LAL LA010601_00 Crow Bayou, Bayou Blue, and Tributaries R 28.2 F F N FWP DISSOLVED OXYGEN IRC 5 L ON-SITE TREATMENT SYSTEMS (SEPTIC SYSTEMS AND SIMILAR DECENTRALIZED SYSTEMS) LA010701_00 Bayou Teche-From Berwick to Wax Lake Outlet R 13.9 F F N N DWS COLOR IRC 5 L NATURAL SOURCES LA010701_00 Bayou Teche-From Berwick to Wax Lake Outlet R 13.9 F F N N FWP DISSOLVED OXYGEN IRC 5 L NATURAL SOURCES LA010901_00 Atchafalaya Bay and Delta and Gulf Waters to the State 3 E 405.6 F F N N OYS FECAL COLIFORM IRC 5 M NATURAL SOURCES mile limit LA010901_00 Atchafalaya Bay and Delta and Gulf Waters to the State 3 E 405.6 F F N N OYS FECAL COLIFORM IRC 5 M PACKAGE PLANT OR mile limit OTHER PERMITTED SMALL FLOWS DISCHARGES LA020101_00 Bayou Verret, Bayou Chevreuil, Bayou Citamon, and R 40.1 N F N F PCR FECAL COLIFORM IRC 5 L SEWAGE DISCHARGES IN Grand Bayou UNSEWERED AREAS LA020101_00 Bayou Verret, Bayou Chevreuil, Bayou Citamon, and R 40.1 N F N F PCR FECAL COLIFORM IRC 5 L WATERFOWL Grand Bayou LA020101_00 Bayou Verret, Bayou Chevreuil, Bayou Citamon, and R 40.1 N F N F PCR FECAL COLIFORM IRC 5 L WILDLIFE OTHER THAN Grand Bayou WATERFOWL LA020201_00 Bayou Des Allemands-From Lac Des Allemands to old R 7.1 F F N N FWP TURBIDITY IRC 5RC L HIGHWAYS, ROADS, US-90 (Scenic) BRIDGES, INFRASTRUCTURE (NEW CONSTRUCTION) LA020201_00 Bayou Des Allemands-From Lac Des Allemands to old R 7.1 F F N N FWP TURBIDITY IRC 5RC L NATURAL SOURCES US-90 (Scenic) LA020201_00 Bayou Des Allemands-From Lac Des Allemands to old R 7.1 F F N N FWP TURBIDITY IRC 5RC L SEDIMENT US-90 (Scenic) RESUSPENSION (CLEAN SEDIMENT) LA020201_00 Bayou Des Allemands-From Lac Des Allemands to old R 7.1 F F N N ONR TURBIDITY IRC 5RC L HIGHWAYS, ROADS, US-90 (Scenic) BRIDGES, INFRASTRUCTURE (NEW CONSTRUCTION) G 2 of 73 2020 Louisiana Water Quality Integrated Report Appendix G-Section 303(d) List Impaired Water Use for IR Category Body Suspected Suspected Causes of for Suspected TMDL Suspected Sources of Subsegment Number Subsegment Description Type Size Cause Impairment Causes Priority Impairment PCR SCR FWP DWS ONR OYS AGR LAL LA020201_00 Bayou Des Allemands-From Lac Des Allemands to old R 7.1 F F N N ONR TURBIDITY IRC 5RC L NATURAL SOURCES US-90 (Scenic) LA020201_00 Bayou Des Allemands-From Lac Des Allemands to old R 7.1 F F N N ONR TURBIDITY IRC 5RC L SEDIMENT US-90 (Scenic) RESUSPENSION (CLEAN SEDIMENT) LA020202_00 Lac Des Allemands L 16,596.0 F F N FWP DISSOLVED OXYGEN IRC 5 L NATURAL SOURCES LA020301_00 Bayou Des Allemands-From US-90 to Lake Salvador R 13.7 N F N N FWP TURBIDITY IRC 5 L FORCED DRAINAGE (Scenic) PUMPING LA020301_00 Bayou Des Allemands-From US-90 to Lake Salvador R 13.7 N F N N FWP TURBIDITY IRC 5 L SEDIMENT (Scenic) RESUSPENSION (CLEAN SEDIMENT) LA020301_00 Bayou Des Allemands-From US-90 to Lake Salvador R 13.7 N F N N ONR TURBIDITY IRC 5 L FORCED DRAINAGE (Scenic) PUMPING LA020301_00 Bayou Des Allemands-From US-90 to Lake Salvador R 13.7 N F N N ONR TURBIDITY IRC 5 L SEDIMENT (Scenic) RESUSPENSION (CLEAN SEDIMENT) LA020301_00 Bayou Des Allemands-From US-90 to Lake Salvador R 13.7 N F N N PCR FECAL COLIFORM IRC 5 L ON-SITE TREATMENT (Scenic) SYSTEMS (SEPTIC SYSTEMS AND SIMILAR DECENTRALIZED SYSTEMS) LA020301_00 Bayou Des Allemands-From US-90 to Lake Salvador R 13.7 N F N N PCR FECAL COLIFORM IRC 5 L PACKAGE PLANT OR (Scenic) OTHER PERMITTED SMALL FLOWS DISCHARGES LA020301_00 Bayou Des Allemands-From US-90 to Lake Salvador R 13.7 N F N N PCR FECAL COLIFORM IRC 5 L WILDLIFE OTHER THAN (Scenic) WATERFOWL LA020303_00 Lake Cataouatche and Tributaries L 9,978.0 F F N FWP TURBIDITY IRC 5 L SEDIMENT RESUSPENSION (CLEAN SEDIMENT) LA020303_00 Lake Cataouatche and Tributaries L 9,978.0 F F N FWP TURBIDITY IRC 5 L WATER DIVERSIONS LA020402_00 Bayou Lafourche-From ICWW at Larose to Yankee Canal R 15.5 N F N FWP DISSOLVED OXYGEN IRC 5 L PACKAGE PLANT OR (Estuarine) OTHER PERMITTED SMALL FLOWS DISCHARGES G 3 of 73 2020 Louisiana Water Quality Integrated Report Appendix G-Section 303(d) List Impaired Water Use for IR Category Body Suspected Suspected Causes of for Suspected TMDL Suspected Sources of Subsegment Number Subsegment Description Type Size Cause Impairment Causes Priority Impairment PCR SCR FWP DWS ONR OYS AGR LAL LA020402_00 Bayou Lafourche-From ICWW at Larose to Yankee Canal R 15.5 N F N PCR ENTEROCOCCUS IRC 5 L PACKAGE PLANT OR (Estuarine) OTHER PERMITTED SMALL FLOWS DISCHARGES LA020403_00 Bayou Lafourche-From Yankee Canal and saltwater R 23.4 N F F F PCR ENTEROCOCCUS IRC 5 L SOURCE UNKNOWN barrier to Gulf of Mexico (Estuarine) LA020501_00 Sauls, Avondale, and Main Canals R 7.8 F F N FWP CHLORIDE IRC 5 L FORCED DRAINAGE PUMPING LA020501_00 Sauls, Avondale, and Main Canals R 7.8 F F N FWP CHLORIDE IRC 5 L GOLF COURSES LA020501_00 Sauls, Avondale, and Main Canals R 7.8 F F N FWP CHLORIDE IRC 5 L LANDFILLS LA020501_00 Sauls, Avondale, and Main Canals R 7.8 F F N FWP SULFATE IRC 5 L FORCED DRAINAGE PUMPING LA020501_00 Sauls, Avondale, and Main Canals R 7.8 F F N FWP SULFATE IRC 5 L GOLF COURSES LA020501_00 Sauls, Avondale, and Main Canals R 7.8 F F N FWP SULFATE IRC 5 L LANDFILLS LA020501_00 Sauls, Avondale, and Main Canals R 7.8 F F N FWP TOTAL DISSOLVED IRC 5 L FORCED DRAINAGE SOLIDS (TDS) PUMPING LA020501_00 Sauls, Avondale, and Main Canals R 7.8 F F N FWP TOTAL DISSOLVED IRC 5 L GOLF COURSES SOLIDS (TDS) LA020501_00 Sauls, Avondale, and Main Canals R 7.8 F F N FWP TOTAL DISSOLVED IRC 5 L LANDFILLS SOLIDS (TDS) LA020601_00 Intracoastal Waterway-From Bayou Villars to Mississippi R 17.9 F F N FWP TURBIDITY IRC 5RC L IMPACTS FROM River (Estuarine) HYDROSTRUCTURE FLOW REGULATION/MODIFICAT ION LA020601_00 Intracoastal Waterway-From Bayou Villars to Mississippi R 17.9 F F N FWP TURBIDITY IRC 5RC L SEDIMENT River (Estuarine) RESUSPENSION (CLEAN SEDIMENT) LA020904_00 Wilkinson Canal and Wilkinson Bayou (Estuarine) R 19.5 F F F N OYS FECAL COLIFORM IRC 5 M NATURAL SOURCES LA020904_00 Wilkinson Canal and Wilkinson Bayou (Estuarine) R 19.5 F F F N OYS FECAL COLIFORM IRC 5 M WILDLIFE OTHER THAN WATERFOWL LA020905_00 Bayou Moreau (Estuarine) R 7.2 N F F F PCR ENTEROCOCCUS IRC 5 L SOURCE UNKNOWN LA020906_00 Bay Rambo (Estuarine) E 2.6 N F F F PCR ENTEROCOCCUS IRC 5 L NATURAL SOURCES LA020906_00 Bay Rambo (Estuarine) E 2.6 N F F F PCR ENTEROCOCCUS IRC 5 L SOURCE UNKNOWN LA021102_00 Barataria Basin Coastal Bays and Gulf Waters to the State E 282.9 N F N N FWP DISSOLVED OXYGEN IRC 5RC L UPSTREAM SOURCE 3 mile limit LA021102_00 Barataria Basin Coastal Bays and Gulf Waters to the State E 282.9 N F N N OYS FECAL COLIFORM IRC 5 M SOURCE UNKNOWN 3 mile limit G 4 of 73 2020 Louisiana Water Quality Integrated Report Appendix G-Section 303(d) List Impaired Water Use for IR Category Body Suspected Suspected Causes of for Suspected TMDL Suspected Sources of Subsegment Number Subsegment Description Type Size Cause Impairment Causes Priority Impairment PCR SCR FWP DWS ONR OYS AGR LAL LA021102_00 Barataria Basin Coastal Bays and Gulf Waters to the State E 282.9 N F N N PCR ENTEROCOCCUS IRC 5 L SOURCE UNKNOWN 3 mile limit LA021102_001 Fourchon Beach 1-Located within subsegment C 0.9 N PCR ENTEROCOCCUS IRC 5 L SOURCE UNKNOWN LA021102_00.