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- Assessment Summary
- Causes of Impairment
- Probable Sources Contributing to Impairment
- TMDL Alternatives by Cause of Impairment
- Cumulative TMDLs by Pollutant
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Louisiana, Atchafalaya Watershed
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Assessment Summary for Reporting Year 2006
Louisiana, Atchafalaya Watershed
Description of this table
Click here to list Threatened and Impaired Waters Only
Click here to list Threatened and Impaired Waters Only
| NOTE: Click on the underlined "Waterbody Name" to view a Waterbody report. | ||||||||
| Waterbody Name | Waterbody ID | Location | Map | Waterbody Type | Size | Units | Status | State TMDL Development Status |
|---|---|---|---|---|---|---|---|---|
| Atchafalaya Bay And Delta And Gulf Waters | LA010901_00 | Atchafalaya Bay And Delta And Gulf Waters To State Three-Mile Limit | Waterbody Map | Estuary | 391.0 | Square Miles | Impaired | TMDL needed |
| Atchafalaya River Headwaters And Floodplain | LA010101_00 | Atchafalaya River Headwaters And Floodplain-Old River Control Structure To Simmesport (Includes Old River Diversion Channel, Lower Red River, Lower Old River) | Waterbody Map | Wetlands, Freshwater | 86,400.0 | Acres | Good | |
| Atchafalaya River Mainstem - Simmesport To Whiskey Bay | LA010201_00 | Atchafalaya River Mainstem-Simmesport To Whiskey Bay Pilot Channel At Mile 54 | Waterbody Map | River | 51.0 | Miles | Good | |
| Bayou Maringouin - Headwaters To E Atchafalaya Basin Levee | LA120111_00 | Bayou Maringouin-Headwaters To East Atchafalaya Basin Levee | Waterbody Map | River | 18.0 | Miles | Impaired | TMDL needed |
| Bayou Teche - Berwick To Wax Lake Outlet | LA010701_00 | Bayou Teche-Berwick To Wax Lake Outlet | Waterbody Map | River | 14.0 | Miles | Impaired | TMDL alternative |
| Big Alabama - Located Within La010401_00 | LA010401_001 | Big Alabama - Located Within Subsegment La010401_00. This Unit Is Added For Advisory Tracking Purposes Only And Is Not A Subsegment As Defined By Lac 33:Ix.1123.A. Et Seq. No Other Assessment Is Made For This Waterbody. | Waterbody Map | River | 13.1 | Miles | Impaired | TMDL needed |
| Crow Bayou, Bayou Blue And Tributaries | LA010601_00 | Crow Bayou, Bayou Blue And Tributaries | Waterbody Map | River | 18.0 | Miles | Impaired | TMDL needed |
| East Atchafalaya Basin And Morganza Floodway South To I-10 | LA010401_00 | East Atchafalaya Basin And Morganza Floodway South To I-10 Canal | Waterbody Map | Wetlands, Freshwater | 195,840.0 | Acres | Impaired | TMDL needed |
| Henderson Lake | LA010301_001 | Henderson Lake - Located Within Subsegment La010301_00. This Unit Is Added For Advisory Tracking Purposes Only And Is Not A Subsegment As Defined By Lac 33:Ix.1123.A. Et Seq. No Other Assessment Is Made For This Waterbody. | Waterbody Map | Freshwater Lake | .0 | Acres | Impaired | TMDL needed |
| I-10 Canal | LA010501_001 | I-10 Canal - Located Within Subsegment La010501_00. This Unit Is Added For Advisory Tracking Purposes Only And Is Not A Subsegment As Defined By Lac 33:Ix.1123.A. Et Seq. No Other Assessment Is Made For This Waterbody. | Waterbody Map | River | .0 | Miles | Impaired | TMDL needed |
| Intracoastal Waterway - Bayou Boeuf Lock To Bayou Sale | LA010803_00 | Intracoastal Waterway -Bayou Boeuf Lock To Bayou Sale | Waterbody Map | River | 21.0 | Miles | Good | |
| Intracoastal Waterway (Morgan City - Port Allen Route) | LA010502_00 | Intracoastal Waterway (Morgan City-Port Allen Route)-Bayou Sorrel Lock To Morgan City | Waterbody Map | River | 85.0 | Miles | Good | |
| Lake Bigeux | LA010301_002 | Lake Bigeux - Located Within Subsegment La010301_00. This Unit Is Added For Advisory Tracking Purposes Only And Is Not A Subsegment As Defined By Lac 33:Ix.1123.A. Et Seq. No Other Assessment Is Made For This Waterbody. | Waterbody Map | Freshwater Lake | .0 | Acres | Impaired | TMDL needed |
| Lower Atchafalaya Basin Floodway | LA010501_00 | Lower Atchafalaya Basin Floodway-Whiskey Bay Pilot Channel At Mile 54 To U.S. Hwy. 90 Bridge In Morgan City (Includes Grand Lake And Six-Mile Lake) | Waterbody Map | Wetlands, Freshwater | 464,000.0 | Acres | Good | |
| Lower Atchafalaya River | LA010801_00 | Lower Atchafalaya River-U.S. Hwy. 90 Bridge In Morgan City To Atchafalaya Bay, Includes Sweetbay Lake And Bayou Shaffer | Waterbody Map | River | 19.0 | Miles | Good | |
| Wax Lake Outlet - Hwy. 90 Bridge To Atchafalaya Bay | LA010802_00 | Wax Lake Outlet-From U.S. Hwy. 90 Bridge To Atchafalaya Bay, Includes Wax Lake | Waterbody Map | River | 15.0 | Miles | Good | |
| West Atchafalaya Basin Floodway | LA010301_00 | West Atchafalaya Basin Floodway-Simmesport To Butte Larose Bay And Henderson Lake | Waterbody Map | Wetlands, Freshwater | 199,040.0 | Acres | Impaired | TMDL needed |
| Work Canal | LA010501_002 | Work Canal - Located Within Subsegment La010501_00. This Unit Is Added For Advisory Tracking Purposes Only And Is Not A Subsegment As Defined By Lac 33:Ix.1123.A. Et Seq. No Other Assessment Is Made For This Waterbody. | Waterbody Map | River | .0 | Miles | Impaired | TMDL needed |
Causes of Impairment for Reporting Year 2006
Louisiana, Atchafalaya
Description of this table| NOTE: Click on the underlined "Cause of Impairment" value to see a listing of those waters with that cause of impairment. | |||||||||||||||
| Cause of Impairment | Size of Assessed Waters with Listed Causes of Impairment | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
Bays and Estuaries (Square Miles) |
Wetlands (Acres) |
||||||||||||
| Non-Native Aquatic Plants | 14.0 | ||||||||||||||
| Sulfates | 18.0 | ||||||||||||||
| Chloride | 18.0 | ||||||||||||||
| Fecal Coliform | 18.0 | 391.0 | |||||||||||||
| Phosphorus, Total | 18.0 | ||||||||||||||
| Atrazine | 18.0 | ||||||||||||||
| Nitrate/Nitrite (Nitrite + Nitrate as N) | 18.0 | ||||||||||||||
| Dissolved Oxygen | 36.0 | 195,840.0 | |||||||||||||
| Mercury | 13.1 | .0 | 391.0 | 394,880.0 | |||||||||||
| Total Dissolved Solids (TDS) | 36.0 | ||||||||||||||
Probable Sources Contributing to Impairments for Reporting Year 2006
Louisiana, Atchafalaya Watershed
Description of this table| Probable Source | Size of Assessed Waters with Probable Sources of Impairments | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Lakes, Reservoirs, and Ponds (Acres) |
Bays and Estuaries (Square Miles) |
Wetlands (Acres) |
||||||||||||
| Atmospheric Deposition - Toxics | 13.1 | .0 | 391.0 | 394,880.0 | |||||||||||
| Introduction Of Non-Native Organisms (Accidental Or Intentional) | 14.0 | ||||||||||||||
| Irrigated Crop Production | 36.0 | ||||||||||||||
| Natural Sources | 18.0 | 391.0 | |||||||||||||
| Non-Irrigated Crop Production | 36.0 | 195,840.0 | |||||||||||||
| On-Site Treatment Systems (Septic Systems And Similar Decencentralized Systems) | 36.0 | ||||||||||||||
| Package Plant Or Other Permitted Small Flows Discharges | 391.0 | ||||||||||||||
| Petroleum/Natural Gas Production Activities (Permitted) | 391.0 | 195,840.0 | |||||||||||||
| Source Unknown | 13.1 | .0 | 391.0 | 394,880.0 | |||||||||||
TMDL Alternatives by Cause of Impairment for Reporting Year 2006
Louisiana, Atchafalaya Watershed
Description of this table
| NOTE: Click on the underlined "Number of TMDL Alternatives by Cause of Impairment " value to see a listing of those Causes of Impairment. | ||||||||||||||
| Cause of Impairment | Number of TMDL Alternatives |
Rivers and Streams (Miles) |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Non-Native Aquatic Plants |  1 |
14 | ||||||||||||
Total: 1 TMDL Alternatives
Cumulative TMDLs by Pollutant
Louisiana, Atchafalaya Watershed
This chart includes TMDLs since October 1, 1995.
Description of this table
| NOTE: Click on the underlined "Number of TMDLs Completed" value to see a listing of those approved TMDLs for the pollutant. | ||
| Pollutant | Number of TMDLs Completed | Number of Causes of Impairment Addressed |
|---|---|---|
| Dissolved Oxygen |  3 |
3 |
| Mercury | 3 |
3 |
| Nutrients Oxygen Demand | 3 |
3 |
| Oxygen Demand | 3 |
3 |
| Total Suspended Solids (TSS) | 3 |
3 |
| Fecal Coliform | 2 |
2 |
| Nitrogen | 2 |
2 |
| Total Dissolved Solids (TDS) | 2 |
2 |
| Biochemical Oxygen Demand (BOD) | 1 |
1 |
| Carbofuran | 1 |
1 |
| Chloride | 1 |
1 |
| Mercury in Fish Tissue | 1 |
1 |
| Phosphorus, Total | 1 |
1 |
| Siltation | 1 |
1 |
| Sulfate | 1 |
1 |
| Sulfates | 1 |
1 |
Total: 29 TMDLs; 0 Causes of Impairment
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