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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, Lake Maurepas Watershed
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Assessment Summary for Reporting Year 2006
Louisiana, Lake Maurepas 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 |
|---|---|---|---|---|---|---|---|---|
| Amite River Diversion Canal | LA040402_00 | Amite River Diversion Canal | Waterbody Map | River | 10.0 | Miles | Impaired | TMDL needed |
| Blind River - Amite River Diversion Canal To Lake Maurepas | LA040401_00 | Blind River-Amite River Diversion Canal To Mouth At Lake Maurepas (Scenic) | Waterbody Map | River | 5.0 | Miles | Impaired | TMDL needed |
| Blind River - Source To Amite River Diversion Canal | LA040403_00 | Blind River-Source To Confluence With Amite River Diversion Canal (Scenic) | Waterbody Map | River | 20.0 | Miles | Impaired | TMDL needed |
| Lake Maurepas | LA040602_00 | Lake Maurepas | Waterbody Map | Estuary | 91.0 | Square Miles | Impaired | TMDL needed |
| New River - Headwaters To New River Canal | LA040404_00 | New River-Headwaters To New River Canal | Waterbody Map | River | 24.0 | Miles | Impaired | TMDL needed |
| Pass Manchac - Lake Maurepas To Lake Pontchartrain | LA040601_00 | Pass Manchac-Lake Maurepas To Lake Pontchartrain | Waterbody Map | River | 7.0 | Miles | Good | |
| Selsers Creek - Origin To South Slough | LA040603_00 | Selsers Creek-Origin To South Slough | Waterbody Map | River | 12.0 | Miles | Impaired | TMDL needed |
| South Slough - Includes Anderson Canal To I-55 Borrow Pit | LA040604_00 | South Slough-Includes Anderson Canal To I-55 Borrow Pit | Waterbody Map | River | 7.0 | Miles | Not_Assessed | |
Causes of Impairment for Reporting Year 2006
Louisiana, Lake Maurepas
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) |
Bays and Estuaries (Square Miles) |
||||||||||||||
| Non-Native Aquatic Plants | 49.0 | 91.0 | |||||||||||||
| Turbidity | 25.0 | ||||||||||||||
| Chloride | 10.0 | ||||||||||||||
| Fecal Coliform | 36.0 | 91.0 | |||||||||||||
| Phosphorus, Total | 37.0 | ||||||||||||||
| Nitrate/Nitrite (Nitrite + Nitrate as N) | 37.0 | ||||||||||||||
| Ammonia, Total | 12.0 | ||||||||||||||
| Dissolved Oxygen | 61.0 | ||||||||||||||
| Mercury | 35.0 | ||||||||||||||
| Sedimentation/Siltation | 25.0 | ||||||||||||||
Probable Sources Contributing to Impairments for Reporting Year 2006
Louisiana, Lake Maurepas Watershed
Description of this table| Probable Source | Size of Assessed Waters with Probable Sources of Impairments | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rivers and Streams (Miles) |
Bays and Estuaries (Square Miles) |
||||||||||||||
| Atmospheric Deposition - Toxics | 35.0 | ||||||||||||||
| Drainage/Filling/Loss Of Wetlands | 5.0 | ||||||||||||||
| Drought-Related Impacts | 10.0 | ||||||||||||||
| Flow Alterations From Water Diversions | 20.0 | ||||||||||||||
| Introduction Of Non-Native Organisms (Accidental Or Intentional) | 49.0 | 91.0 | |||||||||||||
| On-Site Treatment Systems (Septic Systems And Similar Decencentralized Systems) | 24.0 | ||||||||||||||
| Site Clearance (Land Development Or Redevelopment) | 30.0 | ||||||||||||||
| Source Unknown | 47.0 | 91.0 | |||||||||||||
TMDL Alternatives by Cause of Impairment for Reporting Year 2006
Louisiana, Lake Maurepas 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) |
Bays and Estuaries (Square Miles) |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Non-Native Aquatic Plants |  4 |
49 | 91 | |||||||||||
Total: 4 TMDL Alternatives
Cumulative TMDLs by Pollutant
Louisiana, Lake Maurepas 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 |
|---|---|---|
| Mercury |  2 |
2 |
| Biochemical Oxygen Demand (BOD) | 1 |
1 |
| Fecal Coliform | 1 |
1 |
| Total Suspended Solids (TSS) | 1 |
1 |
Total: 5 TMDLs; 0 Causes of Impairment
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