The Willamette Basin

Columbia Slough Watershed Molalla-Pudding Subbasin Tualatin Subbasin Willamette Basin Yamhill Subbasin

Willamette Basin

• Willamette Basin TMDLs Home Page

  TMDL approved by the U.S. Environmental Protection Agency (EPA) on September 29, 2006

• TMDL Order Memorandum - September 21, 2006 PDF
   
• Executive Summary PDF
• Acknowledgements PDF
• Glossary of Acronyms and Terms PDF
• Chapter 1: Overview PDF 2.1mb
• Chapter 2: Willamette Basin Bacteria TMDL PDF
• Chapter 3: Willamette Basin Mercury TMDL PDF 1.5mb
• Chapter 4: Temperature-Mainstem TMDL and Subbasin Summary PDF 6.3mb
• Chapter 5: Lower Willamette Subbasin TMDL PDF 9.6mb
• Chapter 6: Clackamas Subbasin TMDL PDF 3.5mb
• Chapter 7: Middle Willamette Subbasin TMDL PDF 6.7mb
• Chapter 8: North Santiam Subbasin TMDL PDF 3.5mb
• Chapter 9: South Santiam Subbasin TMDL PDF 4.8mb
• Chapter 10: Upper Willamette Subbasin TMDL PDF 15.2mb
• Chapter 11: McKenzie Subbasin TMDL PDF 3.3mb
• Chapter 12: Middle Fork Willamette Subbasin TMDL PDF 3.8mb
• Chapter 13: Coast Fork Willamette Subbasin TMDL PDF 6.0mb
• Chapter 14: Water Quality Management Plan (WQMP) PDF
• Appendix A: Bacteria PDF 1.8mb
• Appendix B: Mercury PDF 2.8mb
• Appendix C: Temperature PDF 11.0mb
   
• Response to Public Comments PDF 8.0mb

Columbia Slough Watershed

  TMDL approved by the U.S. Environmental Protection Agency (EPA) on November 25, 1998

• Columbia Slough Watershed Map PDF 1.3mb
  
• Total Maximum Daily Loads (TMDLs) PDF 1.0mb

Molalla-Pudding Subbasin

TMDL approved by the U.S. Environmental Protection Agency on December 31, 2008.

• TMDL Order Memo PDF

• Executive Summary PDF
• Chapter 1: Overview PDF
• Chapter 2: Temperature PDF
• Chapter 3: Bacteria PDF
• Chapter 4: Pesticides PDF
• Chapter 5: Nitrate PDF
• Chapter 6: Metals PDF
• Chapter 7: Water Quality Management Plan (WQMP) PDF
• Appendix A: Temperature Analysis PDF
• Appendix B: Willamette Near Stream Land Cover PDF
• Appendix C: Heat Source Model PDF
• Appendix D: Example Effluent Temperatures PDF
• Appendix E: Natural Thermal Potential Estimation PDF
• Appendix F: Bacteria Analytical Methods PDF
• Appendix G: Bacteria Data Review PDF
• Appendix H: Bacteria Statistical Test PDF
• Appendix I: Current Pesticides PDF
• Appendix J: Pesticide Analysis PDF
• Appendix K: TSS Turbidity Model PDF
• Appendix L: Nitrate Analysis PDF
• Appendix M: Metals Analysis PDF

• Response to Public Comment PDF

Tualatin Subbasin

•  Tualatin Subbasin TMDLs Home Page (Under construction)

TMDL approved by the U.S. Environmental Protection Agency (EPA) on August 7, 2001

• Total Maximum Daily Load (TMDL) and Water Quality Management Plan (WQMP) PDF 3.5mb
• Appendix A: Temperature Technical Analysis PDF 16.5mb
• Appendix B: Bacteria Model Description PDF
• Appendix C: Supporting Documents for the Chlorophyll A/pH (Phosphorus) TMDL PDF
• Appendix D: Supporting Documents for the Dissolved Oxygen TMDL PDF
• Appendix E: Low pH Discussion PDF 1.2mb
• Appendix F: Tualatin Subbasin Fish Habitat and Fish Community Information PDF 1.7mb
• Appendix G: Toxics Discussion PDF
• Appendix H: Biological Criteria Discussion PDF
• Appendix I: Tualatin Subbasin Water Quality Management Plan (WQMP) PDF
   
• Response to Public Comment PDF 1.1mb

Yamhill Subbasin

  TMDL Report In-Progress (Data analysis and report writing phase)

• DEQ Memo Regarding Yamhill Subbasin TMDL Review Committee, July 2009 PDF

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