DEQ's mission is to be a leader in restoring, maintaining and enhancing the quality of Oregon's air, land and water.

John Day Basin

TMDL title: John Day Basin TMDL and WQMP
Water quality limited parameters: ammonia toxicity, aquatic weeds or algae, E. coli, fecal coliform, nitrate, pH, sedimentation, temperature, turbidity
Pollutants: ammonia nitrogen, heat, E. coli, nitrate, total suspended solids, turbidity
Status: EPA approved on Dec. 17, 2010

Project overview

Many streams and rivers of the John Day Basin do not meet water quality standards during part or all of the year. DEQ has identified several water quality concerns in the

basin, including high temperature and bacteria levels, low oxygen concentrations and impaired biological conditions.

Final TMDL documents

Addendum – Clarifications to John Day River Basin TMDL
TMDL Order Memo
Fact Sheet: Pollution Limits and Water Quality Plan for the John Day Basin
John Day River Basin TMDL and WQMP
Appendix A: Temperature Model Calibration Report
Appendix B: Temperature Model Scenario Report
Appendix C: Estimate of Natural Potential Vegetation in the John Day Basin
Appendix D: Dissolved Oxygen Assessment
Appendix E: Bacteria Assessment
Appendix F: Biological Criterion Assessment
Appendix G: Description of Selected Terms
Appendix H: Selected Abbreviations
Response to Public Comment

Contact

Trea Nance
Basin Coordinator
971-263-0841

Basin Coordinator List

Steve Mrazik
Watershed Management Manager
503-229-5379

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