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South Coast Basin Water Quality Status/Action Plan

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South Coast Basin Water Quality Status/Action Plan South Coast Basin Watershed Approach South Coast Basin Status Report Appendices Appendix A: Section 303D and 305B Information ............................................ 5 Appendix B: South Coast Basin Land Use Detail .............................................. 17 Appendix C: Water Availability and Water Rights .......................................... 23 Appendix D: General NPDES Permits by Sub-basin ........................................ 31 Appendix E: CEMAP Sampling Site Detail ........................................................... 36 Appendix F: Biomonitoring Sampling Site Detail and Condition ............... 40 Appendix G: Water Quality Data Graphics and Detail ................................... 47 Floras Creek Dissolved Oxygen and pH TMDL Intensive ...................................................52 Floras Creek Diel Fluctuations – July 2008 ........................................................................53 Sixes River Ambient Sampling ...........................................................................................54 Sixes River Spawning Dissolved Oxygen TMDL Intensive .................................................58 Sixes River Diel Fluctuations..............................................................................................59 Elk River Ambient Sampling ...............................................................................................60 Hunter Creek Dissolved Oxygen and pH TMDL Intensive – July 2008 ...............................64 Hunter Creek Diel Fluctuations – August 2008 ...................................................................65 Pistol River Ambient Sampling ...........................................................................................67 Pistol River Dissolved Oxygen and pH TMDL Intensive – August 2008 .............................71 Pistol River Diel Fluctuations..............................................................................................72 Chetco River Ambient Sampling ........................................................................................74 Winchuck River Ambient Sampling ....................................................................................78 Winchuck River Spawning Dissolved Oxygen TMDL Intensive – September 2010 ............82 Winchuck River Diel Fluctuations – Bar Bound Condition (Pre Spawn) ..............................83 Ambient Sampling Nutrients ...............................................................................................85 South Coast Basin Ambient Sampling Bacteria ..................................................................88 Coquille River Ambient Monitoring .....................................................................................94 Coquille River Dissolved Oxygen and pH Intensive – Pending Addition ........................... 110 Coquille River Ambient Bacteria ....................................................................................... 111 Coquille River Bacterial Intensive - Pending Addition ....................................................... 116 Coos River Ambient Monitoring ........................................................................................ 116 Coos River Dissolved Oxygen and pH TMDL Intensives .................................................. 124 1 South Coast Basin Watershed Approach Coos River Diel Fluctuations - August 2006 ..................................................................... 126 Coos River Diel Fluctuations - October 2006 Spawning Period ........................................ 127 Coos Ambient Nutrient - Pending Addition ....................................................................... 128 Coos River Ambient Bacteria ........................................................................................... 129 Coos River Bacterial Intensives - Pending Addition .......................................................... 131 Isthmus Slough Dissolved Oxygen and pH Intensives ..................................................... 132 Isthmus Slough Diel Fluctuations – Fall and Summer ...................................................... 133 Appendix H: Tenmile Lakes HABs Summary ................................................. 135 Appendix I: South Coast Basin Surface and Groundwater Public Water Systems ....................................................................................................................... 139 Table of Figures and Tables……………………………………………………………………….. Table 1 - Coos Sub-basin 2010 303d Listing Requiring a TMDL ................................................ 6 Table 2 – Coos Sub-basin Insufficient Data ............................................................................... 8 Table 3 – Coquille Sub-Basin 2010 303d Listings Requiring a TMDL ........................................10 Table 4 – Coquille Sub-basin Insufficient Data ..........................................................................12 Table 5 – Sixes Sub-basin 2010 303d Listing Requiring a TMDL ..............................................13 Table 6 – Sixes Sub-basin Insufficient Data ..............................................................................14 Table 7 – Chetco Sub-basin 303d Listings Requiring a TMDL ..................................................15 Table 8 – Chetco Sub-basin Insufficient Data ...........................................................................15 Table 9 – South Coast Basin Water Quality Limited TMDL Not Needed ...................................16 Table 10 – Coquille Sub-basin Land Cover and Use .................................................................18 Table 11 – Coos Sub-basin Land Cover and Use .....................................................................19 Table 12 – Sixes Sub-basin Land Cover and Use .....................................................................20 Table 13 – Chetco Sub-basin Land Cover and Use ..................................................................21 Table 14– Smith River Sub-basin Land Cover and Use ............................................................22 Table 15 – Coos 4th Field HUC – General NPDES Permits .......................................................32 Table 16 – Coquille 4th Field HUC – NPDES Permits ................................................................33 Table 17 – Sixes 4th Field HUC – NPDES Permits ....................................................................34 Table 18 – Chetco 4th Field HUC – NPDES Permits ..................................................................34 Table 19 - CEMAP Site Detail ...................................................................................................37 Table 20 – South Coast Basin Invertebrate Sample Locations and Conditions .........................41 Table 21 – Floras Creek Dissolved Oxygen Deficit ...................................................................52 Table 22 – Sixes River Dissolved Oxygen Deficit ......................................................................58 Table 23 – Hunter Creek Dissolved Oxygen Deficit ...................................................................64 Table 24 – Pistol River Dissolved Oxygen Deficit ......................................................................71 Table 25 – Winchuck River-Dissolved Oxygen Deficit ...............................................................82 Table 26 – Coos River Dissolved Oxygen-Deficit .................................................................... 124 Table 27 – West Fork Millicoma River Dissolved Oxygen Deficit ............................................. 125 Table 28 – Isthmus Slough Dissolved Oxygen Deficit ............................................................. 132 Table 30 – Surface Water Public Water Systems (PWS) ........................................................ 140 Table 31 – Groundwater Public Water Systems (PWS) ........................................................... 141 Figure 4 – Coquille Sub-basin Land Use ...................................................................................18 Figure 5 – Coos Sub-basin Land Use .......................................................................................19 Figure 6 – Sixes Sub-basin Land Use .......................................................................................20 Figure 7 – Chetco Sub-basin Land Use ....................................................................................21 Figure 1 – Tenmile Creek Water Availability and Consumptive Water Right Uses .....................24 2 South Coast Basin Watershed Approach Figure 2 – Tributaries to Coos Bay Water Availability and Consumptive Water Rights by Use ..25 Figure 3 – Coos River Water Availability and Consumptive Water Right by Use .......................26 Figure 4 – Coquille River Water Availability and Consumptive Water Rights by Use .................27 Figure 5 – Sixes 4th Field HUC Water Availability and Consumptive Water Rights by Use ........28 Figure 6 – New River Water Availability and Consumptive Water Rights by Use .......................29 Figure 7 – Chetco 4th Field HUC Water Availability and Consumptive Water Rights by Use.....30 Figure 8 – Floras Creek Dissolved Oxygen ...............................................................................48 Figure 9 – Floras Creek pH .......................................................................................................49 Figure 10 – Floras Creek Temperature .....................................................................................50
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