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Big Wood River Tributaries Temperature Total Maximum Daily Loads

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Big Wood River Tributaries Temperature Total Maximum Daily Loads Big Wood River Tributaries Temperature Total Maximum Daily Loads Addendum to the Big Wood River Watershed Management Plan HUC 17040219 State of Idaho Department of Environmental Quality October 2013 Printed on recycled paper, DEQ, October 2013, PID TM40, CA code 52130. Costs associated with this publication are available from the State of Idaho Department of Environmental Quality in accordance with Section 60-202, Idaho Code. Big Wood River Tributaries Temperature Total Maximum Daily Loads 2013 Addendum October 2013 Prepared by Idaho Department of Environmental Quality Technical Services Division 1410 N. Hilton Boise, ID 83706 Acknowledgments Cover photo of Rock Creek courtesy of Mark Shumar (Idaho Department of Environmental Quality) taken October 3, 2011. Big Wood River Tributaries Temperature TMDLs Table of Contents Abbreviations, Acronyms, and Symbols ...................................................................................... vii Executive Summary ....................................................................................................................... ix Subbasin at a Glance .................................................................................................................. ix Key Findings .............................................................................................................................. xi Public Participation .................................................................................................................. xiii Introduction ..................................................................................................................................... 1 1. Subbasin Assessment—Watershed Characterization .............................................................. 1 1.1 Introduction—Regulatory Requirements ......................................................................... 1 1.2 Public Participation and Comment Opportunities ............................................................ 2 1.3 Physical and Biological Characteristics ........................................................................... 3 1.4 Cultural Characteristics .................................................................................................... 3 2. Subbasin Assessment—Water Quality Concerns and Status .................................................. 4 2.1 Water Quality Limited Assessment Units Occurring in the Subbasin ............................. 4 2.1.1 Additional Waters Listed Since SBA/TMDL Approval ........................................... 4 2.2 Applicable Water Quality Standards and Beneficial Uses ............................................... 5 2.2.1 Existing Uses ............................................................................................................ 5 2.2.2 Designated Uses ........................................................................................................ 6 2.2.3 Presumed Uses .......................................................................................................... 6 2.3 Criteria to Support Beneficial Uses .................................................................................. 6 2.4 Summary and Analysis of Existing Water Quality Data ................................................ 11 2.4.1 Flow Characteristics................................................................................................ 11 2.4.2 Water Column Data ................................................................................................ 14 2.4.3 Biological and Other Data ...................................................................................... 15 2.4.4 Black Canyon Assessment Units ............................................................................ 16 3. Subbasin Assessment–Pollutant Source Inventory ................................................................ 22 4. Monitoring and Status of Water Quality Improvements ....................................................... 23 5. Total Maximum Daily Loads ................................................................................................. 23 5.1 Instream Water Quality Targets ..................................................................................... 25 5.1.1 Factors Controlling Water Temperature in Streams ............................................... 25 5.1.2 Potential Natural Vegetation for Temperature Total Maximum Daily Loads ........ 26 5.1.3 Solar Pathfinder Field Verification ......................................................................... 27 5.1.4 Natural Bank-Full Widths ....................................................................................... 28 5.1.5 Design Conditions ................................................................................................... 30 5.1.6 Shade Curve Selection ............................................................................................ 30 5.2 Load Capacity ................................................................................................................. 31 iii October 2013 Big Wood River Tributaries Temperature TMDLs 5.3 Estimates of Existing Pollutant Loads ............................................................................ 31 5.4 Load Allocation .............................................................................................................. 41 5.4.1 Water Diversion ...................................................................................................... 42 5.4.2 Wasteload Allocation .............................................................................................. 43 5.4.3 Margin of Safety ..................................................................................................... 45 5.4.4 Seasonal Variation .................................................................................................. 45 5.5 Implementation Strategies .............................................................................................. 45 5.5.1 Time Frame ............................................................................................................. 46 5.5.2 Approach ................................................................................................................. 46 5.5.3 Responsible Parties ................................................................................................. 46 5.5.4 Monitoring Strategy ................................................................................................ 47 5.6 Public Participation ........................................................................................................ 47 5.7 Conclusions .................................................................................................................... 47 References ..................................................................................................................................... 49 Geographic Information System Coverages ............................................................................. 50 Glossary ........................................................................................................................................ 51 Appendix A. Data Sources and Other Data .................................................................................. 61 Appendix B. State and Site-Specific Water Quality Standards and Criteria ................................ 67 Appendix C. Unit Conversion Chart ............................................................................................. 69 Appendix D. Point Source NPDES Facilities by Industry ............................................................ 71 Appendix E. Public Comments ..................................................................................................... 73 Appendix F. Distribution List ....................................................................................................... 75 List of Tables Table A. Streams and pollutants for which total maximum daily loads were developed. ............ xii Table B. Summary of assessment outcomes. ................................................................................ xii Table 1. Section 303(d) segments in the Big Wood River subbasin. ............................................. 4 Table 2. Beneficial uses of §303(d) listed streams. ........................................................................ 6 Table 3. Selected numeric criteria supportive of designated beneficial uses in Idaho water quality standards. ............................................................................................................................ 8 Table 4 . Black Canyon Creek and tributaries flow measurements in cubic feet per second. ...... 12 Table 5. Quigley Creek water quality data for 2007–2008 sampling (n=4). ................................ 14 Table 6. Rock Creek water quality data for 2007–2009 sampling (n=4). .................................... 15 Table 7. Bank-full width estimates based on drainage area. ......................................................... 29 Table 8. Existing and target solar loads for Quigley Creek. ......................................................... 33 Table 9. Existing and target solar loads for Rock Creek. ............................................................. 34 Table 10. Total solar loads and average lack of shade for all waters. .......................................... 41 Table 11. Summary of assessment outcomes. .............................................................................
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