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Lochsa River Subbasin Temperature Total Maximum Daily Loads: Addendum to the Lochsa River Subbasin Assessment

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Lochsa River Subbasin Temperature Total Maximum Daily Loads: Addendum to the Lochsa River Subbasin Assessment Lochsa River Subbasin Temperature Total Maximum Daily Loads: Addendum to the Lochsa River Subbasin Assessment State of Idaho Department of Environmental Quality April 2012 Revised October 2012 Lochsa River Subbasin Temperature Total Maximum Daily Loads April 2012 Revised October 2012 Lewiston Regional Office Department of Environmental Quality Prepared by: State Technical Services Office Department of Environmental Quality 1410 N. Hilton Boise, ID 83706 This page intentionally left blank for correct double-sided printing. Lochsa River Subbasin Temperature TMDLs April 2012 Revised October 2012 Acknowledgments The Idaho Department of Environmental Quality extends our sincere gratitude to the Clearwater Basin Advisory Group. They have endured years of discussion while water temperature concerns in the Lochsa River watershed were considered. We also would like to acknowledge Mr. Mark Shumar of DEQ’s Technical Services Office for all his work in the completion of this document. The result is a water quality improvement plan that allows for a focused and achievable cooperative implementation approach to meeting the goals and requirements of the Idaho State Water Quality Standards and the Federal Clean Water Act. iii Lochsa River Subbasin Temperature TMDLs April 2012 Revised October 2012 This page intentionally left blank for correct double-sided printing. iv Lochsa River Subbasin Temperature TMDLs April 2012 Revised October 2012 Table of Contents Acknowledgments ...................................................................................................................... iii Abbreviations, Acronyms, and Symbols ..................................................................................... ix Executive Summary ................................................................................................................... xi Subbasin at a Glance .......................................................................................................... xi Key Findings ..................................................................................................................... xiv Introduction ................................................................................................................................. 1 1. Subbasin Assessment—Watershed Characterization ............................................................. 1 2. Water Quality Concerns and Status ........................................................................................ 1 2.1 Beneficial Uses ..............................................................................................................2 Existing Uses ................................................................................................................2 Designated Uses ...........................................................................................................3 Presumed Uses.............................................................................................................3 2.2 Criteria to Support Beneficial Uses .................................................................................3 3. Pollutant Source Inventory ...................................................................................................... 6 4. Past and Present Pollution Control Efforts and Implementation............................................... 7 5. Total Maximum Daily Loads .................................................................................................... 8 5.1 Instream Water Quality Targets ......................................................................................9 Potential Natural Vegetation for Temperature TMDLs ...................................................9 Aerial Photo Interpretation ...........................................................................................11 Pathfinder Methodology ..............................................................................................11 Stream Morphology .....................................................................................................12 Design Conditions .......................................................................................................14 Target Selection ..........................................................................................................14 Monitoring Points ........................................................................................................15 5.2 Load Capacity ..............................................................................................................16 5.3 Estimates of Existing Pollutant Loads ...........................................................................17 5.4 Load Allocation.............................................................................................................18 Wasteload Allocation ...................................................................................................21 Margin of Safety ..........................................................................................................21 Seasonal Variation ......................................................................................................21 Construction Stormwater and TMDL Wasteload Allocations ........................................21 Construction Stormwater...........................................................................................21 The Construction General Permit ..............................................................................21 Stormwater Pollution Prevention Plan .......................................................................22 Construction Stormwater Requirements ....................................................................22 5.5 Implementation Strategies ............................................................................................22 Time Frame .................................................................................................................22 Approach.....................................................................................................................22 Designated Management Agencies and Responsible Parties......................................23 Monitoring Strategy .....................................................................................................23 5.6 Public Participation .......................................................................................................23 5.7 Conclusions .................................................................................................................23 References Cited ...................................................................................................................... 25 Glossary.................................................................................................................................... 27 v Lochsa River Subbasin Temperature TMDLs April 2012 Revised October 2012 List of Tables Table A. Tributary watersheds for which temperature TMDLs were developed. ........................ xii Table B. Summary of assessment outcomes for §303(d)-listed streams. .................................. xv Table 1. 2010 Integrated Report §303(d)-listed streams (Category 5). ........................................ 2 Table 2. Solar Pathfinder results from ten sites in the Lochsa River subbasin. .......................... 16 Table 3. Total solar loads, excess load, and average lack of shade for all waters. .................... 19 Table 4. Summary of assessment outcomes. ............................................................................ 24 Table C-1. Metric–English unit conversions. ............................................................................. 71 Table D-1. Data sources for 37 assessment units with TMDLs. ................................................ 75 Table D-2. Bankfull width estimates (in meters) for streams in the Lochsa River subbasin TMDL based on drainage area (in square miles) and existing measurements. .............. 76 Table E-1. Existing and potential solar loads for lower Lochsa River tributaries (AU# ID17060303CL001_02). ....................................................................................... 93 Table E-2. Existing and potential solar loads for Cold Storage Creek and others (AU# 17060303CL020_02a). ......................................................................................... 94 Table E-3. Existing and potential solar loads for Cliff Creek and tributary (AU# 17060303CL022_02). ........................................................................................... 94 Table E-4. Existing and potential solar loads for Walton Creek and tributaries (AU# 17060303CL023_02). ........................................................................................... 95 Table E-5. Existing and potential solar loads for Colt Killed Creek tributaries (AU# 17060303CL024_02). ........................................................................................... 96 Table E-6. Existing and potential solar loads for Colt Killed Creek (AU# 17060303CL024_04). 96 Table E-7. Existing and potential solar loads for Beaver Creek and tributaries (AU# 17060303CL033_02). ........................................................................................... 97 Table E-8. Existing and potential solar loads for Crooked Fork Creek tributaries (AU# 17060303CL034_02). ........................................................................................... 98 Table E-9.
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