Applegate Subbasin Total Maximum Daily Load (Tmdl) Huc # 17100309
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APPLEGATE SUBBASIN TOTAL MAXIMUM DAILY LOAD (TMDL) HUC # 17100309 Applegate River Mile 8 Applegate River Mile 39 Little Applegate River Near Mouth Beaver Creek Mile 3 December 2003 Prepared by Oregon Department of Environmental Quality For more information, contact: Bill Meyers Oregon Department of Environmental Quality 201 W. Main Street, #2-D Medford, OR 97501 Applegate Subbasin TMDL December 2003 Statement of Purpose This Total Daily Maximum Load (TMDL) document has been prepared to meet the requirements of Section 303(d) of the 1972 Federal Clean Water Act. Table of Contents EXECUTIVE SUMMARY .........................................................................................................................................1 WATER QUALITY SUMMARY .....................................................................................................................................1 Introduction..........................................................................................................................................................1 Scope....................................................................................................................................................................1 Legal Requirements..............................................................................................................................................1 Listed Parameters ................................................................................................................................................1 TMDL SUMMARIES...................................................................................................................................................1 TMDL Load Capacity and Allocations:...............................................................................................................1 Temperature TMDL:............................................................................................................................................2 Sedimentation: .....................................................................................................................................................3 Biological Criteria:..............................................................................................................................................4 Flow Modification: ..............................................................................................................................................4 Habitat Modification: ..........................................................................................................................................4 WATER QUALITY MANAGEMENT PLAN.....................................................................................................................4 SECTION 1. APPLEGATE SUBBASIN TMDL BACKGROUND AND INTRODUCTION.............................1 OREGON’S TMDL PROGRAM (GENERALLY DEFINED) ..............................................................................................1 DOCUMENT ORGANIZATION ......................................................................................................................................1 WATERSHED CHARACTERIZATION ............................................................................................................................2 Geographic Setting ..............................................................................................................................................2 Ownership............................................................................................................................................................3 Geology................................................................................................................................................................3 Climate and Weather ...........................................................................................................................................4 Hydrology ............................................................................................................................................................4 Applegate Dam.....................................................................................................................................................5 Fisheries...............................................................................................................................................................5 Coho Salmon (Oncorhynchus kisutch).............................................................................................................................. 6 Chinook Salmon (Oncorhynchus tshawytscha)................................................................................................................. 6 Steehhead (Oncorhynchus mykiss).................................................................................................................................... 6 Resident Trout (Oncorhynchus species)............................................................................................................................ 6 WATER QUALITY IMPAIRMENTS................................................................................................................................7 WATER QUALITY IMPAIRMENTS – CALIFORNIA LANDS..............................................................................................9 APPLICABLE WATER QUALITY STANDARDS..............................................................................................................9 Beneficial Uses: ...................................................................................................................................................9 Temperature Standard: OAR 340-041-0365(2)(b)(A)........................................................................................10 Sedimentation Standard: OAR 340-041-0365(2)(j), (OAR 340-41-027), OAR 340-41-0365(2)(c) ...................11 Biological Criteria Standard: OAR 340-41-027................................................................................................11 Flow Modification Standard: OAR 340-041-0365 (2)(I), OAR 340-41-362......................................................11 Habitat Modification Standard: OAR 340-041-0365 (2)(I), OAR 340-41-362..................................................12 SECTION 2. TEMPERATURE TMDL .................................................................................................................13 INTRODUCTION:.......................................................................................................................................................15 SUBWATERSHED DESCRIPTION AND OWNERSHIP ....................................................................................................15 BENEFICIAL USES SENSITIVE TO TEMPERATURE. ....................................................................................................15 DEVIATION FROM WATER QUALITY STANDARDS; 303(D) LISTINGS........................................................................15 SALMONID STREAM TEMPERATURE REQUIREMENTS...............................................................................................17 TEMPERATURE TARGET IDENTIFICATION: CWA 303(D) (1) ....................................................................................18 CRITICAL PERIOD - SEASONAL VARIATION – CWA §303(D)(1) ..............................................................................20 EXISTING POLLUTION SOURCES – CWA §303(D)(1) ...............................................................................................20 Point Sources:....................................................................................................................................................20 Oregon Department of Environmental Quality i Applegate Subbasin TMDL December 2003 Nonpoint Sources:..............................................................................................................................................21 1. Near-stream vegetation disturbance/removal ............................................................................................................. 21 System Potential Vegetation............................................................................................................................................ 24 2. Channel modifications and widening.......................................................................................................................... 25 3. Hydromodification-Water Withdrawals ...................................................................................................................... 26 4. Natural Sources .......................................................................................................................................................... 27 Applegate Dam...................................................................................................................................................27 Flows .............................................................................................................................................................................. 27 Temperature.................................................................................................................................................................... 28 TMDL - LOADING CAPACITIES AND ALLOCATIONS ................................................................................................30