Natural Resources and Hazards Volume II: Detailed Watershed Characteristics and Regulatory Framework Analysis Prepared by DYETT & BHATIA Urban and Regional Planners Natural Resources and Hazards Volume II: Detailed Watershed Characteristics and Regulatory Framework Analysis Prepared by DYETT & BHATIA Urban and Regional Planners Table of Contents Introduction........................................................................................................................................1 1 South Fork of the Eel River Watershed.............................................................................................3 1.1 General Description of Watershed............................................................................................3 1.2 TMDL Targets and Recommendations.....................................................................................9 2 Lower Eel River Watershed ..............................................................................................................13 2.1 General Description of the Watershed....................................................................................13 2.2 Water Quality Concerns ..........................................................................................................20 3 Middle Fork Eel River Watershed....................................................................................................25 3.1 General Description of the Watershed....................................................................................25 3.2 Water Quality ...........................................................................................................................29 4 Lower Klamath Watershed...............................................................................................................35 4.1 General Description of the Watershed....................................................................................35 4.2 Water Quality Concerns ..........................................................................................................39 5 South Fork Trinity River Watershed...............................................................................................45 5.1 General Description of the Watershed....................................................................................45 5.2 TMDL Targets and Recommendations...................................................................................51 5.3 Conclusions ..............................................................................................................................54 5.4 Development of Implementation Plan....................................................................................55 5.5 President’s Northwest Forest Plan...........................................................................................55 5.6 Other Ongoing Implementation Efforts .................................................................................56 6 Lower and Main Trinity Watershed ................................................................................................59 6.1 General Description of the Watershed....................................................................................59 6.2 Water Quality Concerns ..........................................................................................................65 6.3 Known Point Sources of Pollution..........................................................................................67 7 Van Duzen River Planning Watershed ...........................................................................................71 7.1 General Description of the Watershed....................................................................................71 7.2 Water Quality Concerns ..........................................................................................................77 7.3 TMDL Targets and Recommendations...................................................................................78 8 Redwood Creek Watershed..............................................................................................................81 8.1 General Description Of The Watershed..................................................................................81 8.2 Water Quality Concerns ..........................................................................................................88 8.3 NCWAP Recommendations and Requirements ....................................................................90 8.4 TMDL Targets ..........................................................................................................................90 9 Cape Mendocino Planning Watershed............................................................................................95 9.1 General Description of Watershed..........................................................................................95 10 Trinidad Watershed........................................................................................................................115 10.1 General Description ...............................................................................................................115 10.2 Summary of Water Quality Concerns...................................................................................117 11 Mad River Watershed.....................................................................................................................120 11.1 General Description ...............................................................................................................120 11.2 Summary of Water Quality Concerns...................................................................................124 11.3 Implications for Local Government Planning:.....................................................................125 12 Eureka Plain (Humboldt Bay) Watershed ....................................................................................128 12.1 General Description ...............................................................................................................128 12.2 Implications for Local Government Planning:.....................................................................134 13 Regulatory Framework ...................................................................................................................137 13.1 Federal Regulations ................................................................................................................137 13.2 State Agencies and Regulations .............................................................................................138 13.3 California’s Management Measures for Polluted Runoff (CAMMPR)...............................142 13.4 Local Government..................................................................................................................145 14 Review of Watershed Management Studies in Humboldt County.............................................149 14.1 Regional Water Quality Control Board ................................................................................149 14.2 Clean Water Act Section 303(d) (TMDLs)...........................................................................151 14.3 State Water Resources Control Board Watershed Management Areas...............................152 14.4 Mattole River Watershed .......................................................................................................154 14.5 Humboldt Bay Watershed Management Area......................................................................157 14.6 Eel River Watershed Management Area ...............................................................................160 14.7 Trinity River Watershed Management Area.........................................................................163 Figures List Figure 1-1 South Fork Eel Planning Watershed.......................................................................................11 Figure 2-1: Lower Eel Planning Watershed..............................................................................................23 Figure 3-1: Middle Main Eel Planning Watershed ..................................................................................33 Figure 4-1: Lower Klamath Planning Watershed.....................................................................................43 Figure 5-1: South Fork Trinity Planning Watershed...............................................................................57 Figure 6-1: Lower Trinity Planning Watershed .......................................................................................69 Figure 7-1: Van Duzen Planning Watershed............................................................................................79 Figure 8-1: Redwood Creek Planning Watershed....................................................................................93 Figure 9-1: Cape Mendocino Planning Watershed................................................................................113 Figure 10-1: Trinidad Planning Watershed............................................................................................118 Figure 11-1: Mad River Planning Watershed.........................................................................................126 Figure 12-1: Eureka Plain Planning Watershed .....................................................................................135 Figure 14-1: Management Areas for the Integrated Watershed............................................................153