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Middle Willamette Agricultural Water Quality Management Area Plan

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Middle Willamette Agricultural Water Quality Management Area Plan Middle Willamette Agricultural Water Quality Management Area Plan October 2020 Developed by the Oregon Department of Agriculture and the Middle Willamette Local Advisory Committee with support from the Benton and Polk Soil and Water Conservation Districts Oregon Dept. of Agriculture Benton SWCD Polk SWCD Water Quality Program 456 SW Monroe Avenue 580 Main Street 635 Capitol St. NE Corvallis, OR 97333 Dallas, OR 97338 Salem, OR 97301 (541) 753-7208 (503) 623-9680 (503) 986-4700 www.bentonswcd.org www.polkswcd.com Website: oda.direct/AgWQPlans (This page is blank) Table of Contents Acronyms and Terms .............................................................................................................. iii Foreword ................................................................................................................................... 5 Required Elements of Area Plans............................................................................................ 5 Plan Content ............................................................................................................................. 5 Chapter 1: Agricultural Water Quality Program ................................................................. 7 1.1 Purpose of Agricultural Water Quality Program and Applicability of Area Plans. 7 1.2 History of the Ag Water Quality Program ................................................................ 7 1.3 Roles and Responsibilities ....................................................................................... 8 1.3.1 Oregon Department of Agriculture ..................................................................................... 8 1.3.2 Local Management Agency .............................................................................................. 11 1.3.3 Local Advisory Committee ............................................................................................... 11 1.3.4 Agricultural Landowners .................................................................................................. 11 1.3.5 Public Participation .......................................................................................................... 12 1.4 Agricultural Water Quality ...................................................................................... 12 1.4.1 Point and Nonpoint Sources of Water Pollution ................................................................ 12 1.4.2 Beneficial Uses and Parameters of Concern ..................................................................... 13 1.4.3 Impaired Waterbodies and Total Maximum Daily Loads .................................................... 13 1.4.4 Oregon Water Pollution Control Law – ORS 468B.025 and 468B.050 .............................. 14 1.4.5 Streamside Vegetation and Agricultural Water Quality ..................................................... 15 1.4.6 Soil Health and Agricultural Water Quality........................................................................ 16 1.5 Other Water Quality Programs ............................................................................... 16 1.5.1 Confined Animal Feeding Operation Program ................................................................... 16 1.5.2 Groundwater Management Areas ..................................................................................... 17 1.5.3 The Oregon Plan for Salmon and Watersheds ................................................................... 17 1.5.4 Pesticide Management and Stewardship .......................................................................... 17 1.5.5 Drinking Water Source Protection .................................................................................... 18 1.6 Partner Agencies and Organizations ..................................................................... 18 1.6.1 Oregon Department of Environmental Quality .................................................................. 18 1.6.2 Other Partners ................................................................................................................. 19 1.7 Measuring Progress ................................................................................................ 19 1.7.1 Measurable Objectives ..................................................................................................... 19 1.7.2 Land Conditions and Water Quality ................................................................................... 20 1.7.3 Focused Implementation in Small Geographic Areas ........................................................ 20 1.8 Progress and Adaptive Management ..................................................................... 21 1.8.1 Biennial Reviews .............................................................................................................. 21 1.8.2 Water Quality Monitoring ................................................................................................. 22 Chapter 2: Local Background ........................................................................................... 23 2.1 Local Roles .............................................................................................................. 24 Middle Willamette Agricultural Water Quality Management Area Plan October 2020 Page i 2.1.1 Local Advisory Committee ............................................................................................... 24 2.1.2 Local Management Agency .............................................................................................. 24 2.2 Area Plan and Area Rules: Development and History .......................................... 25 2.3 Geographical and Physical Setting ........................................................................ 25 2.4 Agricultural Water Quality ...................................................................................... 31 2.4.1 Water Quality Issues ......................................................................................................... 31 2.4.1.2 WQ Parameters and 303(d) list .................................................................................... 33 2.4.1.3 TMDLs and Agricultural Load Allocations ..................................................................... 33 2.4.1.4 Drinking Water ............................................................................................................. 34 2.4.1.5 GWMA .......................................................................................................................... 36 2.4.2 Sources of Impairment ..................................................................................................... 37 2.5 Regulatory and Voluntary Measures ..................................................................... 37 2.5.1 Nutrients and Manure Management.................................................................................. 38 2.5.2 Streamside Area Management ......................................................................................... 40 2.5.3 Soil Erosion Prevention and Control ................................................................................. 42 2.5.4 Preferred Management Practices ..................................................................................... 43 Chapter 3: Implementation Strategies .............................................................................. 51 3.1 Measurable Objectives and Strategic Initiatives ................................................... 51 3.1.1 Management Area ............................................................................................................ 51 3.1.2 Focus Areas ..................................................................................................................... 51 3.1.3 Strategic Implementation Area(s) .................................................................................... 53 3.2 Proposed Activities ................................................................................................. 54 3.3 Water Quality and Land Condition Monitoring ...................................................... 55 3.3.1 Water Quality ................................................................................................................... 55 3.3.2 Land Conditions: DEQ Assessment of Stream Shading ...................................................... 55 Chapter 4: Progress and Adaptive Management ............................................................. 59 4.1 Measurable Objectives and Strategic Initiatives ................................................... 59 4.1.1 Management Area ............................................................................................................ 59 4.1.2 Focus Areas in Small Watersheds ..................................................................................... 59 4.1.3 Strategic Implementation Area(s) .................................................................................... 60 4.2 Activities and Accomplishments ........................................................................... 60 4.3 Water Quality and Land Condition Monitoring ...................................................... 62 4.3.1 Water Quality ................................................................................................................... 62 4.3.2 Land Conditions: DEQ Assessment of Stream Shading ...................................................... 64 4.4 Biennial Reviews and Adaptive Management ......................................................
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