Isanti County Local Water Management Plan July 11, 2018-July 1, 2027 Prepared by Isanti County Zoning Office with assistance from Isanti Soil and Water Conservation District 1/24/2018 ISANTI COUNTY LOCAL WATER MANAGEMENT PLAN DRAFT 2018-2028 Table of Contents I. List of Figures and Tables 3 II. Acronyms List 4 III. Acknowledgements 5 IV. Executive Summary 6 V. Implementation Plan Summary 7 1.Ground Water Objectives 7 2.Surface Water Objectives 7 3.Land Use Management Objectives 7 4.AIS Prevention and Management Objectives 7 VI. County Geography 8 VII. Population Growth and Development Pressure 9 VIII. Land Use 10 IX. Sensitive Areas and Wetlands 12 X. Drainage Ditches and Buffers 17 XI. Watershed Background 21 XII. Assessment of Priority Concerns 23 1.Protect Groundwater resource quality and quantity 23 2.Restore and protect surface water quality and quantity 30 3.Land Use Management 36 4.Aquatic Invasive Species 39 XIII. Implementation Schedule 43 XIV. Addressing Ecological Resilience within Isanti County 62 XV. Reference List 63 XVI. Appendix List 65 Appendix 1-MN Ground Water Provinces 66 Appendix 2-MN Natural and Rare Species Map 69 Appendix 3 NRCS/FSA/ISWCD Conservation Easement Definitions 71 1 ISANTI COUNTY LOCAL WATER MANAGEMENT PLAN DRAFT 2018-2028 Appendix 4 Wetland Protection Act and Public Water Descriptions 72 Appendix 5 Circular 39 Wetland Definitions 73 Appendix 6 & 7 MNDNR Public Waters and Public Waters Inventory 75 Appendix 8 NRCS's Cropland Conservation Practices for Protection of Groundwater 79 Appendix 9 Cambridge, Isanti, and Braham Wellhead Protection Maps 83 Appendix 10 Completed Stormwater Retrofit Assessments 87 A) Blue Lake SRA Summary 88 B) Cambridge SRA Summary 92 C) Isanti SRA Summary 95 D) Skogman-Fannie Lake Chain SRA Summary 98 E) Green Lake SRA Summary 102 Appendix 11 Rum River WRAPS Summary 106 Appendix 12 Lower St. Croix River WRAPS Executive Summary 110 Appendix 13-ISWCD Adoption of Resolution to Support Other Watercourses 111 Appendix 14-Priority Concerns Scoping Document 112 Appendix 15-Resolution to Adopt and Implement Local Water Management Plan 113 2 ISANTI COUNTY LOCAL WATER MANAGEMENT PLAN DRAFT 2018-2028 I. List of Figures and Tables Figure 1….Isanti County Geographic Location ..................................................................................... 8 Figure 2….Isanti County current population and population projections (Source: US Census Bureau and MN Demographic Center) ................................................................ 9 Table 1…..Isanti County population projections (source: MN Demographic Center) ............................ 9 Table 2…..Isanti County rural single family dwelling* and construction permits.................................. 10 Figure 3….Isanti County land use types (Source: 2013 National Land Cover Database). .................. 11 Table 3…..Isanti County land use types and acres (Source: National Land Cover Database 2013). 12 Figure 4….Isanti County Zoning District Map...................................................................................... 13 Figure 5….National Wetland Inventory for Isanti County .................................................................... 15 Figure 6….Isanti County Buffer Map. .................................................................................................. 19 Figure 7….Isanti County Public Drainage Ditches .............................................................................. 20 Figure 8….Watersheds within Isanti County ....................................................................................... 21 Figure 9….MN DNR-State Agency Roles in Groundwater. ................................................................. 24 Figure 10...Anoka Sand Plain Key Habitats Map ................................................................................ 26 Figure 11...Geology of Mt. Simon Aquifer-MNDNR ............................................................................. 27 Figure 12…Isanti County Surficial Geology Sensitivity Map, MNDNR. ............................................... 28 Table 4……MN Hydrogeology Atlas Series Report, surficial geology sensitivity ratings and descriptions ......................................................................................................................................... 28 Figure 13…Mt. Simon Aquifer Map of Isanti County and East Central MN-DNR. ............................... 29 Figure 14…Isanti County Impaired Waters Map ................................................................................. 32 Table 5……MPCA 2016-2018 Impaired Waters List with stressors .................................................... 34 Table 6……AIS Infested Waters List .................................................................................................. 40 Figure 15…Isanti County AIS Infested Waters map ............................................................................ 41 3 ISANTI COUNTY LOCAL WATER MANAGEMENT PLAN DRAFT 2018-2028 II. Acronyms List AIS = Aquatic Invasive Species BMP = Best Management Practices BWSR = Board of Soil and Water Resources CCRP = Continuous Conservation Reserve Program CRP = Conservation Reserve Program CREP = Conservation Reserve and Enhancement Program CSP = Conservation Security Program CWA = Clean Water Act CWF = Clean Water Fund ICCOLA = Isanti County Coalition of Lake Associations DNR = Minnesota Department of Natural Resources DWSMA = Drinking water supply management area EQIP = Environmental Quality Incentives Program FORR = Friends of the Rum River FSA = Farm Service Agency ICEC = Isanti County Environmental Coalition LID = Lake Improvement District MASWCD = Minnesota Association of Soil and Water Conservation Districts MCD = Metro Conservation Districts MDA = Minnesota Department of Agriculture MDH = Minnesota Department of Health MLT = Minnesota Land Trust MPCA = Minnesota Pollution Control Agency NPDES = National Pollutant Discharge Elimination System NRCS = Natural Resources Conservation Service RIM = Reinvest in Minnesota ISWCD = Isanti Soil and Water Conservation District SRA = Storm Water Retrofit Assessment SSTS = Subsurface Sewage Treatment Systems TEP = Technical Evaluation Panel TMDL = Total Maximum Daily Load TNC = The Nature Conservancy USACE = US Army Corps of Engineers USDA = United States Department of Agriculture USFWS = US Fish and Wildlife Service WCA = Wetland Conservation Act WHIP = Wildlife Habitat Incentive Program WPTF = Water Plan Task Force WRAPS = Watershed Restoration and Protection Strategies 1W1P = One Watershed One Plan 4 ISANTI COUNTY LOCAL WATER MANAGEMENT PLAN DRAFT 2018-2028 III. Acknowledgements This plan was prepared with input provided by Isanti County Board of Commissioners, members of the Water Plan Task Force, the general public, and correspondences with neighboring watershed agencies. Isanti County Board of Commissioners District 1 Dave Oslund District 2 Terry Turnquist District 3 Greg Anderson District 4 Mike Warring District 5 Susan Morris Isanti County Water Plan Task Force Al Koczur Isanti SWCD Board Member Bonnie Finnerty MPCA technical support Jason Weinerman BWSR Board Conservationist Dennis Haubenschild Citizen Josh Bork NRCS technical support Mary Pieper Citizen Kriste Ericsson Isanti County Environmental Coalition Member Todd Schwab City of Cambridge Public Works Director Marshall Lind City of Braham Code Enforcement/Inspector Greg Anderson County Commissioner Valerie Marty-Anderson Citizen Tom Anderson Citizen-Mediator Craig Wills DNR Area Hydrologist Rachel Olmanson MPCA Watershed Project Manager Josi Wood City of Isanti Parks and Assistant Public Works Director Tiffany Determan Isanti SWCD Manager and technical support Holly Nelson Deputy Zoning Administrator and advisory support Trina Bergloff Zoning Administrator and advisory support Darrick Wotachek Zoning Wetland Specialist/Water Planner Isanti County Priority Concerns Scoping Document Support Todd Kulaf Isanti SWCD Conservation Technician Jamie Schurbon Anoka Conservation District Watershed Projects Manager Holly Nelson Deputy Zoning Administrator 5 ISANTI COUNTY LOCAL WATER MANAGEMENT PLAN DRAFT 2018-2028 IV. Executive Summary The purpose of the Local Water Management Plan (LWMP) is to identify existing and potential water resource issues, create an implementation strategy for protection and foster positive land use management and sustainable development within the entire County in a way that is respectful of the resources. The LWMP is administered by the Isanti County Zoning Office with assistance from the Isanti Soil and Water Conservation District (ISWCD). Both agencies are committed to providing landowners with applicable information to assist them in making wise choices in land management and collectively protect the natural resources of Isanti County. Isanti County is aware that many local, state and federal agencies are involved with water resource restoration and protection. The intent of this plan is to reduce the duplication and eliminate gaps in implementation strategies aimed at the common goal of protecting, preserving and improving water resources in Isanti County. Additionally, the County is aware that there are several existing plans that address water resources within the county (i.e. Watershed Restoration and Protection Strategies/WRAPS and Storm Water Retrofit Assessments/SRAs). These existing plans will incorporate water quality monitoring and assessment, watershed analysis, civic engagement, planning, implementation, and measurable