OVERALL PLAN Bois de Sioux Watershed District Prepared by: HDR Engineering, Inc. 6190 Golden Hills Drive Minneapolis, Minnesota 55416 May 2003 TABLE OF CONTENTS EXECUTIVE SUMMARY..................................................................................................................1 MISSION STATEMENT.....................................................................................................................3 ACKNOWLEDGEMENTS.................................................................................................................4 INTRODUCTION................................................................................................................................8 Purpose and General Objectives....................................................................................................8 PART I. DESCRIPTION OF THE DISTRICT....................................................................10 Location and Size ........................................................................................................................10 Geology .......................................................................................................................................10 Topography..................................................................................................................................14 Soils .............................................................................................................................................14 Climate.........................................................................................................................................18 Population....................................................................................................................................18 Landuse........................................................................................................................................18 Fish and Wildlife .........................................................................................................................19 WATER RESOURCES .................................................................................................................19 Surface Waters.............................................................................................................................19 Streams....................................................................................................................................19 Lakes .......................................................................................................................................22 Wetlands..................................................................................................................................22 Drainage Systems....................................................................................................................24 Water Management Structures ................................................................................................24 Ground Water ..............................................................................................................................28 Unique Water and Land Related Resources ................................................................................29 Outstanding Resource Value Waters (ORVW).......................................................................29 Rare and Endangered Species .................................................................................................29 Critical Vegetated Habitats .....................................................................................................29 Water Use ....................................................................................................................................29 Surface Water..........................................................................................................................29 Ground Water..........................................................................................................................29 Inventory of Public Water Suppliers .......................................................................................31 Inventory of Municipal Wastewater Treatment Systems ........................................................31 Existing Water Management Plans and Programs.......................................................................31 PART II. OVERALL WATERSHED GOALS AND OBJECTIVES ..................................32 Overall Water Quantity Vision....................................................................................................32 Effect of Flood Timing............................................................................................................33 Recommended Projects to Reduce Flood Flows .....................................................................35 Impoundments.........................................................................................................................35 Wetland Restorations ..............................................................................................................36 Culvert Sizing..........................................................................................................................36 Landuse Change ......................................................................................................................37 Other Projects to Reduce Flood Damages...............................................................................37 Drainage and Channel Improvements .....................................................................................37 Levees and Dikes.....................................................................................................................37 Environmental Considerations ................................................................................................38 11177-001-164 Page i May 23, 2003 Overall Watershed Goals and Objectives ....................................................................................39 A. Water Quantity...............................................................................................................39 B. Water Quality.................................................................................................................41 C. Erosion and Sedimentation.............................................................................................43 D. Fish, Wildlife and Other Natural Resources...................................................................45 E. Water Based Recreational Activities ..............................................................................48 PART III. SUBWATERSHED IMPLEMENTATION PLANS.........................................51 Introduction..................................................................................................................................51 BOIS de SIOUX..............................................................................................................................51 Description of Watershed ............................................................................................................51 Watershed Setting....................................................................................................................51 Existing Conditions, Related Problems and Opportunities .....................................................51 EAST BRANCH TWELVE MILE CREEK................................................................................56 Description of Watershed ............................................................................................................56 Watershed Setting....................................................................................................................56 Existing Conditions, Related Problems and Opportunities .....................................................56 FIVE MILE CREEK .....................................................................................................................60 Description of Watershed ............................................................................................................60 Watershed Setting....................................................................................................................60 Existing Conditions, Related Problems and Opportunities .....................................................60 JUDICIAL DITCH 14 ...................................................................................................................64 Description of Watershed ............................................................................................................64 Watershed Setting....................................................................................................................64 Existing Conditions, Related Problems and Opportunities .....................................................64 LAKE TRAVERSE........................................................................................................................68 Description of Watershed ............................................................................................................68 Watershed Setting....................................................................................................................68 Existing Conditions, Related Problems and Opportunities .....................................................68 MUSTINKA RIVER......................................................................................................................72